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null-ptr deref found in netfs code

PATCH New Shyam Prasad N 3 participants 19 messages Dec 2, 2024 – Jan 25, 2025

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#0 lore raw

Found this null-ptr dereference in netfs code with 6.13-rc1.

Is it a known issue?

[Mon Dec  2 01:57:27 2024] ------------[ cut here ]------------
[Mon Dec  2 01:57:27 2024] WARNING: CPU: 1 PID: 152 at
fs/netfs/read_collect.c:110 netfs_consume_read_data.isra.0+0x715/0xbb0
[netfs]
[Mon Dec  2 01:57:27 2024] Modules linked in: cmac nls_utf8 cifs

cifs_arc4 nls_ucs2_utils cifs_md4 netfs qrtr cfg80211 8021q garp mrp stp llc xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_owner xt_tcpudp nft_compat nf_tables mlx5_ib ib_uverbs macsec binfmt_misc ib_core intel_rapl_msr intel_rapl_common intel_uncore_frequency_common isst_if_common nls_iso8859_1 mlx5_core btrfs mlxfw blake2b_generic psample xor tls skx_edac_common crct10dif_pclmul crc32_pclmul raid6_pq polyval_clmulni polyval_generic libcrc32c joydev ghash_clmulni_intel mac_hid sha256_ssse3 sha1_ssse3 serio_raw hid_generic aesni_intel crypto_simd cryptd hyperv_drm hid_hyperv rapl hyperv_fb vmgenid hid hv_netvsc hyperv_keyboard sch_fq_codel dm_multipath msr nvme_fabrics efi_pstore nfnetlink ip_tables x_tables autofs4

[Mon Dec  2 01:57:27 2024] CPU: 1 UID: 0 PID: 152 Comm: kworker/1:1
Not tainted 6.13.0-rc1-mainline #9
[Mon Dec  2 01:57:27 2024] Hardware name: Microsoft Corporation
Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1
08/23/2024
[Mon Dec  2 01:57:27 2024] Workqueue: cifsiod smb2_readv_worker [cifs]
[Mon Dec  2 01:57:27 2024] RIP:
0010:netfs_consume_read_data.isra.0+0x715/0xbb0 [netfs]
[Mon Dec  2 01:57:27 2024] Code: 8b 78 08 ba 1e 00 00 00 4c 89 e6 e8
75 a8 ff ff e9 d7 fc ff ff 48 8b 45 90 4c 89 80 48 02 00 00 0f 1f 44
00 00 e9 c2 fb ff ff <0f> 0b 48 8b 43 70 48 8b 75 90 8b 7d 9c 0f b7 93
96 00 00 00 8b b6
[Mon Dec  2 01:57:27 2024] RSP: 0018:ffffb2f6805dfda0 EFLAGS: 00010246
[Mon Dec  2 01:57:27 2024] RAX: ffff969a23360c00 RBX: ffff969a18da72c0
RCX: 0000000012800000
[Mon Dec  2 01:57:27 2024] RDX: 0000000012a00000 RSI: ffff969a23360c00
RDI: ffffffff9b609a30
[Mon Dec  2 01:57:27 2024] RBP: ffffb2f6805dfe10 R08: 0000000000000020
R09: 0000000000200000
[Mon Dec  2 01:57:27 2024] R10: 0000000000000001 R11: 0000000000000005
R12: 0000000000000000
[Mon Dec  2 01:57:27 2024] R13: ffff969a232b97e8 R14: 0000000000200000
R15: 0000000000000002
[Mon Dec  2 01:57:27 2024] FS:  0000000000000000(0000)
GS:ffff96bc53480000(0000) knlGS:0000000000000000
[Mon Dec  2 01:57:27 2024] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Mon Dec  2 01:57:27 2024] CR2: 000079a46e3fe000 CR3: 000000012cfda002
CR4: 00000000003706f0
[Mon Dec  2 01:57:27 2024] DR0: 0000000000000000 DR1: 0000000000000000
DR2: 0000000000000000
[Mon Dec  2 01:57:27 2024] DR3: 0000000000000000 DR6: 00000000fffe0ff0
DR7: 0000000000000400
[Mon Dec  2 01:57:27 2024] Call Trace:
[Mon Dec  2 01:57:27 2024]  <TASK>
[Mon Dec  2 01:57:27 2024]  ? show_regs+0x64/0x70
[Mon Dec  2 01:57:27 2024]  ? __warn+0x89/0x120
[Mon Dec  2 01:57:27 2024]  ? netfs_consume_read_data.isra.0+0x715/0xbb0 [netfs]
[Mon Dec  2 01:57:27 2024]  ? report_bug+0x15d/0x180
[Mon Dec  2 01:57:27 2024]  ? handle_bug+0x5b/0x90
[Mon Dec  2 01:57:27 2024]  ? exc_invalid_op+0x18/0x70
[Mon Dec  2 01:57:27 2024]  ? asm_exc_invalid_op+0x1b/0x20
[Mon Dec  2 01:57:27 2024]  ? netfs_consume_read_data.isra.0+0x715/0xbb0 [netfs]
[Mon Dec  2 01:57:27 2024]  ? __schedule+0x401/0x16e0
[Mon Dec  2 01:57:27 2024]  netfs_read_subreq_terminated+0x2b2/0x390 [netfs]
[Mon Dec  2 01:57:27 2024]  smb2_readv_worker+0x1a/0x20 [cifs]
[Mon Dec  2 01:57:27 2024]  process_one_work+0x170/0x330
[Mon Dec  2 01:57:27 2024]  worker_thread+0x2ce/0x400
[Mon Dec  2 01:57:27 2024]  ? _raw_spin_unlock_irqrestore+0xe/0x20
[Mon Dec  2 01:57:27 2024]  ? __pfx_worker_thread+0x10/0x10
[Mon Dec  2 01:57:27 2024]  kthread+0xd4/0x100
[Mon Dec  2 01:57:27 2024]  ? __pfx_kthread+0x10/0x10
[Mon Dec  2 01:57:27 2024]  ret_from_fork+0x3d/0x60
[Mon Dec  2 01:57:27 2024]  ? __pfx_kthread+0x10/0x10
[Mon Dec  2 01:57:27 2024]  ret_from_fork_asm+0x1a/0x30
[Mon Dec  2 01:57:27 2024]  </TASK>
[Mon Dec  2 01:57:27 2024] ---[ end trace 0000000000000000 ]---
[Mon Dec  2 01:57:27 2024] netfs: R=00002827[3] s=12800000-12bfffff
ctl=200000/400000/400000 sl=2
[Mon Dec  2 01:57:27 2024] netfs: folioq: orders=09090909
[Mon Dec  2 01:57:27 2024] BUG: kernel NULL pointer dereference,
address: 0000000000000000
[Mon Dec  2 01:57:27 2024] #PF: supervisor write access in kernel mode
[Mon Dec  2 01:57:27 2024] #PF: error_code(0x0002) - not-present page
[Mon Dec  2 01:57:27 2024] PGD 0 P4D 0
[Mon Dec  2 01:57:27 2024] Oops: Oops: 0002 [#1] SMP PTI
[Mon Dec  2 01:57:27 2024] CPU: 1 UID: 0 PID: 152 Comm: kworker/1:1
Tainted: G        W          6.13.0-rc1-mainline #9
[Mon Dec  2 01:57:27 2024] Tainted: [W]=WARN
[Mon Dec  2 01:57:27 2024] Hardware name: Microsoft Corporation
Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1
08/23/2024
[Mon Dec  2 01:57:27 2024] Workqueue: cifsiod smb2_readv_worker [cifs]
[Mon Dec  2 01:57:27 2024] RIP:
0010:netfs_consume_read_data.isra.0+0x35d/0xbb0 [netfs]
[Mon Dec  2 01:57:27 2024] Code: 41 5f 5d c3 cc cc cc cc 44 8b 7d 9c
48 89 f0 48 2b 43 60 48 89 43 78 41 83 ff 1e 0f 87 16 08 00 00 48 8b
45 a0 4e 8b 64 f8 08 <f0> 41 80 0c 24 08 48 8b 45 90 48 8b 80 58 02 00
00 a9 00 00 00 80
[Mon Dec  2 01:57:27 2024] RSP: 0018:ffffb2f6805dfda0 EFLAGS: 00010297
[Mon Dec  2 01:57:27 2024] RAX: ffff969a23360c00 RBX: ffff969a18da72c0
RCX: 0000000000200000
[Mon Dec  2 01:57:27 2024] RDX: 0000000000000000 RSI: 0000000012c00000
RDI: ffff96bc534a0a40
[Mon Dec  2 01:57:27 2024] RBP: ffffb2f6805dfe10 R08: 0000000000000000
R09: 0000000000000001
[Mon Dec  2 01:57:27 2024] R10: ffffb2f681b42000 R11: 0000000012a00000
R12: 0000000000000000
[Mon Dec  2 01:57:27 2024] R13: ffff969a232b97e8 R14: 0000000000200000
R15: 0000000000000002
[Mon Dec  2 01:57:27 2024] FS:  0000000000000000(0000)
GS:ffff96bc53480000(0000) knlGS:0000000000000000
[Mon Dec  2 01:57:27 2024] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Mon Dec  2 01:57:27 2024] CR2: 0000000000000000 CR3: 000000012cfda002
CR4: 00000000003706f0
[Mon Dec  2 01:57:27 2024] DR0: 0000000000000000 DR1: 0000000000000000
DR2: 0000000000000000
[Mon Dec  2 01:57:27 2024] DR3: 0000000000000000 DR6: 00000000fffe0ff0
DR7: 0000000000000400
[Mon Dec  2 01:57:27 2024] Call Trace:
[Mon Dec  2 01:57:27 2024]  <TASK>
[Mon Dec  2 01:57:27 2024]  ? show_regs+0x64/0x70
[Mon Dec  2 01:57:27 2024]  ? __die+0x24/0x70
[Mon Dec  2 01:57:27 2024]  ? page_fault_oops+0x290/0x5b0
[Mon Dec  2 01:57:27 2024]  ? do_user_addr_fault+0x448/0x800
[Mon Dec  2 01:57:27 2024]  ? irq_work_queue+0x28/0x50
[Mon Dec  2 01:57:27 2024]  ? exc_page_fault+0x7a/0x160
[Mon Dec  2 01:57:27 2024]  ? asm_exc_page_fault+0x27/0x30
[Mon Dec  2 01:57:27 2024]  ? netfs_consume_read_data.isra.0+0x35d/0xbb0 [netfs]
[Mon Dec  2 01:57:27 2024]  ? __schedule+0x401/0x16e0
[Mon Dec  2 01:57:27 2024]  netfs_read_subreq_terminated+0x2b2/0x390 [netfs]
[Mon Dec  2 01:57:27 2024]  smb2_readv_worker+0x1a/0x20 [cifs]
[Mon Dec  2 01:57:27 2024]  process_one_work+0x170/0x330
[Mon Dec  2 01:57:27 2024]  worker_thread+0x2ce/0x400
[Mon Dec  2 01:57:27 2024]  ? _raw_spin_unlock_irqrestore+0xe/0x20
[Mon Dec  2 01:57:27 2024]  ? __pfx_worker_thread+0x10/0x10
[Mon Dec  2 01:57:27 2024]  kthread+0xd4/0x100
[Mon Dec  2 01:57:27 2024]  ? __pfx_kthread+0x10/0x10
[Mon Dec  2 01:57:27 2024]  ret_from_fork+0x3d/0x60
[Mon Dec  2 01:57:27 2024]  ? __pfx_kthread+0x10/0x10
[Mon Dec  2 01:57:27 2024]  ret_from_fork_asm+0x1a/0x30
[Mon Dec  2 01:57:27 2024]  </TASK>
[Mon Dec  2 01:57:27 2024] Modules linked in: cmac nls_utf8 cifs

cifs_arc4 nls_ucs2_utils cifs_md4 netfs qrtr cfg80211 8021q garp mrp stp llc xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_owner xt_tcpudp nft_compat nf_tables mlx5_ib ib_uverbs macsec binfmt_misc ib_core intel_rapl_msr intel_rapl_common intel_uncore_frequency_common isst_if_common nls_iso8859_1 mlx5_core btrfs mlxfw blake2b_generic psample xor tls skx_edac_common crct10dif_pclmul crc32_pclmul raid6_pq polyval_clmulni polyval_generic libcrc32c joydev ghash_clmulni_intel mac_hid sha256_ssse3 sha1_ssse3 serio_raw hid_generic aesni_intel crypto_simd cryptd hyperv_drm hid_hyperv rapl hyperv_fb vmgenid hid hv_netvsc hyperv_keyboard sch_fq_codel dm_multipath msr nvme_fabrics efi_pstore nfnetlink ip_tables x_tables autofs4

[Mon Dec  2 01:57:27 2024] CR2: 0000000000000000
[Mon Dec  2 01:57:27 2024] ---[ end trace 0000000000000000 ]---
[Mon Dec  2 01:57:27 2024] RIP:
0010:netfs_consume_read_data.isra.0+0x35d/0xbb0 [netfs]
[Mon Dec  2 01:57:27 2024] Code: 41 5f 5d c3 cc cc cc cc 44 8b 7d 9c
48 89 f0 48 2b 43 60 48 89 43 78 41 83 ff 1e 0f 87 16 08 00 00 48 8b
45 a0 4e 8b 64 f8 08 <f0> 41 80 0c 24 08 48 8b 45 90 48 8b 80 58 02 00
00 a9 00 00 00 80
[Mon Dec  2 01:57:27 2024] RSP: 0018:ffffb2f6805dfda0 EFLAGS: 00010297
[Mon Dec  2 01:57:27 2024] RAX: ffff969a23360c00 RBX: ffff969a18da72c0
RCX: 0000000000200000
[Mon Dec  2 01:57:27 2024] RDX: 0000000000000000 RSI: 0000000012c00000
RDI: ffff96bc534a0a40
[Mon Dec  2 01:57:27 2024] RBP: ffffb2f6805dfe10 R08: 0000000000000000
R09: 0000000000000001
[Mon Dec  2 01:57:27 2024] R10: ffffb2f681b42000 R11: 0000000012a00000
R12: 0000000000000000
[Mon Dec  2 01:57:27 2024] R13: ffff969a232b97e8 R14: 0000000000200000
R15: 0000000000000002
[Mon Dec  2 01:57:27 2024] FS:  0000000000000000(0000)
GS:ffff96bc53480000(0000) knlGS:0000000000000000
[Mon Dec  2 01:57:27 2024] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Mon Dec  2 01:57:27 2024] CR2: 0000000000000000 CR3: 000000012cfda002
CR4: 00000000003706f0
[Mon Dec  2 01:57:27 2024] DR0: 0000000000000000 DR1: 0000000000000000
DR2: 0000000000000000
[Mon Dec  2 01:57:27 2024] DR3: 0000000000000000 DR6: 00000000fffe0ff0

DR7: 0000000000000400

Signature · 2 lines
Regards,
Shyam
#1 lore raw
Quoted 183 lines · Shyam Prasad N

Found this null-ptr dereference in netfs code with 6.13-rc1.

Is it a known issue?

[Mon Dec  2 01:57:27 2024] ------------[ cut here ]------------
[Mon Dec  2 01:57:27 2024] WARNING: CPU: 1 PID: 152 at
fs/netfs/read_collect.c:110 netfs_consume_read_data.isra.0+0x715/0xbb0
[netfs]
[Mon Dec  2 01:57:27 2024] Modules linked in: cmac nls_utf8 cifs

cifs_arc4 nls_ucs2_utils cifs_md4 netfs qrtr cfg80211 8021q garp mrp stp llc xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_owner xt_tcpudp nft_compat nf_tables mlx5_ib ib_uverbs macsec binfmt_misc ib_core intel_rapl_msr intel_rapl_common intel_uncore_frequency_common isst_if_common nls_iso8859_1 mlx5_core btrfs mlxfw blake2b_generic psample xor tls skx_edac_common crct10dif_pclmul crc32_pclmul raid6_pq polyval_clmulni polyval_generic libcrc32c joydev ghash_clmulni_intel mac_hid sha256_ssse3 sha1_ssse3 serio_raw hid_generic aesni_intel crypto_simd cryptd hyperv_drm hid_hyperv rapl hyperv_fb vmgenid hid hv_netvsc hyperv_keyboard sch_fq_codel dm_multipath msr nvme_fabrics efi_pstore nfnetlink ip_tables x_tables autofs4

[Mon Dec  2 01:57:27 2024] CPU: 1 UID: 0 PID: 152 Comm: kworker/1:1
Not tainted 6.13.0-rc1-mainline #9
[Mon Dec  2 01:57:27 2024] Hardware name: Microsoft Corporation
Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1
08/23/2024
[Mon Dec  2 01:57:27 2024] Workqueue: cifsiod smb2_readv_worker [cifs]
[Mon Dec  2 01:57:27 2024] RIP:
0010:netfs_consume_read_data.isra.0+0x715/0xbb0 [netfs]
[Mon Dec  2 01:57:27 2024] Code: 8b 78 08 ba 1e 00 00 00 4c 89 e6 e8
75 a8 ff ff e9 d7 fc ff ff 48 8b 45 90 4c 89 80 48 02 00 00 0f 1f 44
00 00 e9 c2 fb ff ff <0f> 0b 48 8b 43 70 48 8b 75 90 8b 7d 9c 0f b7 93
96 00 00 00 8b b6
[Mon Dec  2 01:57:27 2024] RSP: 0018:ffffb2f6805dfda0 EFLAGS: 00010246
[Mon Dec  2 01:57:27 2024] RAX: ffff969a23360c00 RBX: ffff969a18da72c0
RCX: 0000000012800000
[Mon Dec  2 01:57:27 2024] RDX: 0000000012a00000 RSI: ffff969a23360c00
RDI: ffffffff9b609a30
[Mon Dec  2 01:57:27 2024] RBP: ffffb2f6805dfe10 R08: 0000000000000020
R09: 0000000000200000
[Mon Dec  2 01:57:27 2024] R10: 0000000000000001 R11: 0000000000000005
R12: 0000000000000000
[Mon Dec  2 01:57:27 2024] R13: ffff969a232b97e8 R14: 0000000000200000
R15: 0000000000000002
[Mon Dec  2 01:57:27 2024] FS:  0000000000000000(0000)
GS:ffff96bc53480000(0000) knlGS:0000000000000000
[Mon Dec  2 01:57:27 2024] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Mon Dec  2 01:57:27 2024] CR2: 000079a46e3fe000 CR3: 000000012cfda002
CR4: 00000000003706f0
[Mon Dec  2 01:57:27 2024] DR0: 0000000000000000 DR1: 0000000000000000
DR2: 0000000000000000
[Mon Dec  2 01:57:27 2024] DR3: 0000000000000000 DR6: 00000000fffe0ff0
DR7: 0000000000000400
[Mon Dec  2 01:57:27 2024] Call Trace:
[Mon Dec  2 01:57:27 2024]  <TASK>
[Mon Dec  2 01:57:27 2024]  ? show_regs+0x64/0x70
[Mon Dec  2 01:57:27 2024]  ? __warn+0x89/0x120
[Mon Dec  2 01:57:27 2024]  ? netfs_consume_read_data.isra.0+0x715/0xbb0 [netfs]
[Mon Dec  2 01:57:27 2024]  ? report_bug+0x15d/0x180
[Mon Dec  2 01:57:27 2024]  ? handle_bug+0x5b/0x90
[Mon Dec  2 01:57:27 2024]  ? exc_invalid_op+0x18/0x70
[Mon Dec  2 01:57:27 2024]  ? asm_exc_invalid_op+0x1b/0x20
[Mon Dec  2 01:57:27 2024]  ? netfs_consume_read_data.isra.0+0x715/0xbb0 [netfs]
[Mon Dec  2 01:57:27 2024]  ? __schedule+0x401/0x16e0
[Mon Dec  2 01:57:27 2024]  netfs_read_subreq_terminated+0x2b2/0x390 [netfs]
[Mon Dec  2 01:57:27 2024]  smb2_readv_worker+0x1a/0x20 [cifs]
[Mon Dec  2 01:57:27 2024]  process_one_work+0x170/0x330
[Mon Dec  2 01:57:27 2024]  worker_thread+0x2ce/0x400
[Mon Dec  2 01:57:27 2024]  ? _raw_spin_unlock_irqrestore+0xe/0x20
[Mon Dec  2 01:57:27 2024]  ? __pfx_worker_thread+0x10/0x10
[Mon Dec  2 01:57:27 2024]  kthread+0xd4/0x100
[Mon Dec  2 01:57:27 2024]  ? __pfx_kthread+0x10/0x10
[Mon Dec  2 01:57:27 2024]  ret_from_fork+0x3d/0x60
[Mon Dec  2 01:57:27 2024]  ? __pfx_kthread+0x10/0x10
[Mon Dec  2 01:57:27 2024]  ret_from_fork_asm+0x1a/0x30
[Mon Dec  2 01:57:27 2024]  </TASK>
[Mon Dec  2 01:57:27 2024] ---[ end trace 0000000000000000 ]---
[Mon Dec  2 01:57:27 2024] netfs: R=00002827[3] s=12800000-12bfffff
ctl=200000/400000/400000 sl=2
[Mon Dec  2 01:57:27 2024] netfs: folioq: orders=09090909
[Mon Dec  2 01:57:27 2024] BUG: kernel NULL pointer dereference,
address: 0000000000000000
[Mon Dec  2 01:57:27 2024] #PF: supervisor write access in kernel mode
[Mon Dec  2 01:57:27 2024] #PF: error_code(0x0002) - not-present page
[Mon Dec  2 01:57:27 2024] PGD 0 P4D 0
[Mon Dec  2 01:57:27 2024] Oops: Oops: 0002 [#1] SMP PTI
[Mon Dec  2 01:57:27 2024] CPU: 1 UID: 0 PID: 152 Comm: kworker/1:1
Tainted: G        W          6.13.0-rc1-mainline #9
[Mon Dec  2 01:57:27 2024] Tainted: [W]=WARN
[Mon Dec  2 01:57:27 2024] Hardware name: Microsoft Corporation
Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1
08/23/2024
[Mon Dec  2 01:57:27 2024] Workqueue: cifsiod smb2_readv_worker [cifs]
[Mon Dec  2 01:57:27 2024] RIP:
0010:netfs_consume_read_data.isra.0+0x35d/0xbb0 [netfs]
[Mon Dec  2 01:57:27 2024] Code: 41 5f 5d c3 cc cc cc cc 44 8b 7d 9c
48 89 f0 48 2b 43 60 48 89 43 78 41 83 ff 1e 0f 87 16 08 00 00 48 8b
45 a0 4e 8b 64 f8 08 <f0> 41 80 0c 24 08 48 8b 45 90 48 8b 80 58 02 00
00 a9 00 00 00 80
[Mon Dec  2 01:57:27 2024] RSP: 0018:ffffb2f6805dfda0 EFLAGS: 00010297
[Mon Dec  2 01:57:27 2024] RAX: ffff969a23360c00 RBX: ffff969a18da72c0
RCX: 0000000000200000
[Mon Dec  2 01:57:27 2024] RDX: 0000000000000000 RSI: 0000000012c00000
RDI: ffff96bc534a0a40
[Mon Dec  2 01:57:27 2024] RBP: ffffb2f6805dfe10 R08: 0000000000000000
R09: 0000000000000001
[Mon Dec  2 01:57:27 2024] R10: ffffb2f681b42000 R11: 0000000012a00000
R12: 0000000000000000
[Mon Dec  2 01:57:27 2024] R13: ffff969a232b97e8 R14: 0000000000200000
R15: 0000000000000002
[Mon Dec  2 01:57:27 2024] FS:  0000000000000000(0000)
GS:ffff96bc53480000(0000) knlGS:0000000000000000
[Mon Dec  2 01:57:27 2024] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Mon Dec  2 01:57:27 2024] CR2: 0000000000000000 CR3: 000000012cfda002
CR4: 00000000003706f0
[Mon Dec  2 01:57:27 2024] DR0: 0000000000000000 DR1: 0000000000000000
DR2: 0000000000000000
[Mon Dec  2 01:57:27 2024] DR3: 0000000000000000 DR6: 00000000fffe0ff0
DR7: 0000000000000400
[Mon Dec  2 01:57:27 2024] Call Trace:
[Mon Dec  2 01:57:27 2024]  <TASK>
[Mon Dec  2 01:57:27 2024]  ? show_regs+0x64/0x70
[Mon Dec  2 01:57:27 2024]  ? __die+0x24/0x70
[Mon Dec  2 01:57:27 2024]  ? page_fault_oops+0x290/0x5b0
[Mon Dec  2 01:57:27 2024]  ? do_user_addr_fault+0x448/0x800
[Mon Dec  2 01:57:27 2024]  ? irq_work_queue+0x28/0x50
[Mon Dec  2 01:57:27 2024]  ? exc_page_fault+0x7a/0x160
[Mon Dec  2 01:57:27 2024]  ? asm_exc_page_fault+0x27/0x30
[Mon Dec  2 01:57:27 2024]  ? netfs_consume_read_data.isra.0+0x35d/0xbb0 [netfs]
[Mon Dec  2 01:57:27 2024]  ? __schedule+0x401/0x16e0
[Mon Dec  2 01:57:27 2024]  netfs_read_subreq_terminated+0x2b2/0x390 [netfs]
[Mon Dec  2 01:57:27 2024]  smb2_readv_worker+0x1a/0x20 [cifs]
[Mon Dec  2 01:57:27 2024]  process_one_work+0x170/0x330
[Mon Dec  2 01:57:27 2024]  worker_thread+0x2ce/0x400
[Mon Dec  2 01:57:27 2024]  ? _raw_spin_unlock_irqrestore+0xe/0x20
[Mon Dec  2 01:57:27 2024]  ? __pfx_worker_thread+0x10/0x10
[Mon Dec  2 01:57:27 2024]  kthread+0xd4/0x100
[Mon Dec  2 01:57:27 2024]  ? __pfx_kthread+0x10/0x10
[Mon Dec  2 01:57:27 2024]  ret_from_fork+0x3d/0x60
[Mon Dec  2 01:57:27 2024]  ? __pfx_kthread+0x10/0x10
[Mon Dec  2 01:57:27 2024]  ret_from_fork_asm+0x1a/0x30
[Mon Dec  2 01:57:27 2024]  </TASK>
[Mon Dec  2 01:57:27 2024] Modules linked in: cmac nls_utf8 cifs

cifs_arc4 nls_ucs2_utils cifs_md4 netfs qrtr cfg80211 8021q garp mrp stp llc xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_owner xt_tcpudp nft_compat nf_tables mlx5_ib ib_uverbs macsec binfmt_misc ib_core intel_rapl_msr intel_rapl_common intel_uncore_frequency_common isst_if_common nls_iso8859_1 mlx5_core btrfs mlxfw blake2b_generic psample xor tls skx_edac_common crct10dif_pclmul crc32_pclmul raid6_pq polyval_clmulni polyval_generic libcrc32c joydev ghash_clmulni_intel mac_hid sha256_ssse3 sha1_ssse3 serio_raw hid_generic aesni_intel crypto_simd cryptd hyperv_drm hid_hyperv rapl hyperv_fb vmgenid hid hv_netvsc hyperv_keyboard sch_fq_codel dm_multipath msr nvme_fabrics efi_pstore nfnetlink ip_tables x_tables autofs4

[Mon Dec  2 01:57:27 2024] CR2: 0000000000000000
[Mon Dec  2 01:57:27 2024] ---[ end trace 0000000000000000 ]---
[Mon Dec  2 01:57:27 2024] RIP:
0010:netfs_consume_read_data.isra.0+0x35d/0xbb0 [netfs]
[Mon Dec  2 01:57:27 2024] Code: 41 5f 5d c3 cc cc cc cc 44 8b 7d 9c
48 89 f0 48 2b 43 60 48 89 43 78 41 83 ff 1e 0f 87 16 08 00 00 48 8b
45 a0 4e 8b 64 f8 08 <f0> 41 80 0c 24 08 48 8b 45 90 48 8b 80 58 02 00
00 a9 00 00 00 80
[Mon Dec  2 01:57:27 2024] RSP: 0018:ffffb2f6805dfda0 EFLAGS: 00010297
[Mon Dec  2 01:57:27 2024] RAX: ffff969a23360c00 RBX: ffff969a18da72c0
RCX: 0000000000200000
[Mon Dec  2 01:57:27 2024] RDX: 0000000000000000 RSI: 0000000012c00000
RDI: ffff96bc534a0a40
[Mon Dec  2 01:57:27 2024] RBP: ffffb2f6805dfe10 R08: 0000000000000000
R09: 0000000000000001
[Mon Dec  2 01:57:27 2024] R10: ffffb2f681b42000 R11: 0000000012a00000
R12: 0000000000000000
[Mon Dec  2 01:57:27 2024] R13: ffff969a232b97e8 R14: 0000000000200000
R15: 0000000000000002
[Mon Dec  2 01:57:27 2024] FS:  0000000000000000(0000)
GS:ffff96bc53480000(0000) knlGS:0000000000000000
[Mon Dec  2 01:57:27 2024] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Mon Dec  2 01:57:27 2024] CR2: 0000000000000000 CR3: 000000012cfda002
CR4: 00000000003706f0
[Mon Dec  2 01:57:27 2024] DR0: 0000000000000000 DR1: 0000000000000000
DR2: 0000000000000000
[Mon Dec  2 01:57:27 2024] DR3: 0000000000000000 DR6: 00000000fffe0ff0
Quoted 6 lines

DR7: 0000000000000400

--
Regards,
Shyam

This issue is consistently reproducible for me from at least 6.12. It shows up when several reads are in flight in parallel.

Signature · 2 lines
Regards,
Shyam
maintainer
#2 lore raw
Quoted 2 lines · Shyam Prasad N

This issue is consistently reproducible for me from at least 6.12. It shows up when several reads are in flight in parallel.

Doing what to what sort of server?

David

maintainer
#3 lore raw
In reply to Shyam Prasad N
Quoted 2 lines · Shyam Prasad N

This issue is consistently reproducible for me from at least 6.12. It shows up when several reads are in flight in parallel.

Can you get some tracing?

echo 1 >/sys/kernel/debug/tracing/events/netfs/netfs_read/enable echo 1 >/sys/kernel/debug/tracing/events/netfs/netfs_rreq/enable echo 1 >/sys/kernel/debug/tracing/events/netfs/netfs_sreq/enable echo 1 >/sys/kernel/debug/tracing/events/netfs/netfs_failure/enable echo 1 >/sys/kernel/debug/tracing/events/netfs/netfs_write_iter/enable echo 1 >/sys/kernel/debug/tracing/events/netfs/netfs_write/enable

Thanks,
David

#4 lore raw
Quoted 15 lines · David Howells
Quoted 2 lines · Shyam Prasad N

This issue is consistently reproducible for me from at least 6.12. It shows up when several reads are in flight in parallel.

Can you get some tracing?

echo 1 >/sys/kernel/debug/tracing/events/netfs/netfs_read/enable echo 1 >/sys/kernel/debug/tracing/events/netfs/netfs_rreq/enable echo 1 >/sys/kernel/debug/tracing/events/netfs/netfs_sreq/enable echo 1 >/sys/kernel/debug/tracing/events/netfs/netfs_failure/enable echo 1 >/sys/kernel/debug/tracing/events/netfs/netfs_write_iter/enable echo 1 >/sys/kernel/debug/tracing/events/netfs/netfs_write/enable

Quoted 3 lines

Thanks,
David

The server is an Azure SMB server. Client is in an Azure VM too. Doing large sequential reads. i.e. dd from a large file on the SMB share to local file.
Attaching the trace capture.

Signature · 2 lines
Regards,
Shyam

# tracer: nop
#
# entries-in-buffer/entries-written: 203954/217951 #P:20
#
# _-----=> irqs-off/BH-disabled
# / _----=> need-resched

#                              | / _---=> hardirq/softirq
#                              || / _--=> preempt-depth
#                              ||| / _-=> migrate-disable
#                              |||| /     delay
#           TASK-PID     CPU#  |||||  TIMESTAMP  FUNCTION
#              | |         |   |||||     |         |
   kworker/u80:1-139     [000] .....   822.208903: netfs_sreq: R=00000001[1] DOWN IO    f=00 s=0 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.208931: netfs_sreq: R=00000001[1] DOWN TERM  f=00 s=0 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.208932: netfs_rreq: R=00000001 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   822.208938: netfs_rreq: R=00000001 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.208943: netfs_rreq: R=00000001 DR DONE    f=00
     kworker/0:1-9       [000] .....   822.208943: netfs_sreq_ref: R=00000001[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.208944: netfs_sreq_ref: R=00000001[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   822.208944: netfs_sreq: R=00000001[1] DOWN FREE  f=00 s=0 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.208945: netfs_rreq_ref: R=00000001 PUT SUBREQ  r=1
   kworker/u80:1-139     [000] .....   822.216247: netfs_sreq: R=00000002[1] DOWN IO    f=00 s=100000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.216287: netfs_sreq: R=00000002[1] DOWN TERM  f=00 s=100000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.216287: netfs_rreq: R=00000002 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   822.216291: netfs_rreq: R=00000002 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.216295: netfs_rreq: R=00000002 DR DONE    f=00
     kworker/0:1-9       [000] .....   822.216296: netfs_sreq_ref: R=00000002[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.216296: netfs_sreq_ref: R=00000002[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   822.216296: netfs_sreq: R=00000002[1] DOWN FREE  f=00 s=100000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.216297: netfs_rreq_ref: R=00000002 PUT SUBREQ  r=1
   kworker/u80:1-139     [000] .....   822.223184: netfs_sreq: R=00000003[1] DOWN IO    f=00 s=200000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.223223: netfs_sreq: R=00000003[1] DOWN TERM  f=00 s=200000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.223223: netfs_rreq: R=00000003 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   822.223227: netfs_rreq: R=00000003 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.223232: netfs_rreq: R=00000003 DR DONE    f=00
     kworker/0:1-9       [000] .....   822.223232: netfs_sreq_ref: R=00000003[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.223232: netfs_sreq_ref: R=00000003[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   822.223232: netfs_sreq: R=00000003[1] DOWN FREE  f=00 s=200000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.223233: netfs_rreq_ref: R=00000003 PUT SUBREQ  r=1
   kworker/u80:1-139     [000] .....   822.233357: netfs_sreq: R=00000004[1] DOWN IO    f=00 s=300000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.233377: netfs_sreq: R=00000004[1] DOWN TERM  f=00 s=300000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.233377: netfs_rreq: R=00000004 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   822.233380: netfs_rreq: R=00000004 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.233384: netfs_rreq: R=00000004 DR DONE    f=00
     kworker/0:1-9       [000] .....   822.233384: netfs_sreq_ref: R=00000004[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.233385: netfs_sreq_ref: R=00000004[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   822.233385: netfs_sreq: R=00000004[1] DOWN FREE  f=00 s=300000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.233385: netfs_rreq_ref: R=00000004 PUT SUBREQ  r=1
   kworker/u80:1-139     [000] .....   822.237672: netfs_sreq: R=00000005[1] DOWN IO    f=00 s=400000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.237707: netfs_sreq: R=00000005[1] DOWN TERM  f=00 s=400000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.237707: netfs_rreq: R=00000005 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   822.237711: netfs_rreq: R=00000005 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.237714: netfs_rreq: R=00000005 DR DONE    f=00
     kworker/0:1-9       [000] .....   822.237714: netfs_sreq_ref: R=00000005[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.237715: netfs_sreq_ref: R=00000005[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   822.237715: netfs_sreq: R=00000005[1] DOWN FREE  f=00 s=400000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.237715: netfs_rreq_ref: R=00000005 PUT SUBREQ  r=1
   kworker/u80:1-139     [000] .....   822.242285: netfs_sreq: R=00000006[1] DOWN IO    f=00 s=500000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.242312: netfs_sreq: R=00000006[1] DOWN TERM  f=00 s=500000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.242313: netfs_rreq: R=00000006 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   822.242316: netfs_rreq: R=00000006 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.242320: netfs_rreq: R=00000006 DR DONE    f=00
     kworker/0:1-9       [000] .....   822.242320: netfs_sreq_ref: R=00000006[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.242321: netfs_sreq_ref: R=00000006[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   822.242321: netfs_sreq: R=00000006[1] DOWN FREE  f=00 s=500000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.242321: netfs_rreq_ref: R=00000006 PUT SUBREQ  r=1
   kworker/u80:1-139     [000] .....   822.246313: netfs_sreq: R=00000007[1] DOWN IO    f=00 s=600000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.246344: netfs_sreq: R=00000007[1] DOWN TERM  f=00 s=600000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.246345: netfs_rreq: R=00000007 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   822.246348: netfs_rreq: R=00000007 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.246352: netfs_rreq: R=00000007 DR DONE    f=00
     kworker/0:1-9       [000] .....   822.246353: netfs_sreq_ref: R=00000007[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.246353: netfs_sreq_ref: R=00000007[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   822.246353: netfs_sreq: R=00000007[1] DOWN FREE  f=00 s=600000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.246353: netfs_rreq_ref: R=00000007 PUT SUBREQ  r=1
   kworker/u80:1-139     [000] .....   822.259223: netfs_sreq: R=00000008[1] DOWN IO    f=00 s=700000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.259263: netfs_sreq: R=00000008[1] DOWN TERM  f=00 s=700000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.259263: netfs_rreq: R=00000008 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   822.259266: netfs_rreq: R=00000008 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.259270: netfs_rreq: R=00000008 DR DONE    f=00
     kworker/0:1-9       [000] .....   822.259270: netfs_sreq_ref: R=00000008[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.259270: netfs_sreq_ref: R=00000008[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   822.259270: netfs_sreq: R=00000008[1] DOWN FREE  f=00 s=700000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.259271: netfs_rreq_ref: R=00000008 PUT SUBREQ  r=1
   kworker/u80:1-139     [000] .....   822.263657: netfs_sreq: R=00000009[1] DOWN IO    f=00 s=800000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.263676: netfs_sreq: R=00000009[1] DOWN TERM  f=00 s=800000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.263677: netfs_rreq: R=00000009 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   822.263682: netfs_rreq: R=00000009 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.263685: netfs_rreq: R=00000009 DR DONE    f=00
     kworker/0:1-9       [000] .....   822.263685: netfs_sreq_ref: R=00000009[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.263685: netfs_sreq_ref: R=00000009[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   822.263685: netfs_sreq: R=00000009[1] DOWN FREE  f=00 s=800000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.263686: netfs_rreq_ref: R=00000009 PUT SUBREQ  r=1
   kworker/u80:1-139     [000] .....   822.268125: netfs_sreq: R=0000000a[1] DOWN IO    f=00 s=900000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.268158: netfs_sreq: R=0000000a[1] DOWN TERM  f=00 s=900000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.268158: netfs_rreq: R=0000000a DR ASSESS  f=20
     kworker/0:1-9       [000] .....   822.268162: netfs_rreq: R=0000000a DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.268166: netfs_rreq: R=0000000a DR DONE    f=00
     kworker/0:1-9       [000] .....   822.268166: netfs_sreq_ref: R=0000000a[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.268166: netfs_sreq_ref: R=0000000a[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   822.268166: netfs_sreq: R=0000000a[1] DOWN FREE  f=00 s=900000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.268167: netfs_rreq_ref: R=0000000a PUT SUBREQ  r=1
   kworker/u80:1-139     [000] .....   822.272264: netfs_sreq: R=0000000b[1] DOWN IO    f=00 s=a00000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.272283: netfs_sreq: R=0000000b[1] DOWN TERM  f=00 s=a00000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.272283: netfs_rreq: R=0000000b DR ASSESS  f=20
     kworker/0:1-9       [000] .....   822.272287: netfs_rreq: R=0000000b DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.272291: netfs_rreq: R=0000000b DR DONE    f=00
     kworker/0:1-9       [000] .....   822.272291: netfs_sreq_ref: R=0000000b[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.272291: netfs_sreq_ref: R=0000000b[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   822.272292: netfs_sreq: R=0000000b[1] DOWN FREE  f=00 s=a00000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.272292: netfs_rreq_ref: R=0000000b PUT SUBREQ  r=1
   kworker/u80:1-139     [000] .....   822.277621: netfs_sreq: R=0000000c[1] DOWN IO    f=00 s=b00000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.277661: netfs_sreq: R=0000000c[1] DOWN TERM  f=00 s=b00000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.277661: netfs_rreq: R=0000000c DR ASSESS  f=20
     kworker/0:1-9       [000] .....   822.277664: netfs_rreq: R=0000000c DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.277667: netfs_rreq: R=0000000c DR DONE    f=00
     kworker/0:1-9       [000] .....   822.277667: netfs_sreq_ref: R=0000000c[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.277668: netfs_sreq_ref: R=0000000c[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   822.277668: netfs_sreq: R=0000000c[1] DOWN FREE  f=00 s=b00000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.277668: netfs_rreq_ref: R=0000000c PUT SUBREQ  r=1
   kworker/u80:1-139     [000] .....   822.282068: netfs_sreq: R=0000000d[1] DOWN IO    f=00 s=c00000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.282102: netfs_sreq: R=0000000d[1] DOWN TERM  f=00 s=c00000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.282102: netfs_rreq: R=0000000d DR ASSESS  f=20
     kworker/0:1-9       [000] .....   822.282106: netfs_rreq: R=0000000d DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.282110: netfs_rreq: R=0000000d DR DONE    f=00
     kworker/0:1-9       [000] .....   822.282110: netfs_sreq_ref: R=0000000d[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.282110: netfs_sreq_ref: R=0000000d[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   822.282111: netfs_sreq: R=0000000d[1] DOWN FREE  f=00 s=c00000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.282111: netfs_rreq_ref: R=0000000d PUT SUBREQ  r=1
   kworker/u80:1-139     [000] .....   822.286514: netfs_sreq: R=0000000e[1] DOWN IO    f=00 s=d00000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.286546: netfs_sreq: R=0000000e[1] DOWN TERM  f=00 s=d00000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.286546: netfs_rreq: R=0000000e DR ASSESS  f=20
     kworker/0:1-9       [000] .....   822.286550: netfs_rreq: R=0000000e DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.286554: netfs_rreq: R=0000000e DR DONE    f=00
     kworker/0:1-9       [000] .....   822.286554: netfs_sreq_ref: R=0000000e[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.286555: netfs_sreq_ref: R=0000000e[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   822.286555: netfs_sreq: R=0000000e[1] DOWN FREE  f=00 s=d00000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.286555: netfs_rreq_ref: R=0000000e PUT SUBREQ  r=1
   kworker/u80:1-139     [000] .....   822.290371: netfs_sreq: R=0000000f[1] DOWN IO    f=00 s=e00000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.290389: netfs_sreq: R=0000000f[1] DOWN TERM  f=00 s=e00000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.290389: netfs_rreq: R=0000000f DR ASSESS  f=20
     kworker/0:1-9       [000] .....   822.290393: netfs_rreq: R=0000000f DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.290397: netfs_rreq: R=0000000f DR DONE    f=00
     kworker/0:1-9       [000] .....   822.290397: netfs_sreq_ref: R=0000000f[1] PUT CLEAR   r=1
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     kworker/0:1-9       [000] .....   822.613394: netfs_sreq_ref: R=0000005a[1] PUT CLEAR   r=1
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     kworker/0:1-9       [000] .....   822.617511: netfs_sreq_ref: R=0000005b[1] PUT CLEAR   r=1
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     kworker/0:1-9       [000] .....   822.617512: netfs_rreq_ref: R=0000005b PUT SUBREQ  r=1
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     kworker/0:1-9       [000] .....   822.622352: netfs_rreq: R=0000005c DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.622356: netfs_rreq: R=0000005c DR DONE    f=00
     kworker/0:1-9       [000] .....   822.622356: netfs_sreq_ref: R=0000005c[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.622356: netfs_sreq_ref: R=0000005c[1] PUT TERM    r=0
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     kworker/0:1-9       [000] .....   822.622357: netfs_rreq_ref: R=0000005c PUT SUBREQ  r=1
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     kworker/0:1-9       [000] .....   822.626244: netfs_rreq: R=0000005d DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.626248: netfs_rreq: R=0000005d DR DONE    f=00
     kworker/0:1-9       [000] .....   822.626248: netfs_sreq_ref: R=0000005d[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.626248: netfs_sreq_ref: R=0000005d[1] PUT TERM    r=0
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     kworker/0:1-9       [000] .....   822.626249: netfs_rreq_ref: R=0000005d PUT SUBREQ  r=1
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     kworker/0:1-9       [000] .....   822.630439: netfs_rreq: R=0000005e DR DONE    f=00
     kworker/0:1-9       [000] .....   822.630439: netfs_sreq_ref: R=0000005e[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.630440: netfs_sreq_ref: R=0000005e[1] PUT TERM    r=0
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     kworker/0:1-9       [000] .....   822.630440: netfs_rreq_ref: R=0000005e PUT SUBREQ  r=1
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     kworker/0:1-9       [000] .....   822.634296: netfs_sreq_ref: R=0000005f[1] PUT CLEAR   r=1
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     kworker/0:1-9       [000] .....   822.634297: netfs_rreq_ref: R=0000005f PUT SUBREQ  r=1
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     kworker/0:1-9       [000] .....   822.638601: netfs_sreq: R=00000060[1] DOWN TERM  f=00 s=5f00000 100000/100000 e=0
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     kworker/0:1-9       [000] .....   822.638609: netfs_rreq: R=00000060 DR DONE    f=00
     kworker/0:1-9       [000] .....   822.638610: netfs_sreq_ref: R=00000060[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.638610: netfs_sreq_ref: R=00000060[1] PUT TERM    r=0
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     kworker/0:1-9       [000] .....   822.638611: netfs_rreq_ref: R=00000060 PUT SUBREQ  r=1
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     kworker/0:1-9       [000] .....   822.642446: netfs_rreq: R=00000061 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   822.642450: netfs_rreq: R=00000061 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.642453: netfs_rreq: R=00000061 DR DONE    f=00
     kworker/0:1-9       [000] .....   822.642454: netfs_sreq_ref: R=00000061[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   822.642454: netfs_sreq_ref: R=00000061[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   822.642454: netfs_sreq: R=00000061[1] DOWN FREE  f=00 s=6000000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.642454: netfs_rreq_ref: R=00000061 PUT SUBREQ  r=1
##### CPU 4 buffer started ####
   kworker/u80:1-139     [004] .....   822.646992: netfs_sreq: R=00000062[1] DOWN IO    f=00 s=6100000 100000/100000 e=0
     kworker/4:1-155     [004] .....   822.647014: netfs_sreq: R=00000062[1] DOWN TERM  f=00 s=6100000 100000/100000 e=0
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     kworker/4:1-155     [004] .....   822.647018: netfs_rreq: R=00000062 DR WAKE-IP f=20
     kworker/4:1-155     [004] .....   822.647023: netfs_rreq: R=00000062 DR DONE    f=00
     kworker/4:1-155     [004] .....   822.647023: netfs_sreq_ref: R=00000062[1] PUT CLEAR   r=1
     kworker/4:1-155     [004] .....   822.647024: netfs_sreq_ref: R=00000062[1] PUT TERM    r=0
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     kworker/4:1-155     [004] .....   822.647025: netfs_rreq_ref: R=00000062 PUT SUBREQ  r=1
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     kworker/0:1-9       [000] .....   822.659573: netfs_rreq: R=00000065 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.659577: netfs_rreq: R=00000065 DR DONE    f=00
     kworker/0:1-9       [000] .....   822.659578: netfs_sreq_ref: R=00000065[1] PUT CLEAR   r=1
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     kworker/0:1-9       [000] .....   822.659578: netfs_rreq_ref: R=00000065 PUT SUBREQ  r=1
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     kworker/0:1-9       [000] .....   822.664458: netfs_rreq: R=00000066 DR DONE    f=00
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     kworker/0:1-9       [000] .....   822.664459: netfs_rreq_ref: R=00000066 PUT SUBREQ  r=1
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     kworker/0:1-9       [000] .....   822.668747: netfs_rreq_ref: R=00000067 PUT SUBREQ  r=1
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     kworker/0:1-9       [000] .....   822.677856: netfs_sreq_ref: R=00000069[1] PUT CLEAR   r=1
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     kworker/0:1-9       [000] .....   822.677857: netfs_rreq_ref: R=00000069 PUT SUBREQ  r=1
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     kworker/0:1-9       [000] .....   822.682323: netfs_sreq_ref: R=0000006a[1] PUT CLEAR   r=1
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     kworker/0:1-9       [000] .....   822.682324: netfs_rreq_ref: R=0000006a PUT SUBREQ  r=1
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     kworker/0:1-9       [000] .....   822.686687: netfs_rreq: R=0000006b DR DONE    f=00
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     kworker/0:1-9       [000] .....   822.686689: netfs_rreq_ref: R=0000006b PUT SUBREQ  r=1
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     kworker/0:1-9       [000] .....   822.690973: netfs_sreq: R=0000006c[1] DOWN TERM  f=00 s=6b00000 100000/100000 e=0
     kworker/0:1-9       [000] .....   822.690973: netfs_rreq: R=0000006c DR ASSESS  f=20
     kworker/0:1-9       [000] .....   822.690977: netfs_rreq: R=0000006c DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   822.690981: netfs_rreq: R=0000006c DR DONE    f=00
     kworker/0:1-9       [000] .....   822.690981: netfs_sreq_ref: R=0000006c[1] PUT CLEAR   r=1
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     kworker/0:1-9       [000] .....   823.329275: netfs_rreq: R=00000101 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   823.329279: netfs_rreq: R=00000101 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   823.329283: netfs_rreq: R=00000101 DR DONE    f=00
     kworker/0:1-9       [000] .....   823.329284: netfs_sreq_ref: R=00000101[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   823.329284: netfs_sreq_ref: R=00000101[1] PUT TERM    r=0
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     kworker/0:1-9       [000] .....   823.329284: netfs_rreq_ref: R=00000101 PUT SUBREQ  r=1
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     kworker/0:1-9       [000] .....   823.333672: netfs_rreq: R=00000102 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   823.333676: netfs_rreq: R=00000102 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   823.333679: netfs_rreq: R=00000102 DR DONE    f=00
     kworker/0:1-9       [000] .....   823.333679: netfs_sreq_ref: R=00000102[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   823.333680: netfs_sreq_ref: R=00000102[1] PUT TERM    r=0
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     kworker/0:1-9       [000] .....   823.333680: netfs_rreq_ref: R=00000102 PUT SUBREQ  r=1
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     kworker/0:1-9       [000] .....   823.337955: netfs_rreq: R=00000103 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   823.337959: netfs_rreq: R=00000103 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   823.337963: netfs_rreq: R=00000103 DR DONE    f=00
     kworker/0:1-9       [000] .....   823.337963: netfs_sreq_ref: R=00000103[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   823.337963: netfs_sreq_ref: R=00000103[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   823.337964: netfs_sreq: R=00000103[1] DOWN FREE  f=00 s=10200000 100000/100000 e=0
     kworker/0:1-9       [000] .....   823.337964: netfs_rreq_ref: R=00000103 PUT SUBREQ  r=1
##### CPU 15 buffer started ####
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    kworker/15:2-296     [015] .....   823.342292: netfs_rreq: R=00000104 DR WAKE-IP f=20
    kworker/15:2-296     [015] .....   823.342297: netfs_rreq: R=00000104 DR DONE    f=00
    kworker/15:2-296     [015] .....   823.342297: netfs_sreq_ref: R=00000104[1] PUT CLEAR   r=1
    kworker/15:2-296     [015] .....   823.342298: netfs_sreq_ref: R=00000104[1] PUT TERM    r=0
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    kworker/15:2-296     [015] .....   823.342299: netfs_rreq_ref: R=00000104 PUT SUBREQ  r=1
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    kworker/15:2-296     [015] .....   823.346077: netfs_rreq: R=00000105 DR WAKE-IP f=20
    kworker/15:2-296     [015] .....   823.346081: netfs_rreq: R=00000105 DR DONE    f=00
    kworker/15:2-296     [015] .....   823.346081: netfs_sreq_ref: R=00000105[1] PUT CLEAR   r=1
    kworker/15:2-296     [015] .....   823.346082: netfs_sreq_ref: R=00000105[1] PUT TERM    r=0
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    kworker/15:2-296     [015] .....   823.350475: netfs_rreq: R=00000106 DR WAKE-IP f=20
    kworker/15:2-296     [015] .....   823.350481: netfs_rreq: R=00000106 DR DONE    f=00
    kworker/15:2-296     [015] .....   823.350481: netfs_sreq_ref: R=00000106[1] PUT CLEAR   r=1
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    kworker/15:2-296     [015] .....   823.354786: netfs_rreq: R=00000107 DR WAKE-IP f=20
    kworker/15:2-296     [015] .....   823.354790: netfs_rreq: R=00000107 DR DONE    f=00
    kworker/15:2-296     [015] .....   823.354790: netfs_sreq_ref: R=00000107[1] PUT CLEAR   r=1
    kworker/15:2-296     [015] .....   823.354791: netfs_sreq_ref: R=00000107[1] PUT TERM    r=0
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    kworker/15:2-296     [015] .....   823.359570: netfs_rreq: R=00000108 DR WAKE-IP f=20
    kworker/15:2-296     [015] .....   823.359575: netfs_rreq: R=00000108 DR DONE    f=00
    kworker/15:2-296     [015] .....   823.359575: netfs_sreq_ref: R=00000108[1] PUT CLEAR   r=1
    kworker/15:2-296     [015] .....   823.359576: netfs_sreq_ref: R=00000108[1] PUT TERM    r=0
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    kworker/15:2-296     [015] .....   823.363321: netfs_rreq: R=00000109 DR WAKE-IP f=20
    kworker/15:2-296     [015] .....   823.363326: netfs_rreq: R=00000109 DR DONE    f=00
    kworker/15:2-296     [015] .....   823.363326: netfs_sreq_ref: R=00000109[1] PUT CLEAR   r=1
    kworker/15:2-296     [015] .....   823.363326: netfs_sreq_ref: R=00000109[1] PUT TERM    r=0
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    kworker/15:2-296     [015] .....   823.363327: netfs_rreq_ref: R=00000109 PUT SUBREQ  r=1
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    kworker/15:2-296     [015] .....   823.367479: netfs_rreq: R=0000010a DR ASSESS  f=20
    kworker/15:2-296     [015] .....   823.367483: netfs_rreq: R=0000010a DR WAKE-IP f=20
    kworker/15:2-296     [015] .....   823.367488: netfs_rreq: R=0000010a DR DONE    f=00
    kworker/15:2-296     [015] .....   823.367488: netfs_sreq_ref: R=0000010a[1] PUT CLEAR   r=1
    kworker/15:2-296     [015] .....   823.367488: netfs_sreq_ref: R=0000010a[1] PUT TERM    r=0
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    kworker/15:2-296     [015] .....   823.371981: netfs_rreq: R=0000010b DR ASSESS  f=20
    kworker/15:2-296     [015] .....   823.371985: netfs_rreq: R=0000010b DR WAKE-IP f=20
    kworker/15:2-296     [015] .....   823.371989: netfs_rreq: R=0000010b DR DONE    f=00
    kworker/15:2-296     [015] .....   823.371989: netfs_sreq_ref: R=0000010b[1] PUT CLEAR   r=1
    kworker/15:2-296     [015] .....   823.371989: netfs_sreq_ref: R=0000010b[1] PUT TERM    r=0
    kworker/15:2-296     [015] .....   823.371989: netfs_sreq: R=0000010b[1] DOWN FREE  f=00 s=10a00000 100000/100000 e=0
    kworker/15:2-296     [015] .....   823.371990: netfs_rreq_ref: R=0000010b PUT SUBREQ  r=1
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    kworker/15:2-296     [015] .....   823.376727: netfs_rreq: R=0000010c DR ASSESS  f=20
    kworker/15:2-296     [015] .....   823.376731: netfs_rreq: R=0000010c DR WAKE-IP f=20
    kworker/15:2-296     [015] .....   823.376734: netfs_rreq: R=0000010c DR DONE    f=00
    kworker/15:2-296     [015] .....   823.376734: netfs_sreq_ref: R=0000010c[1] PUT CLEAR   r=1
    kworker/15:2-296     [015] .....   823.376735: netfs_sreq_ref: R=0000010c[1] PUT TERM    r=0
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    kworker/15:2-296     [015] .....   823.376735: netfs_rreq_ref: R=0000010c PUT SUBREQ  r=1
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    kworker/15:2-296     [015] .....   823.380938: netfs_rreq: R=0000010d DR ASSESS  f=20
    kworker/15:2-296     [015] .....   823.380942: netfs_rreq: R=0000010d DR WAKE-IP f=20
    kworker/15:2-296     [015] .....   823.380946: netfs_rreq: R=0000010d DR DONE    f=00
    kworker/15:2-296     [015] .....   823.380946: netfs_sreq_ref: R=0000010d[1] PUT CLEAR   r=1
    kworker/15:2-296     [015] .....   823.380946: netfs_sreq_ref: R=0000010d[1] PUT TERM    r=0
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    kworker/15:2-296     [015] .....   823.385024: netfs_rreq: R=0000010e DR ASSESS  f=20
    kworker/15:2-296     [015] .....   823.385028: netfs_rreq: R=0000010e DR WAKE-IP f=20
    kworker/15:2-296     [015] .....   823.385032: netfs_rreq: R=0000010e DR DONE    f=00
    kworker/15:2-296     [015] .....   823.385033: netfs_sreq_ref: R=0000010e[1] PUT CLEAR   r=1
    kworker/15:2-296     [015] .....   823.385033: netfs_sreq_ref: R=0000010e[1] PUT TERM    r=0
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    kworker/15:2-296     [015] .....   823.385034: netfs_rreq_ref: R=0000010e PUT SUBREQ  r=1
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    kworker/15:2-296     [015] .....   823.389252: netfs_rreq: R=0000010f DR ASSESS  f=20
    kworker/15:2-296     [015] .....   823.389256: netfs_rreq: R=0000010f DR WAKE-IP f=20
    kworker/15:2-296     [015] .....   823.389261: netfs_rreq: R=0000010f DR DONE    f=00
    kworker/15:2-296     [015] .....   823.389261: netfs_sreq_ref: R=0000010f[1] PUT CLEAR   r=1
    kworker/15:2-296     [015] .....   823.389261: netfs_sreq_ref: R=0000010f[1] PUT TERM    r=0
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    kworker/15:2-296     [015] .....   823.393416: netfs_rreq: R=00000110 DR ASSESS  f=20
    kworker/15:2-296     [015] .....   823.393419: netfs_rreq: R=00000110 DR WAKE-IP f=20
    kworker/15:2-296     [015] .....   823.393423: netfs_rreq: R=00000110 DR DONE    f=00
    kworker/15:2-296     [015] .....   823.393424: netfs_sreq_ref: R=00000110[1] PUT CLEAR   r=1
    kworker/15:2-296     [015] .....   823.393424: netfs_sreq_ref: R=00000110[1] PUT TERM    r=0
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    kworker/15:2-296     [015] .....   823.397488: netfs_rreq: R=00000111 DR WAKE-IP f=20
    kworker/15:2-296     [015] .....   823.397492: netfs_rreq: R=00000111 DR DONE    f=00
    kworker/15:2-296     [015] .....   823.397492: netfs_sreq_ref: R=00000111[1] PUT CLEAR   r=1
    kworker/15:2-296     [015] .....   823.397492: netfs_sreq_ref: R=00000111[1] PUT TERM    r=0
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    kworker/15:2-296     [015] .....   823.402314: netfs_rreq: R=00000112 DR DONE    f=00
    kworker/15:2-296     [015] .....   823.402314: netfs_sreq_ref: R=00000112[1] PUT CLEAR   r=1
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    kworker/15:2-296     [015] .....   823.406715: netfs_rreq: R=00000113 DR DONE    f=00
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    kworker/15:2-296     [015] .....   823.475131: netfs_rreq: R=00000123 DR ASSESS  f=20
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    kworker/15:2-296     [015] .....   823.479446: netfs_rreq: R=00000124 DR ASSESS  f=20
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    kworker/15:2-296     [015] .....   823.483568: netfs_rreq: R=00000125 DR ASSESS  f=20
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    kworker/15:2-296     [015] .....   823.488553: netfs_rreq: R=00000126 DR ASSESS  f=20
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##### CPU 12 buffer started ####
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              dd-3767    [012] .....   824.501198: netfs_read: R=00000216 DIO-READ  c=00000000 ni=0 s=21500000 l=100000 sz=280000000
              dd-3767    [012] .....   824.501209: netfs_rreq_ref: R=00000216 GET SUBREQ  r=2
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              dd-3767    [012] .....   824.501209: netfs_sreq: R=00000216[1] DOWN PREP  f=00 s=21500000 0/100000 e=0
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              dd-3767    [012] .....   824.501220: netfs_rreq: R=00000216 DR WAIT-IP f=20
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              dd-3767    [012] .....   824.505298: netfs_rreq_ref: R=00000217 GET SUBREQ  r=2
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              dd-3767    [012] .....   824.509123: netfs_rreq: R=00000217 DR FREE    f=00
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              dd-3767    [012] .....   824.509150: netfs_rreq_ref: R=00000218 GET SUBREQ  r=2
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              dd-3767    [012] .....   824.509150: netfs_sreq: R=00000218[1] DOWN PREP  f=00 s=21700000 0/100000 e=0
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              dd-3767    [012] .....   824.514166: netfs_rreq: R=00000218 DR FREE    f=00
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              dd-3767    [012] .....   824.514180: netfs_read: R=00000219 DIO-READ  c=00000000 ni=0 s=21800000 l=100000 sz=280000000
              dd-3767    [012] .....   824.514192: netfs_rreq_ref: R=00000219 GET SUBREQ  r=2
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              dd-3767    [012] .....   824.514202: netfs_rreq: R=00000219 DR WAIT-IP f=20
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              dd-3767    [012] .....   824.518249: netfs_rreq_ref: R=00000219 PUT RETURN  r=0
              dd-3767    [012] .....   824.518249: netfs_rreq: R=00000219 DR FREE    f=00
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              dd-3767    [012] .....   824.518275: netfs_rreq_ref: R=0000021a GET SUBREQ  r=2
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              dd-3767    [012] .....   824.522714: netfs_rreq_ref: R=0000021b GET SUBREQ  r=2
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              dd-3767    [012] .....   824.531330: netfs_rreq: R=0000021d DR WAIT-IP f=20
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     kworker/0:1-9       [000] .....   824.534927: netfs_rreq: R=0000021d DR ASSESS  f=20
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              dd-3767    [012] .....   824.534942: netfs_rreq: R=0000021d DR FREE    f=00
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              dd-3767    [012] .....   824.538986: netfs_rreq: R=0000021e DR FREE    f=00
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              dd-3767    [012] .....   824.542929: netfs_rreq_ref: R=00000220 GET SUBREQ  r=2
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              dd-3767    [012] .....   824.556084: netfs_rreq: R=00000223 DR WAIT-IP f=20
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              dd-3767    [012] .....   824.560472: netfs_rreq: R=00000224 DR WAIT-IP f=20
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              dd-3767    [012] .....   824.565286: netfs_rreq: R=00000224 DR FREE    f=00
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              dd-3767    [012] .....   824.565320: netfs_rreq: R=00000225 DR WAIT-IP f=20
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              dd-3767    [012] .....   824.569020: netfs_rreq_ref: R=00000225 PUT RETURN  r=0
              dd-3767    [012] .....   824.569020: netfs_rreq: R=00000225 DR FREE    f=00
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              dd-3767    [012] .....   824.569056: netfs_rreq: R=00000226 DR WAIT-IP f=20
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     kworker/0:1-9       [000] .....   824.573390: netfs_rreq: R=00000226 DR WAKE-IP f=20
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              dd-3767    [012] .....   824.573400: netfs_rreq_ref: R=00000226 PUT RETURN  r=0
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              dd-3767    [012] .....   824.573425: netfs_sreq: R=00000227[1] DOWN PREP  f=00 s=22600000 0/100000 e=0
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              dd-3767    [012] .....   824.573434: netfs_rreq: R=00000227 DR WAIT-IP f=20
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     kworker/0:1-9       [000] .....   824.577380: netfs_rreq: R=00000227 DR WAKE-IP f=20
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     kworker/0:1-9       [000] .....   824.577385: netfs_rreq_ref: R=00000227 PUT SUBREQ  r=1
              dd-3767    [012] .....   824.577391: netfs_rreq_ref: R=00000227 PUT RETURN  r=0
              dd-3767    [012] .....   824.577391: netfs_rreq: R=00000227 DR FREE    f=00
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              dd-3767    [012] .....   824.577425: netfs_rreq: R=00000228 DR WAIT-IP f=20
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     kworker/0:1-9       [000] .....   824.581625: netfs_rreq: R=00000228 DR WAKE-IP f=20
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     kworker/0:1-9       [000] .....   824.581630: netfs_rreq_ref: R=00000228 PUT SUBREQ  r=1
              dd-3767    [012] .....   824.581636: netfs_rreq_ref: R=00000228 PUT RETURN  r=0
              dd-3767    [012] .....   824.581636: netfs_rreq: R=00000228 DR FREE    f=00
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              dd-3767    [012] .....   824.581649: netfs_read: R=00000229 DIO-READ  c=00000000 ni=0 s=22800000 l=100000 sz=280000000
              dd-3767    [012] .....   824.581660: netfs_rreq_ref: R=00000229 GET SUBREQ  r=2
              dd-3767    [012] b....   824.581660: netfs_sreq: R=00000229[1] DOWN ADD   f=00 s=22800000 0/100000 e=0
              dd-3767    [012] .....   824.581661: netfs_sreq: R=00000229[1] DOWN PREP  f=00 s=22800000 0/100000 e=0
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              dd-3767    [012] .....   824.581685: netfs_rreq: R=00000229 DR WAIT-IP f=20
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              dd-3767    [012] .....   824.745843: netfs_rreq_ref: R=00000250 NEW         r=1
              dd-3767    [012] .....   824.745844: netfs_read: R=00000250 DIO-READ  c=00000000 ni=0 s=24f00000 l=100000 sz=280000000
              dd-3767    [012] .....   824.745854: netfs_rreq_ref: R=00000250 GET SUBREQ  r=2
              dd-3767    [012] b....   824.745855: netfs_sreq: R=00000250[1] DOWN ADD   f=00 s=24f00000 0/100000 e=0
              dd-3767    [012] .....   824.745855: netfs_sreq: R=00000250[1] DOWN PREP  f=00 s=24f00000 0/100000 e=0
              dd-3767    [012] .....   824.745856: netfs_sreq: R=00000250[1] DOWN SUBMT f=00 s=24f00000 0/100000 e=0
              dd-3767    [012] .....   824.745864: netfs_rreq: R=00000250 DR WAIT-IP f=20
   kworker/u80:4-197     [000] .....   824.750491: netfs_sreq: R=00000250[1] DOWN IO    f=00 s=24f00000 100000/100000 e=0
     kworker/0:1-9       [000] .....   824.750509: netfs_sreq: R=00000250[1] DOWN TERM  f=00 s=24f00000 100000/100000 e=0
     kworker/0:1-9       [000] .....   824.750509: netfs_rreq: R=00000250 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   824.750512: netfs_rreq: R=00000250 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   824.750516: netfs_rreq: R=00000250 DR DONE    f=00
     kworker/0:1-9       [000] .....   824.750516: netfs_sreq_ref: R=00000250[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   824.750517: netfs_sreq_ref: R=00000250[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   824.750517: netfs_sreq: R=00000250[1] DOWN FREE  f=00 s=24f00000 100000/100000 e=0
     kworker/0:1-9       [000] .....   824.750517: netfs_rreq_ref: R=00000250 PUT SUBREQ  r=1
              dd-3767    [012] .....   824.750523: netfs_rreq_ref: R=00000250 PUT RETURN  r=0
              dd-3767    [012] .....   824.750523: netfs_rreq: R=00000250 DR FREE    f=00
              dd-3767    [012] .....   824.750536: netfs_rreq_ref: R=00000251 NEW         r=1
              dd-3767    [012] .....   824.750536: netfs_read: R=00000251 DIO-READ  c=00000000 ni=0 s=25000000 l=100000 sz=280000000
              dd-3767    [012] .....   824.750547: netfs_rreq_ref: R=00000251 GET SUBREQ  r=2
              dd-3767    [012] b....   824.750547: netfs_sreq: R=00000251[1] DOWN ADD   f=00 s=25000000 0/100000 e=0
              dd-3767    [012] .....   824.750548: netfs_sreq: R=00000251[1] DOWN PREP  f=00 s=25000000 0/100000 e=0
              dd-3767    [012] .....   824.750548: netfs_sreq: R=00000251[1] DOWN SUBMT f=00 s=25000000 0/100000 e=0
              dd-3767    [012] .....   824.750556: netfs_rreq: R=00000251 DR WAIT-IP f=20
   kworker/u80:4-197     [000] .....   824.754573: netfs_sreq: R=00000251[1] DOWN IO    f=00 s=25000000 100000/100000 e=0
     kworker/0:1-9       [000] .....   824.754605: netfs_sreq: R=00000251[1] DOWN TERM  f=00 s=25000000 100000/100000 e=0
     kworker/0:1-9       [000] .....   824.754605: netfs_rreq: R=00000251 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   824.754608: netfs_rreq: R=00000251 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   824.754612: netfs_rreq: R=00000251 DR DONE    f=00
     kworker/0:1-9       [000] .....   824.754613: netfs_sreq_ref: R=00000251[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   824.754613: netfs_sreq_ref: R=00000251[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   824.754613: netfs_sreq: R=00000251[1] DOWN FREE  f=00 s=25000000 100000/100000 e=0
     kworker/0:1-9       [000] .....   824.754613: netfs_rreq_ref: R=00000251 PUT SUBREQ  r=1
              dd-3767    [012] .....   824.754619: netfs_rreq_ref: R=00000251 PUT RETURN  r=0
              dd-3767    [012] .....   824.754619: netfs_rreq: R=00000251 DR FREE    f=00
              dd-3767    [012] .....   824.754633: netfs_rreq_ref: R=00000252 NEW         r=1
              dd-3767    [012] .....   824.754633: netfs_read: R=00000252 DIO-READ  c=00000000 ni=0 s=25100000 l=100000 sz=280000000
              dd-3767    [012] .....   824.754644: netfs_rreq_ref: R=00000252 GET SUBREQ  r=2
              dd-3767    [012] b....   824.754644: netfs_sreq: R=00000252[1] DOWN ADD   f=00 s=25100000 0/100000 e=0
              dd-3767    [012] .....   824.754644: netfs_sreq: R=00000252[1] DOWN PREP  f=00 s=25100000 0/100000 e=0
              dd-3767    [012] .....   824.754645: netfs_sreq: R=00000252[1] DOWN SUBMT f=00 s=25100000 0/100000 e=0
              dd-3767    [012] .....   824.754655: netfs_rreq: R=00000252 DR WAIT-IP f=20
   kworker/u80:4-197     [000] .....   824.759288: netfs_sreq: R=00000252[1] DOWN IO    f=00 s=25100000 100000/100000 e=0
     kworker/0:1-9       [000] .....   824.759306: netfs_sreq: R=00000252[1] DOWN TERM  f=00 s=25100000 100000/100000 e=0
     kworker/0:1-9       [000] .....   824.759306: netfs_rreq: R=00000252 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   824.759310: netfs_rreq: R=00000252 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   824.759313: netfs_rreq: R=00000252 DR DONE    f=00
     kworker/0:1-9       [000] .....   824.759314: netfs_sreq_ref: R=00000252[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   824.759314: netfs_sreq_ref: R=00000252[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   824.759314: netfs_sreq: R=00000252[1] DOWN FREE  f=00 s=25100000 100000/100000 e=0
     kworker/0:1-9       [000] .....   824.759314: netfs_rreq_ref: R=00000252 PUT SUBREQ  r=1
              dd-3767    [012] .....   824.759320: netfs_rreq_ref: R=00000252 PUT RETURN  r=0
              dd-3767    [012] .....   824.759320: netfs_rreq: R=00000252 DR FREE    f=00
              dd-3767    [012] .....   824.759333: netfs_rreq_ref: R=00000253 NEW         r=1
              dd-3767    [012] .....   824.759333: netfs_read: R=00000253 DIO-READ  c=00000000 ni=0 s=25200000 l=100000 sz=280000000
              dd-3767    [012] .....   824.759344: netfs_rreq_ref: R=00000253 GET SUBREQ  r=2
              dd-3767    [012] b....   824.759344: netfs_sreq: R=00000253[1] DOWN ADD   f=00 s=25200000 0/100000 e=0
              dd-3767    [012] .....   824.759345: netfs_sreq: R=00000253[1] DOWN PREP  f=00 s=25200000 0/100000 e=0
              dd-3767    [012] .....   824.759345: netfs_sreq: R=00000253[1] DOWN SUBMT f=00 s=25200000 0/100000 e=0
              dd-3767    [012] .....   824.759353: netfs_rreq: R=00000253 DR WAIT-IP f=20
   kworker/u80:4-197     [000] .....   824.763208: netfs_sreq: R=00000253[1] DOWN IO    f=00 s=25200000 100000/100000 e=0
     kworker/0:1-9       [000] .....   824.763239: netfs_sreq: R=00000253[1] DOWN TERM  f=00 s=25200000 100000/100000 e=0
     kworker/0:1-9       [000] .....   824.763240: netfs_rreq: R=00000253 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   824.763243: netfs_rreq: R=00000253 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   824.763247: netfs_rreq: R=00000253 DR DONE    f=00
     kworker/0:1-9       [000] .....   824.763247: netfs_sreq_ref: R=00000253[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   824.763247: netfs_sreq_ref: R=00000253[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   824.763248: netfs_sreq: R=00000253[1] DOWN FREE  f=00 s=25200000 100000/100000 e=0
     kworker/0:1-9       [000] .....   824.763248: netfs_rreq_ref: R=00000253 PUT SUBREQ  r=1
              dd-3767    [012] .....   824.763253: netfs_rreq_ref: R=00000253 PUT RETURN  r=0
              dd-3767    [012] .....   824.763254: netfs_rreq: R=00000253 DR FREE    f=00
              dd-3767    [012] .....   824.763266: netfs_rreq_ref: R=00000254 NEW         r=1
              dd-3767    [012] .....   824.763267: netfs_read: R=00000254 DIO-READ  c=00000000 ni=0 s=25300000 l=100000 sz=280000000
              dd-3767    [012] .....   824.763277: netfs_rreq_ref: R=00000254 GET SUBREQ  r=2
              dd-3767    [012] b....   824.763277: netfs_sreq: R=00000254[1] DOWN ADD   f=00 s=25300000 0/100000 e=0
              dd-3767    [012] .....   824.763278: netfs_sreq: R=00000254[1] DOWN PREP  f=00 s=25300000 0/100000 e=0
              dd-3767    [012] .....   824.763278: netfs_sreq: R=00000254[1] DOWN SUBMT f=00 s=25300000 0/100000 e=0
              dd-3767    [012] .....   824.763286: netfs_rreq: R=00000254 DR WAIT-IP f=20
   kworker/u80:4-197     [000] .....   824.767582: netfs_sreq: R=00000254[1] DOWN IO    f=00 s=25300000 100000/100000 e=0
     kworker/0:1-9       [000] .....   824.767600: netfs_sreq: R=00000254[1] DOWN TERM  f=00 s=25300000 100000/100000 e=0
     kworker/0:1-9       [000] .....   824.767600: netfs_rreq: R=00000254 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   824.767604: netfs_rreq: R=00000254 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   824.767607: netfs_rreq: R=00000254 DR DONE    f=00
     kworker/0:1-9       [000] .....   824.767608: netfs_sreq_ref: R=00000254[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   824.767608: netfs_sreq_ref: R=00000254[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   824.767608: netfs_sreq: R=00000254[1] DOWN FREE  f=00 s=25300000 100000/100000 e=0
     kworker/0:1-9       [000] .....   824.767608: netfs_rreq_ref: R=00000254 PUT SUBREQ  r=1
              dd-3767    [012] .....   824.767614: netfs_rreq_ref: R=00000254 PUT RETURN  r=0
              dd-3767    [012] .....   824.767614: netfs_rreq: R=00000254 DR FREE    f=00
              dd-3767    [012] .....   824.767627: netfs_rreq_ref: R=00000255 NEW         r=1
              dd-3767    [012] .....   824.767627: netfs_read: R=00000255 DIO-READ  c=00000000 ni=0 s=25400000 l=100000 sz=280000000
              dd-3767    [012] .....   824.767638: netfs_rreq_ref: R=00000255 GET SUBREQ  r=2
              dd-3767    [012] b....   824.767638: netfs_sreq: R=00000255[1] DOWN ADD   f=00 s=25400000 0/100000 e=0
              dd-3767    [012] .....   824.767639: netfs_sreq: R=00000255[1] DOWN PREP  f=00 s=25400000 0/100000 e=0
              dd-3767    [012] .....   824.767639: netfs_sreq: R=00000255[1] DOWN SUBMT f=00 s=25400000 0/100000 e=0
              dd-3767    [012] .....   824.767648: netfs_rreq: R=00000255 DR WAIT-IP f=20
   kworker/u80:4-197     [000] .....   824.771563: netfs_sreq: R=00000255[1] DOWN IO    f=00 s=25400000 100000/100000 e=0
     kworker/0:1-9       [000] .....   824.771595: netfs_sreq: R=00000255[1] DOWN TERM  f=00 s=25400000 100000/100000 e=0
     kworker/0:1-9       [000] .....   824.771595: netfs_rreq: R=00000255 DR ASSESS  f=20
     kworker/0:1-9       [000] .....   824.771598: netfs_rreq: R=00000255 DR WAKE-IP f=20
     kworker/0:1-9       [000] .....   824.771602: netfs_rreq: R=00000255 DR DONE    f=00
     kworker/0:1-9       [000] .....   824.771602: netfs_sreq_ref: R=00000255[1] PUT CLEAR   r=1
     kworker/0:1-9       [000] .....   824.771603: netfs_sreq_ref: R=00000255[1] PUT TERM    r=0
     kworker/0:1-9       [000] .....   824.771603: netfs_sreq: R=00000255[1] DOWN FREE  f=00 s=25400000 100000/100000 e=0

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maintainer
#5 lore raw
In reply to David Howells

Okay, I think I see the problem.

Looking at the following extraction from the trace:

Quoted 6 lines

netfs_rreq_ref: R=0000290e NEW r=1
netfs_read: R=0000290e READAHEAD c=00000000 ni=0 s=85e00000 l=800000 sz=280000000
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read
netfs_folio: i=f1c2900000000000 ix=86000-861ff read
netfs_folio: i=f1c2900000000000 ix=86200-863ff read
netfs_folio: i=f1c2900000000000 ix=86400-865ff read

We're requesting reads of four folios, each consisting of 512 pages for a total of 8MiB.

Quoted 8 lines

netfs_sreq: R=0000290e[1] DOWN SUBMT f=02 s=85e00000 0/100000 e=0
netfs_sreq: R=0000290e[2] DOWN SUBMT f=02 s=85f00000 0/100000 e=0
netfs_sreq: R=0000290e[3] DOWN SUBMT f=02 s=86000000 0/100000 e=0
netfs_sreq: R=0000290e[4] DOWN SUBMT f=02 s=86100000 0/100000 e=0
netfs_sreq: R=0000290e[5] DOWN SUBMT f=02 s=86200000 0/100000 e=0
netfs_sreq: R=0000290e[6] DOWN SUBMT f=02 s=86300000 0/100000 e=0
netfs_sreq: R=0000290e[7] DOWN SUBMT f=02 s=86400000 0/100000 e=0
netfs_sreq: R=0000290e[8] DOWN SUBMT f=02 s=86500000 0/100000 e=0

That got broken down into 8 submissions, each for a 1MiB slice.

Quoted 3 lines

netfs_sreq: R=0000290e[1] DOWN IO f=02 s=85e00000 100000/100000 e=0
netfs_progress: R=0000290e[01] s=85e00000 ct=0/100000 pa=100000/100000 sl=0
netfs_donate: R=0000290e[01] -> [02] to-next am=100000

Subrequest 1 completed, but wasn't large enough to cover a whole folio, so it donated its coverage forwards to subreq 2.

Quoted 3 lines

netfs_sreq: R=0000290e[6] DOWN IO f=02 s=86300000 100000/100000 e=0
netfs_progress: R=0000290e[06] s=86300000 ct=0/100000 pa=100000/100000 sl=2
netfs_donate: R=0000290e[06] -> [05] tail-to-prev am=100000

Subrequest 6 completed, but wasn't large enough to cover a whole folio, so it donated its coverage backwards to subreq 5.

Quoted 4 lines

netfs_sreq: R=0000290e[2] DOWN IO f=02 s=85f00000 100000/100000 e=0
netfs_progress: R=0000290e[02] s=85e00000 ct=0/200000 pa=200000/200000 sl=0
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read-done
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read-unlock

Subreq 2 completed, and with the donation from subreq 1, had sufficient to unlock the first folio.

Quoted 4 lines

netfs_sreq: R=0000290e[5] DOWN IO f=02 s=86200000 100000/100000 e=0
netfs_progress: R=0000290e[05] s=86200000 ct=0/200000 pa=200000/200000 sl=2
netfs_folio: i=f1c2900000000000 ix=86200-863ff read-done
netfs_folio: i=f1c2900000000000 ix=86200-863ff read-unlock

Subreq 5 completed, and with the donation from subreq 6, had sufficient to unlock the third folio.

Quoted 3 lines

netfs_sreq: R=0000290e[3] DOWN IO f=02 s=86000000 100000/100000 e=0
netfs_progress: R=0000290e[03] s=86000000 ct=0/100000 pa=100000/100000 sl=1
netfs_donate: R=0000290e[03] -> [04] to-next am=100000

Subrequest 3 completed, but wasn't large enough to cover a whole folio, so it donated its coverage forwards to subreq 4. So far, so good.

Quoted 3 lines

netfs_sreq: R=0000290e[7] DOWN IO f=02 s=86400000 100000/100000 e=0
netfs_progress: R=0000290e[07] s=86400000 ct=0/100000 pa=100000/100000 sl=3
netfs_donate: R=0000290e[07] -> [04] to-prev am=0

Subreq 7 completed, but wasn't large enough to cover a whole folio, so it donated its coverage backwards to subreq 4. This is a bug as subreq 7 is not contiguous with subreq 4. It should instead have donated forwards to subreq 8.

Quoted 5 lines

netfs_sreq: R=0000290e[4] DOWN IO f=02 s=86100000 100000/100000 e=0
netfs_sreq: R=0000290e[4] DOWN +DON f=02 s=86000000 300000/300000 e=0
netfs_progress: R=0000290e[04] s=86000000 ct=0/300000 pa=200000/300000 sl=1
netfs_folio: i=f1c2900000000000 ix=86000-861ff read-done
netfs_folio: i=f1c2900000000000 ix=86000-861ff read-unlock

Subreq 4 completed, and with the donation from subreq 2, had sufficient to unlock the second folio. However, it also has some excess from subreq 7 that it can't do anything with - and this gets lost.

Quoted 3 lines

netfs_sreq: R=0000290e[8] DOWN IO f=02 s=86500000 100000/100000 e=0
netfs_progress: R=0000290e[08] s=86500000 ct=0/100000 pa=100000/100000 sl=3
netfs_donate: R=0000290e[08] -> [04] tail-to-prev am=100000

Here's a repeat of the bug: subreq 8 donates to subreq 4, but, again, is not contiguous. As these are happening concurrently, the other thread hasn't delisted subreq 4 yet.

Quoted 2 lines

netfs_sreq: R=0000290e[4] DOWN +DON f=02 s=86000000 400000/400000 e=0
netfs_progress: R=0000290e[04] s=86200000 ct=200000/400000 pa=200000/200000 sl=2

The request screwed at this point: subreq 4 shows the extra stuff it has been donated, but it is unable to do anything with it. There is no folio to wrangle as the third slot (sl=2) in the queue has already been cleared.

(Note that this bug shouldn't happen with the patches currently on my netfs-writeback branch as I got rid of the donation mechanism in preference for something simpler with single-threaded collection.)

David

#6 lore raw
Quoted 97 lines · David Howells

Okay, I think I see the problem.

Looking at the following extraction from the trace:

Quoted 6 lines

netfs_rreq_ref: R=0000290e NEW r=1
netfs_read: R=0000290e READAHEAD c=00000000 ni=0 s=85e00000 l=800000 sz=280000000
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read
netfs_folio: i=f1c2900000000000 ix=86000-861ff read
netfs_folio: i=f1c2900000000000 ix=86200-863ff read
netfs_folio: i=f1c2900000000000 ix=86400-865ff read

We're requesting reads of four folios, each consisting of 512 pages for a total of 8MiB.

Quoted 8 lines

netfs_sreq: R=0000290e[1] DOWN SUBMT f=02 s=85e00000 0/100000 e=0
netfs_sreq: R=0000290e[2] DOWN SUBMT f=02 s=85f00000 0/100000 e=0
netfs_sreq: R=0000290e[3] DOWN SUBMT f=02 s=86000000 0/100000 e=0
netfs_sreq: R=0000290e[4] DOWN SUBMT f=02 s=86100000 0/100000 e=0
netfs_sreq: R=0000290e[5] DOWN SUBMT f=02 s=86200000 0/100000 e=0
netfs_sreq: R=0000290e[6] DOWN SUBMT f=02 s=86300000 0/100000 e=0
netfs_sreq: R=0000290e[7] DOWN SUBMT f=02 s=86400000 0/100000 e=0
netfs_sreq: R=0000290e[8] DOWN SUBMT f=02 s=86500000 0/100000 e=0

That got broken down into 8 submissions, each for a 1MiB slice.

Quoted 3 lines

netfs_sreq: R=0000290e[1] DOWN IO f=02 s=85e00000 100000/100000 e=0
netfs_progress: R=0000290e[01] s=85e00000 ct=0/100000 pa=100000/100000 sl=0
netfs_donate: R=0000290e[01] -> [02] to-next am=100000

Subrequest 1 completed, but wasn't large enough to cover a whole folio, so it donated its coverage forwards to subreq 2.

Quoted 3 lines

netfs_sreq: R=0000290e[6] DOWN IO f=02 s=86300000 100000/100000 e=0
netfs_progress: R=0000290e[06] s=86300000 ct=0/100000 pa=100000/100000 sl=2
netfs_donate: R=0000290e[06] -> [05] tail-to-prev am=100000

Subrequest 6 completed, but wasn't large enough to cover a whole folio, so it donated its coverage backwards to subreq 5.

Quoted 4 lines

netfs_sreq: R=0000290e[2] DOWN IO f=02 s=85f00000 100000/100000 e=0
netfs_progress: R=0000290e[02] s=85e00000 ct=0/200000 pa=200000/200000 sl=0
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read-done
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read-unlock

Subreq 2 completed, and with the donation from subreq 1, had sufficient to unlock the first folio.

Quoted 4 lines

netfs_sreq: R=0000290e[5] DOWN IO f=02 s=86200000 100000/100000 e=0
netfs_progress: R=0000290e[05] s=86200000 ct=0/200000 pa=200000/200000 sl=2
netfs_folio: i=f1c2900000000000 ix=86200-863ff read-done
netfs_folio: i=f1c2900000000000 ix=86200-863ff read-unlock

Subreq 5 completed, and with the donation from subreq 6, had sufficient to unlock the third folio.

Quoted 3 lines

netfs_sreq: R=0000290e[3] DOWN IO f=02 s=86000000 100000/100000 e=0
netfs_progress: R=0000290e[03] s=86000000 ct=0/100000 pa=100000/100000 sl=1
netfs_donate: R=0000290e[03] -> [04] to-next am=100000

Subrequest 3 completed, but wasn't large enough to cover a whole folio, so it donated its coverage forwards to subreq 4. So far, so good.

Quoted 3 lines

netfs_sreq: R=0000290e[7] DOWN IO f=02 s=86400000 100000/100000 e=0
netfs_progress: R=0000290e[07] s=86400000 ct=0/100000 pa=100000/100000 sl=3
netfs_donate: R=0000290e[07] -> [04] to-prev am=0

Subreq 7 completed, but wasn't large enough to cover a whole folio, so it donated its coverage backwards to subreq 4. This is a bug as subreq 7 is not contiguous with subreq 4. It should instead have donated forwards to subreq 8.

Quoted 5 lines

netfs_sreq: R=0000290e[4] DOWN IO f=02 s=86100000 100000/100000 e=0
netfs_sreq: R=0000290e[4] DOWN +DON f=02 s=86000000 300000/300000 e=0
netfs_progress: R=0000290e[04] s=86000000 ct=0/300000 pa=200000/300000 sl=1
netfs_folio: i=f1c2900000000000 ix=86000-861ff read-done
netfs_folio: i=f1c2900000000000 ix=86000-861ff read-unlock

Subreq 4 completed, and with the donation from subreq 2, had sufficient to unlock the second folio. However, it also has some excess from subreq 7 that it can't do anything with - and this gets lost.

Quoted 3 lines

netfs_sreq: R=0000290e[8] DOWN IO f=02 s=86500000 100000/100000 e=0
netfs_progress: R=0000290e[08] s=86500000 ct=0/100000 pa=100000/100000 sl=3
netfs_donate: R=0000290e[08] -> [04] tail-to-prev am=100000

Here's a repeat of the bug: subreq 8 donates to subreq 4, but, again, is not contiguous. As these are happening concurrently, the other thread hasn't delisted subreq 4 yet.

Quoted 2 lines

netfs_sreq: R=0000290e[4] DOWN +DON f=02 s=86000000 400000/400000 e=0
netfs_progress: R=0000290e[04] s=86200000 ct=200000/400000 pa=200000/200000 sl=2

The request screwed at this point: subreq 4 shows the extra stuff it has been donated, but it is unable to do anything with it. There is no folio to wrangle as the third slot (sl=2) in the queue has already been cleared.

Quoted 6 lines

(Note that this bug shouldn't happen with the patches currently on my netfs-writeback branch as I got rid of the donation mechanism in preference for something simpler with single-threaded collection.)

David

Hi David,

Tried your submitted patch "netfs: Fix non-contiguous donation between completed reads" with the same workload.
It seems to be crashing elsewhere. I'm trying to get the OOPS message and ftrace, but it seems to be crashing the kernel.

Signature · 2 lines
Regards,
Shyam
#7 lore raw
Quoted 108 lines · Shyam Prasad N
Quoted 97 lines · David Howells

Okay, I think I see the problem.

Looking at the following extraction from the trace:

Quoted 6 lines

netfs_rreq_ref: R=0000290e NEW r=1
netfs_read: R=0000290e READAHEAD c=00000000 ni=0 s=85e00000 l=800000 sz=280000000
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read
netfs_folio: i=f1c2900000000000 ix=86000-861ff read
netfs_folio: i=f1c2900000000000 ix=86200-863ff read
netfs_folio: i=f1c2900000000000 ix=86400-865ff read

We're requesting reads of four folios, each consisting of 512 pages for a total of 8MiB.

Quoted 8 lines

netfs_sreq: R=0000290e[1] DOWN SUBMT f=02 s=85e00000 0/100000 e=0
netfs_sreq: R=0000290e[2] DOWN SUBMT f=02 s=85f00000 0/100000 e=0
netfs_sreq: R=0000290e[3] DOWN SUBMT f=02 s=86000000 0/100000 e=0
netfs_sreq: R=0000290e[4] DOWN SUBMT f=02 s=86100000 0/100000 e=0
netfs_sreq: R=0000290e[5] DOWN SUBMT f=02 s=86200000 0/100000 e=0
netfs_sreq: R=0000290e[6] DOWN SUBMT f=02 s=86300000 0/100000 e=0
netfs_sreq: R=0000290e[7] DOWN SUBMT f=02 s=86400000 0/100000 e=0
netfs_sreq: R=0000290e[8] DOWN SUBMT f=02 s=86500000 0/100000 e=0

That got broken down into 8 submissions, each for a 1MiB slice.

Quoted 3 lines

netfs_sreq: R=0000290e[1] DOWN IO f=02 s=85e00000 100000/100000 e=0
netfs_progress: R=0000290e[01] s=85e00000 ct=0/100000 pa=100000/100000 sl=0
netfs_donate: R=0000290e[01] -> [02] to-next am=100000

Subrequest 1 completed, but wasn't large enough to cover a whole folio, so it donated its coverage forwards to subreq 2.

Quoted 3 lines

netfs_sreq: R=0000290e[6] DOWN IO f=02 s=86300000 100000/100000 e=0
netfs_progress: R=0000290e[06] s=86300000 ct=0/100000 pa=100000/100000 sl=2
netfs_donate: R=0000290e[06] -> [05] tail-to-prev am=100000

Subrequest 6 completed, but wasn't large enough to cover a whole folio, so it donated its coverage backwards to subreq 5.

Quoted 4 lines

netfs_sreq: R=0000290e[2] DOWN IO f=02 s=85f00000 100000/100000 e=0
netfs_progress: R=0000290e[02] s=85e00000 ct=0/200000 pa=200000/200000 sl=0
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read-done
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read-unlock

Subreq 2 completed, and with the donation from subreq 1, had sufficient to unlock the first folio.

Quoted 4 lines

netfs_sreq: R=0000290e[5] DOWN IO f=02 s=86200000 100000/100000 e=0
netfs_progress: R=0000290e[05] s=86200000 ct=0/200000 pa=200000/200000 sl=2
netfs_folio: i=f1c2900000000000 ix=86200-863ff read-done
netfs_folio: i=f1c2900000000000 ix=86200-863ff read-unlock

Subreq 5 completed, and with the donation from subreq 6, had sufficient to unlock the third folio.

Quoted 3 lines

netfs_sreq: R=0000290e[3] DOWN IO f=02 s=86000000 100000/100000 e=0
netfs_progress: R=0000290e[03] s=86000000 ct=0/100000 pa=100000/100000 sl=1
netfs_donate: R=0000290e[03] -> [04] to-next am=100000

Subrequest 3 completed, but wasn't large enough to cover a whole folio, so it donated its coverage forwards to subreq 4. So far, so good.

Quoted 3 lines

netfs_sreq: R=0000290e[7] DOWN IO f=02 s=86400000 100000/100000 e=0
netfs_progress: R=0000290e[07] s=86400000 ct=0/100000 pa=100000/100000 sl=3
netfs_donate: R=0000290e[07] -> [04] to-prev am=0

Subreq 7 completed, but wasn't large enough to cover a whole folio, so it donated its coverage backwards to subreq 4. This is a bug as subreq 7 is not contiguous with subreq 4. It should instead have donated forwards to subreq 8.

Quoted 5 lines

netfs_sreq: R=0000290e[4] DOWN IO f=02 s=86100000 100000/100000 e=0
netfs_sreq: R=0000290e[4] DOWN +DON f=02 s=86000000 300000/300000 e=0
netfs_progress: R=0000290e[04] s=86000000 ct=0/300000 pa=200000/300000 sl=1
netfs_folio: i=f1c2900000000000 ix=86000-861ff read-done
netfs_folio: i=f1c2900000000000 ix=86000-861ff read-unlock

Subreq 4 completed, and with the donation from subreq 2, had sufficient to unlock the second folio. However, it also has some excess from subreq 7 that it can't do anything with - and this gets lost.

Quoted 3 lines

netfs_sreq: R=0000290e[8] DOWN IO f=02 s=86500000 100000/100000 e=0
netfs_progress: R=0000290e[08] s=86500000 ct=0/100000 pa=100000/100000 sl=3
netfs_donate: R=0000290e[08] -> [04] tail-to-prev am=100000

Here's a repeat of the bug: subreq 8 donates to subreq 4, but, again, is not contiguous. As these are happening concurrently, the other thread hasn't delisted subreq 4 yet.

Quoted 2 lines

netfs_sreq: R=0000290e[4] DOWN +DON f=02 s=86000000 400000/400000 e=0
netfs_progress: R=0000290e[04] s=86200000 ct=200000/400000 pa=200000/200000 sl=2

The request screwed at this point: subreq 4 shows the extra stuff it has been donated, but it is unable to do anything with it. There is no folio to wrangle as the third slot (sl=2) in the queue has already been cleared.

Quoted 6 lines

(Note that this bug shouldn't happen with the patches currently on my netfs-writeback branch as I got rid of the donation mechanism in preference for something simpler with single-threaded collection.)

David

Hi David,

Quoted 8 lines

Tried your submitted patch "netfs: Fix non-contiguous donation between completed reads" with the same workload.
It seems to be crashing elsewhere. I'm trying to get the OOPS message and ftrace, but it seems to be crashing the kernel.

--
Regards,
Shyam

Here's what I managed to get before the VM crashed:

[Wed Dec  4 16:27:10 2024] BUG: kernel NULL pointer dereference,
address: 0000000000000068
[Wed Dec  4 16:27:10 2024] #PF: supervisor read access in kernel mode
[Wed Dec  4 16:27:10 2024] #PF: error_code(0x0000) - not-present page
[Wed Dec  4 16:27:10 2024] PGD 0 P4D 0
[Wed Dec  4 16:27:10 2024] Oops: Oops: 0000 [#1] SMP PTI
[Wed Dec  4 16:27:10 2024] CPU: 6 UID: 0 PID: 1263 Comm: kworker/6:3
Tainted: G           OE      6.12.0-mainline #10
[Wed Dec  4 16:27:10 2024] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
[Wed Dec  4 16:27:10 2024] Hardware name: Microsoft Corporation
Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1
08/23/2024
[Wed Dec  4 16:27:10 2024] Workqueue: cifsiod smb2_readv_worker [cifs]
[Wed Dec  4 16:27:10 2024] RIP:
0010:netfs_consume_read_data.isra.0+0x2d6/0xbe0 [netfs]
[Wed Dec  4 16:27:10 2024] Code: 48 8b 43 78 4c 8b 7d c0 4c 8b 43 68
48 85 c0 0f 85 76 05 00 00 48 8b 55 90 48 8b 73 30 48 83 c2 70 48 39
d6 74 16 48 8b 7d 88 <48> 8b 4f 68 48 03 4f 60 48 39 4b 60 0f 84 58 06
00 00 49 29 c0 48
[Wed Dec  4 16:27:10 2024] RSP: 0018:ffffad4a4582bd98 EFLAGS: 00010283
[Wed Dec  4 16:27:10 2024] RAX: 0000000000000000 RBX: ffff9810d6ff6280
RCX: 0000000000100000
[Wed Dec  4 16:27:10 2024] RDX: ffff981154071eb0 RSI: ffff9810d6ff71a8
RDI: 0000000000000000
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged
CPU for >10000us 4 times, consider switching to WQ_UNBOUND
[Wed Dec  4 16:27:10 2024] RBP: ffffad4a4582be10 R08: 0000000000100000
R09: 0000000000000000
[Wed Dec  4 16:27:10 2024] R10: 0000000000000008 R11: fefefefefefefeff
R12: 0000000000000000
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged
CPU for >10000us 5 times, consider switching to WQ_UNBOUND
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged
CPU for >10000us 7 times, consider switching to WQ_UNBOUND
[Wed Dec  4 16:27:10 2024] R13: ffff981154072028 R14: 0000000000200000
R15: ffff981154072028
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged

CPU for >10000us 11 times, consider switching to WQ_UNBOUND

Signature · 2 lines
Regards,
Shyam
maintainer
#8 lore raw
Quoted 1 line · Shyam Prasad N

0010:netfs_consume_read_data.isra.0+0x2d6/0xbe0 [netfs]

Can you tell me what line that is?

David

#10 lore raw
In reply to Shyam Prasad N

If you run the kernel under gdb and set a breakpoint on panic you should be able to see the exact line where it failedand you will also be able to check the variables and what they are set to.

Quoted 165 lines · Shyam Prasad N
Quoted 108 lines · Shyam Prasad N
Quoted 97 lines · David Howells

Okay, I think I see the problem.

Looking at the following extraction from the trace:

Quoted 6 lines

netfs_rreq_ref: R=0000290e NEW r=1
netfs_read: R=0000290e READAHEAD c=00000000 ni=0 s=85e00000 l=800000 sz=280000000
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read
netfs_folio: i=f1c2900000000000 ix=86000-861ff read
netfs_folio: i=f1c2900000000000 ix=86200-863ff read
netfs_folio: i=f1c2900000000000 ix=86400-865ff read

We're requesting reads of four folios, each consisting of 512 pages for a total of 8MiB.

Quoted 8 lines

netfs_sreq: R=0000290e[1] DOWN SUBMT f=02 s=85e00000 0/100000 e=0
netfs_sreq: R=0000290e[2] DOWN SUBMT f=02 s=85f00000 0/100000 e=0
netfs_sreq: R=0000290e[3] DOWN SUBMT f=02 s=86000000 0/100000 e=0
netfs_sreq: R=0000290e[4] DOWN SUBMT f=02 s=86100000 0/100000 e=0
netfs_sreq: R=0000290e[5] DOWN SUBMT f=02 s=86200000 0/100000 e=0
netfs_sreq: R=0000290e[6] DOWN SUBMT f=02 s=86300000 0/100000 e=0
netfs_sreq: R=0000290e[7] DOWN SUBMT f=02 s=86400000 0/100000 e=0
netfs_sreq: R=0000290e[8] DOWN SUBMT f=02 s=86500000 0/100000 e=0

That got broken down into 8 submissions, each for a 1MiB slice.

Quoted 3 lines

netfs_sreq: R=0000290e[1] DOWN IO f=02 s=85e00000 100000/100000 e=0
netfs_progress: R=0000290e[01] s=85e00000 ct=0/100000 pa=100000/100000 sl=0
netfs_donate: R=0000290e[01] -> [02] to-next am=100000

Subrequest 1 completed, but wasn't large enough to cover a whole folio, so it donated its coverage forwards to subreq 2.

Quoted 3 lines

netfs_sreq: R=0000290e[6] DOWN IO f=02 s=86300000 100000/100000 e=0
netfs_progress: R=0000290e[06] s=86300000 ct=0/100000 pa=100000/100000 sl=2
netfs_donate: R=0000290e[06] -> [05] tail-to-prev am=100000

Subrequest 6 completed, but wasn't large enough to cover a whole folio, so it donated its coverage backwards to subreq 5.

Quoted 4 lines

netfs_sreq: R=0000290e[2] DOWN IO f=02 s=85f00000 100000/100000 e=0
netfs_progress: R=0000290e[02] s=85e00000 ct=0/200000 pa=200000/200000 sl=0
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read-done
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read-unlock

Subreq 2 completed, and with the donation from subreq 1, had sufficient to unlock the first folio.

Quoted 4 lines

netfs_sreq: R=0000290e[5] DOWN IO f=02 s=86200000 100000/100000 e=0
netfs_progress: R=0000290e[05] s=86200000 ct=0/200000 pa=200000/200000 sl=2
netfs_folio: i=f1c2900000000000 ix=86200-863ff read-done
netfs_folio: i=f1c2900000000000 ix=86200-863ff read-unlock

Subreq 5 completed, and with the donation from subreq 6, had sufficient to unlock the third folio.

Quoted 3 lines

netfs_sreq: R=0000290e[3] DOWN IO f=02 s=86000000 100000/100000 e=0
netfs_progress: R=0000290e[03] s=86000000 ct=0/100000 pa=100000/100000 sl=1
netfs_donate: R=0000290e[03] -> [04] to-next am=100000

Subrequest 3 completed, but wasn't large enough to cover a whole folio, so it donated its coverage forwards to subreq 4. So far, so good.

Quoted 3 lines

netfs_sreq: R=0000290e[7] DOWN IO f=02 s=86400000 100000/100000 e=0
netfs_progress: R=0000290e[07] s=86400000 ct=0/100000 pa=100000/100000 sl=3
netfs_donate: R=0000290e[07] -> [04] to-prev am=0

Subreq 7 completed, but wasn't large enough to cover a whole folio, so it donated its coverage backwards to subreq 4. This is a bug as subreq 7 is not contiguous with subreq 4. It should instead have donated forwards to subreq 8.

Quoted 5 lines

netfs_sreq: R=0000290e[4] DOWN IO f=02 s=86100000 100000/100000 e=0
netfs_sreq: R=0000290e[4] DOWN +DON f=02 s=86000000 300000/300000 e=0
netfs_progress: R=0000290e[04] s=86000000 ct=0/300000 pa=200000/300000 sl=1
netfs_folio: i=f1c2900000000000 ix=86000-861ff read-done
netfs_folio: i=f1c2900000000000 ix=86000-861ff read-unlock

Subreq 4 completed, and with the donation from subreq 2, had sufficient to unlock the second folio. However, it also has some excess from subreq 7 that it can't do anything with - and this gets lost.

Quoted 3 lines

netfs_sreq: R=0000290e[8] DOWN IO f=02 s=86500000 100000/100000 e=0
netfs_progress: R=0000290e[08] s=86500000 ct=0/100000 pa=100000/100000 sl=3
netfs_donate: R=0000290e[08] -> [04] tail-to-prev am=100000

Here's a repeat of the bug: subreq 8 donates to subreq 4, but, again, is not contiguous. As these are happening concurrently, the other thread hasn't delisted subreq 4 yet.

Quoted 2 lines

netfs_sreq: R=0000290e[4] DOWN +DON f=02 s=86000000 400000/400000 e=0
netfs_progress: R=0000290e[04] s=86200000 ct=200000/400000 pa=200000/200000 sl=2

The request screwed at this point: subreq 4 shows the extra stuff it has been donated, but it is unable to do anything with it. There is no folio to wrangle as the third slot (sl=2) in the queue has already been cleared.

Quoted 6 lines

(Note that this bug shouldn't happen with the patches currently on my netfs-writeback branch as I got rid of the donation mechanism in preference for something simpler with single-threaded collection.)

David

Hi David,

Quoted 8 lines

Tried your submitted patch "netfs: Fix non-contiguous donation between completed reads" with the same workload.
It seems to be crashing elsewhere. I'm trying to get the OOPS message and ftrace, but it seems to be crashing the kernel.

--
Regards,
Shyam

Here's what I managed to get before the VM crashed:

[Wed Dec  4 16:27:10 2024] BUG: kernel NULL pointer dereference,
address: 0000000000000068
[Wed Dec  4 16:27:10 2024] #PF: supervisor read access in kernel mode
[Wed Dec  4 16:27:10 2024] #PF: error_code(0x0000) - not-present page
[Wed Dec  4 16:27:10 2024] PGD 0 P4D 0
[Wed Dec  4 16:27:10 2024] Oops: Oops: 0000 [#1] SMP PTI
[Wed Dec  4 16:27:10 2024] CPU: 6 UID: 0 PID: 1263 Comm: kworker/6:3
Tainted: G           OE      6.12.0-mainline #10
[Wed Dec  4 16:27:10 2024] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
[Wed Dec  4 16:27:10 2024] Hardware name: Microsoft Corporation
Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1
08/23/2024
[Wed Dec  4 16:27:10 2024] Workqueue: cifsiod smb2_readv_worker [cifs]
[Wed Dec  4 16:27:10 2024] RIP:
0010:netfs_consume_read_data.isra.0+0x2d6/0xbe0 [netfs]
[Wed Dec  4 16:27:10 2024] Code: 48 8b 43 78 4c 8b 7d c0 4c 8b 43 68
48 85 c0 0f 85 76 05 00 00 48 8b 55 90 48 8b 73 30 48 83 c2 70 48 39
d6 74 16 48 8b 7d 88 <48> 8b 4f 68 48 03 4f 60 48 39 4b 60 0f 84 58 06
00 00 49 29 c0 48
[Wed Dec  4 16:27:10 2024] RSP: 0018:ffffad4a4582bd98 EFLAGS: 00010283
[Wed Dec  4 16:27:10 2024] RAX: 0000000000000000 RBX: ffff9810d6ff6280
RCX: 0000000000100000
[Wed Dec  4 16:27:10 2024] RDX: ffff981154071eb0 RSI: ffff9810d6ff71a8
RDI: 0000000000000000
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged
CPU for >10000us 4 times, consider switching to WQ_UNBOUND
[Wed Dec  4 16:27:10 2024] RBP: ffffad4a4582be10 R08: 0000000000100000
R09: 0000000000000000
[Wed Dec  4 16:27:10 2024] R10: 0000000000000008 R11: fefefefefefefeff
R12: 0000000000000000
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged
CPU for >10000us 5 times, consider switching to WQ_UNBOUND
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged
CPU for >10000us 7 times, consider switching to WQ_UNBOUND
[Wed Dec  4 16:27:10 2024] R13: ffff981154072028 R14: 0000000000200000
R15: ffff981154072028
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged

CPU for >10000us 11 times, consider switching to WQ_UNBOUND

--
Regards,
Shyam

#11 lore raw
Quoted 171 lines · ronnie sahlberg

If you run the kernel under gdb and set a breakpoint on panic you should be able to see the exact line where it failedand you will also be able to check the variables and what they are set to.

Quoted 165 lines · Shyam Prasad N
Quoted 108 lines · Shyam Prasad N
Quoted 97 lines · David Howells

Okay, I think I see the problem.

Looking at the following extraction from the trace:

Quoted 6 lines

netfs_rreq_ref: R=0000290e NEW r=1
netfs_read: R=0000290e READAHEAD c=00000000 ni=0 s=85e00000 l=800000 sz=280000000
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read
netfs_folio: i=f1c2900000000000 ix=86000-861ff read
netfs_folio: i=f1c2900000000000 ix=86200-863ff read
netfs_folio: i=f1c2900000000000 ix=86400-865ff read

We're requesting reads of four folios, each consisting of 512 pages for a total of 8MiB.

Quoted 8 lines

netfs_sreq: R=0000290e[1] DOWN SUBMT f=02 s=85e00000 0/100000 e=0
netfs_sreq: R=0000290e[2] DOWN SUBMT f=02 s=85f00000 0/100000 e=0
netfs_sreq: R=0000290e[3] DOWN SUBMT f=02 s=86000000 0/100000 e=0
netfs_sreq: R=0000290e[4] DOWN SUBMT f=02 s=86100000 0/100000 e=0
netfs_sreq: R=0000290e[5] DOWN SUBMT f=02 s=86200000 0/100000 e=0
netfs_sreq: R=0000290e[6] DOWN SUBMT f=02 s=86300000 0/100000 e=0
netfs_sreq: R=0000290e[7] DOWN SUBMT f=02 s=86400000 0/100000 e=0
netfs_sreq: R=0000290e[8] DOWN SUBMT f=02 s=86500000 0/100000 e=0

That got broken down into 8 submissions, each for a 1MiB slice.

Quoted 3 lines

netfs_sreq: R=0000290e[1] DOWN IO f=02 s=85e00000 100000/100000 e=0
netfs_progress: R=0000290e[01] s=85e00000 ct=0/100000 pa=100000/100000 sl=0
netfs_donate: R=0000290e[01] -> [02] to-next am=100000

Subrequest 1 completed, but wasn't large enough to cover a whole folio, so it donated its coverage forwards to subreq 2.

Quoted 3 lines

netfs_sreq: R=0000290e[6] DOWN IO f=02 s=86300000 100000/100000 e=0
netfs_progress: R=0000290e[06] s=86300000 ct=0/100000 pa=100000/100000 sl=2
netfs_donate: R=0000290e[06] -> [05] tail-to-prev am=100000

Subrequest 6 completed, but wasn't large enough to cover a whole folio, so it donated its coverage backwards to subreq 5.

Quoted 4 lines

netfs_sreq: R=0000290e[2] DOWN IO f=02 s=85f00000 100000/100000 e=0
netfs_progress: R=0000290e[02] s=85e00000 ct=0/200000 pa=200000/200000 sl=0
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read-done
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read-unlock

Subreq 2 completed, and with the donation from subreq 1, had sufficient to unlock the first folio.

Quoted 4 lines

netfs_sreq: R=0000290e[5] DOWN IO f=02 s=86200000 100000/100000 e=0
netfs_progress: R=0000290e[05] s=86200000 ct=0/200000 pa=200000/200000 sl=2
netfs_folio: i=f1c2900000000000 ix=86200-863ff read-done
netfs_folio: i=f1c2900000000000 ix=86200-863ff read-unlock

Subreq 5 completed, and with the donation from subreq 6, had sufficient to unlock the third folio.

Quoted 3 lines

netfs_sreq: R=0000290e[3] DOWN IO f=02 s=86000000 100000/100000 e=0
netfs_progress: R=0000290e[03] s=86000000 ct=0/100000 pa=100000/100000 sl=1
netfs_donate: R=0000290e[03] -> [04] to-next am=100000

Subrequest 3 completed, but wasn't large enough to cover a whole folio, so it donated its coverage forwards to subreq 4. So far, so good.

Quoted 3 lines

netfs_sreq: R=0000290e[7] DOWN IO f=02 s=86400000 100000/100000 e=0
netfs_progress: R=0000290e[07] s=86400000 ct=0/100000 pa=100000/100000 sl=3
netfs_donate: R=0000290e[07] -> [04] to-prev am=0

Subreq 7 completed, but wasn't large enough to cover a whole folio, so it donated its coverage backwards to subreq 4. This is a bug as subreq 7 is not contiguous with subreq 4. It should instead have donated forwards to subreq 8.

Quoted 5 lines

netfs_sreq: R=0000290e[4] DOWN IO f=02 s=86100000 100000/100000 e=0
netfs_sreq: R=0000290e[4] DOWN +DON f=02 s=86000000 300000/300000 e=0
netfs_progress: R=0000290e[04] s=86000000 ct=0/300000 pa=200000/300000 sl=1
netfs_folio: i=f1c2900000000000 ix=86000-861ff read-done
netfs_folio: i=f1c2900000000000 ix=86000-861ff read-unlock

Subreq 4 completed, and with the donation from subreq 2, had sufficient to unlock the second folio. However, it also has some excess from subreq 7 that it can't do anything with - and this gets lost.

Quoted 3 lines

netfs_sreq: R=0000290e[8] DOWN IO f=02 s=86500000 100000/100000 e=0
netfs_progress: R=0000290e[08] s=86500000 ct=0/100000 pa=100000/100000 sl=3
netfs_donate: R=0000290e[08] -> [04] tail-to-prev am=100000

Here's a repeat of the bug: subreq 8 donates to subreq 4, but, again, is not contiguous. As these are happening concurrently, the other thread hasn't delisted subreq 4 yet.

Quoted 2 lines

netfs_sreq: R=0000290e[4] DOWN +DON f=02 s=86000000 400000/400000 e=0
netfs_progress: R=0000290e[04] s=86200000 ct=200000/400000 pa=200000/200000 sl=2

The request screwed at this point: subreq 4 shows the extra stuff it has been donated, but it is unable to do anything with it. There is no folio to wrangle as the third slot (sl=2) in the queue has already been cleared.

Quoted 6 lines

(Note that this bug shouldn't happen with the patches currently on my netfs-writeback branch as I got rid of the donation mechanism in preference for something simpler with single-threaded collection.)

David

Hi David,

Quoted 8 lines

Tried your submitted patch "netfs: Fix non-contiguous donation between completed reads" with the same workload.
It seems to be crashing elsewhere. I'm trying to get the OOPS message and ftrace, but it seems to be crashing the kernel.

--
Regards,
Shyam

Here's what I managed to get before the VM crashed:

[Wed Dec  4 16:27:10 2024] BUG: kernel NULL pointer dereference,
address: 0000000000000068
[Wed Dec  4 16:27:10 2024] #PF: supervisor read access in kernel mode
[Wed Dec  4 16:27:10 2024] #PF: error_code(0x0000) - not-present page
[Wed Dec  4 16:27:10 2024] PGD 0 P4D 0
[Wed Dec  4 16:27:10 2024] Oops: Oops: 0000 [#1] SMP PTI
[Wed Dec  4 16:27:10 2024] CPU: 6 UID: 0 PID: 1263 Comm: kworker/6:3
Tainted: G           OE      6.12.0-mainline #10
[Wed Dec  4 16:27:10 2024] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
[Wed Dec  4 16:27:10 2024] Hardware name: Microsoft Corporation
Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1
08/23/2024
[Wed Dec  4 16:27:10 2024] Workqueue: cifsiod smb2_readv_worker [cifs]
[Wed Dec  4 16:27:10 2024] RIP:
0010:netfs_consume_read_data.isra.0+0x2d6/0xbe0 [netfs]
[Wed Dec  4 16:27:10 2024] Code: 48 8b 43 78 4c 8b 7d c0 4c 8b 43 68
48 85 c0 0f 85 76 05 00 00 48 8b 55 90 48 8b 73 30 48 83 c2 70 48 39
d6 74 16 48 8b 7d 88 <48> 8b 4f 68 48 03 4f 60 48 39 4b 60 0f 84 58 06
00 00 49 29 c0 48
[Wed Dec  4 16:27:10 2024] RSP: 0018:ffffad4a4582bd98 EFLAGS: 00010283
[Wed Dec  4 16:27:10 2024] RAX: 0000000000000000 RBX: ffff9810d6ff6280
RCX: 0000000000100000
[Wed Dec  4 16:27:10 2024] RDX: ffff981154071eb0 RSI: ffff9810d6ff71a8
RDI: 0000000000000000
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged
CPU for >10000us 4 times, consider switching to WQ_UNBOUND
[Wed Dec  4 16:27:10 2024] RBP: ffffad4a4582be10 R08: 0000000000100000
R09: 0000000000000000
[Wed Dec  4 16:27:10 2024] R10: 0000000000000008 R11: fefefefefefefeff
R12: 0000000000000000
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged
CPU for >10000us 5 times, consider switching to WQ_UNBOUND
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged
CPU for >10000us 7 times, consider switching to WQ_UNBOUND
[Wed Dec  4 16:27:10 2024] R13: ffff981154072028 R14: 0000000000200000
R15: ffff981154072028
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged

CPU for >10000us 11 times, consider switching to WQ_UNBOUND

--
Regards,
Shyam

Ack. Will check further on this today.

Signature · 2 lines
Regards,
Shyam
#12 lore raw
Quoted 174 lines · Shyam Prasad N
Quoted 171 lines · ronnie sahlberg

If you run the kernel under gdb and set a breakpoint on panic you should be able to see the exact line where it failedand you will also be able to check the variables and what they are set to.

Quoted 165 lines · Shyam Prasad N
Quoted 108 lines · Shyam Prasad N
Quoted 97 lines · David Howells

Okay, I think I see the problem.

Looking at the following extraction from the trace:

Quoted 6 lines

netfs_rreq_ref: R=0000290e NEW r=1
netfs_read: R=0000290e READAHEAD c=00000000 ni=0 s=85e00000 l=800000 sz=280000000
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read
netfs_folio: i=f1c2900000000000 ix=86000-861ff read
netfs_folio: i=f1c2900000000000 ix=86200-863ff read
netfs_folio: i=f1c2900000000000 ix=86400-865ff read

We're requesting reads of four folios, each consisting of 512 pages for a total of 8MiB.

Quoted 8 lines

netfs_sreq: R=0000290e[1] DOWN SUBMT f=02 s=85e00000 0/100000 e=0
netfs_sreq: R=0000290e[2] DOWN SUBMT f=02 s=85f00000 0/100000 e=0
netfs_sreq: R=0000290e[3] DOWN SUBMT f=02 s=86000000 0/100000 e=0
netfs_sreq: R=0000290e[4] DOWN SUBMT f=02 s=86100000 0/100000 e=0
netfs_sreq: R=0000290e[5] DOWN SUBMT f=02 s=86200000 0/100000 e=0
netfs_sreq: R=0000290e[6] DOWN SUBMT f=02 s=86300000 0/100000 e=0
netfs_sreq: R=0000290e[7] DOWN SUBMT f=02 s=86400000 0/100000 e=0
netfs_sreq: R=0000290e[8] DOWN SUBMT f=02 s=86500000 0/100000 e=0

That got broken down into 8 submissions, each for a 1MiB slice.

Quoted 3 lines

netfs_sreq: R=0000290e[1] DOWN IO f=02 s=85e00000 100000/100000 e=0
netfs_progress: R=0000290e[01] s=85e00000 ct=0/100000 pa=100000/100000 sl=0
netfs_donate: R=0000290e[01] -> [02] to-next am=100000

Subrequest 1 completed, but wasn't large enough to cover a whole folio, so it donated its coverage forwards to subreq 2.

Quoted 3 lines

netfs_sreq: R=0000290e[6] DOWN IO f=02 s=86300000 100000/100000 e=0
netfs_progress: R=0000290e[06] s=86300000 ct=0/100000 pa=100000/100000 sl=2
netfs_donate: R=0000290e[06] -> [05] tail-to-prev am=100000

Subrequest 6 completed, but wasn't large enough to cover a whole folio, so it donated its coverage backwards to subreq 5.

Quoted 4 lines

netfs_sreq: R=0000290e[2] DOWN IO f=02 s=85f00000 100000/100000 e=0
netfs_progress: R=0000290e[02] s=85e00000 ct=0/200000 pa=200000/200000 sl=0
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read-done
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read-unlock

Subreq 2 completed, and with the donation from subreq 1, had sufficient to unlock the first folio.

Quoted 4 lines

netfs_sreq: R=0000290e[5] DOWN IO f=02 s=86200000 100000/100000 e=0
netfs_progress: R=0000290e[05] s=86200000 ct=0/200000 pa=200000/200000 sl=2
netfs_folio: i=f1c2900000000000 ix=86200-863ff read-done
netfs_folio: i=f1c2900000000000 ix=86200-863ff read-unlock

Subreq 5 completed, and with the donation from subreq 6, had sufficient to unlock the third folio.

Quoted 3 lines

netfs_sreq: R=0000290e[3] DOWN IO f=02 s=86000000 100000/100000 e=0
netfs_progress: R=0000290e[03] s=86000000 ct=0/100000 pa=100000/100000 sl=1
netfs_donate: R=0000290e[03] -> [04] to-next am=100000

Subrequest 3 completed, but wasn't large enough to cover a whole folio, so it donated its coverage forwards to subreq 4. So far, so good.

Quoted 3 lines

netfs_sreq: R=0000290e[7] DOWN IO f=02 s=86400000 100000/100000 e=0
netfs_progress: R=0000290e[07] s=86400000 ct=0/100000 pa=100000/100000 sl=3
netfs_donate: R=0000290e[07] -> [04] to-prev am=0

Subreq 7 completed, but wasn't large enough to cover a whole folio, so it donated its coverage backwards to subreq 4. This is a bug as subreq 7 is not contiguous with subreq 4. It should instead have donated forwards to subreq 8.

Quoted 5 lines

netfs_sreq: R=0000290e[4] DOWN IO f=02 s=86100000 100000/100000 e=0
netfs_sreq: R=0000290e[4] DOWN +DON f=02 s=86000000 300000/300000 e=0
netfs_progress: R=0000290e[04] s=86000000 ct=0/300000 pa=200000/300000 sl=1
netfs_folio: i=f1c2900000000000 ix=86000-861ff read-done
netfs_folio: i=f1c2900000000000 ix=86000-861ff read-unlock

Subreq 4 completed, and with the donation from subreq 2, had sufficient to unlock the second folio. However, it also has some excess from subreq 7 that it can't do anything with - and this gets lost.

Quoted 3 lines

netfs_sreq: R=0000290e[8] DOWN IO f=02 s=86500000 100000/100000 e=0
netfs_progress: R=0000290e[08] s=86500000 ct=0/100000 pa=100000/100000 sl=3
netfs_donate: R=0000290e[08] -> [04] tail-to-prev am=100000

Here's a repeat of the bug: subreq 8 donates to subreq 4, but, again, is not contiguous. As these are happening concurrently, the other thread hasn't delisted subreq 4 yet.

Quoted 2 lines

netfs_sreq: R=0000290e[4] DOWN +DON f=02 s=86000000 400000/400000 e=0
netfs_progress: R=0000290e[04] s=86200000 ct=200000/400000 pa=200000/200000 sl=2

The request screwed at this point: subreq 4 shows the extra stuff it has been donated, but it is unable to do anything with it. There is no folio to wrangle as the third slot (sl=2) in the queue has already been cleared.

Quoted 6 lines

(Note that this bug shouldn't happen with the patches currently on my netfs-writeback branch as I got rid of the donation mechanism in preference for something simpler with single-threaded collection.)

David

Hi David,

Quoted 8 lines

Tried your submitted patch "netfs: Fix non-contiguous donation between completed reads" with the same workload.
It seems to be crashing elsewhere. I'm trying to get the OOPS message and ftrace, but it seems to be crashing the kernel.

--
Regards,
Shyam

Here's what I managed to get before the VM crashed:

[Wed Dec  4 16:27:10 2024] BUG: kernel NULL pointer dereference,
address: 0000000000000068
[Wed Dec  4 16:27:10 2024] #PF: supervisor read access in kernel mode
[Wed Dec  4 16:27:10 2024] #PF: error_code(0x0000) - not-present page
[Wed Dec  4 16:27:10 2024] PGD 0 P4D 0
[Wed Dec  4 16:27:10 2024] Oops: Oops: 0000 [#1] SMP PTI
[Wed Dec  4 16:27:10 2024] CPU: 6 UID: 0 PID: 1263 Comm: kworker/6:3
Tainted: G           OE      6.12.0-mainline #10
[Wed Dec  4 16:27:10 2024] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
[Wed Dec  4 16:27:10 2024] Hardware name: Microsoft Corporation
Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1
08/23/2024
[Wed Dec  4 16:27:10 2024] Workqueue: cifsiod smb2_readv_worker [cifs]
[Wed Dec  4 16:27:10 2024] RIP:
0010:netfs_consume_read_data.isra.0+0x2d6/0xbe0 [netfs]
[Wed Dec  4 16:27:10 2024] Code: 48 8b 43 78 4c 8b 7d c0 4c 8b 43 68
48 85 c0 0f 85 76 05 00 00 48 8b 55 90 48 8b 73 30 48 83 c2 70 48 39
d6 74 16 48 8b 7d 88 <48> 8b 4f 68 48 03 4f 60 48 39 4b 60 0f 84 58 06
00 00 49 29 c0 48
[Wed Dec  4 16:27:10 2024] RSP: 0018:ffffad4a4582bd98 EFLAGS: 00010283
[Wed Dec  4 16:27:10 2024] RAX: 0000000000000000 RBX: ffff9810d6ff6280
RCX: 0000000000100000
[Wed Dec  4 16:27:10 2024] RDX: ffff981154071eb0 RSI: ffff9810d6ff71a8
RDI: 0000000000000000
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged
CPU for >10000us 4 times, consider switching to WQ_UNBOUND
[Wed Dec  4 16:27:10 2024] RBP: ffffad4a4582be10 R08: 0000000000100000
R09: 0000000000000000
[Wed Dec  4 16:27:10 2024] R10: 0000000000000008 R11: fefefefefefefeff
R12: 0000000000000000
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged
CPU for >10000us 5 times, consider switching to WQ_UNBOUND
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged
CPU for >10000us 7 times, consider switching to WQ_UNBOUND
[Wed Dec  4 16:27:10 2024] R13: ffff981154072028 R14: 0000000000200000
R15: ffff981154072028
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged

CPU for >10000us 11 times, consider switching to WQ_UNBOUND

--
Regards,
Shyam

Quoted 5 lines

Ack. Will check further on this today.

--
Regards,
Shyam

Hi David,

Here's the output that I get with your patch. This null-ptr deref crashes the kernel. Even with KASAN enabled, I do not see anything significantly different:

[Thu Dec  5 09:55:18 2024] Oops: general protection fault, probably
for non-canonical address 0xdffffc000000000c: 0000 [#1] SMP KASAN PTI
[Thu Dec  5 09:55:18 2024] KASAN: null-ptr-deref in range
[0x0000000000000060-0x0000000000000067]
[Thu Dec  5 09:55:18 2024] CPU: 12 UID: 0 PID: 175 Comm: kworker/12:1
Not tainted 6.13.0-rc1-wkasan #12
[Thu Dec  5 09:55:18 2024] Hardware name: Microsoft Corporation
Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1
08/23/2024
[Thu Dec  5 09:55:18 2024] Workqueue: cifsiod smb2_readv_worker [cifs]
[Thu Dec  5 09:55:18 2024] RIP:
0010:netfs_consume_read_data.isra.0+0x74e/0x2a80 [netfs]
[Thu Dec  5 09:55:18 2024] Code: 80 3c 02 00 0f 85 aa 20 00 00 48 8b
85 38 ff ff ff 49 8b 4d 60 48 8d 78 60 48 b8 00 00 00 00 00 fc ff df
48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 0f 21 00 00 48 8b 85 38 ff ff
ff 48 8d 78 68 4c
[Thu Dec  5 09:55:18 2024] RSP: 0018:ffff8881039cfc10 EFLAGS: 00010206
[Thu Dec  5 09:55:18 2024] RAX: dffffc0000000000 RBX: 0000000000100000
RCX: 0000000002400000
[Thu Dec  5 09:55:18 2024] RDX: 000000000000000c RSI: 0000000000000000
RDI: 0000000000000060
[Thu Dec  5 09:55:18 2024] RBP: ffff8881039cfcf0 R08: 0000000000000001
R09: ffffed1020739f76
[Thu Dec  5 09:55:18 2024] R10: 0000000000000003 R11: fefefefefefefeff
R12: ffff88815fcb8c28
[Thu Dec  5 09:55:18 2024] R13: ffff88815fcb8d80 R14: ffff88813ce6fbf0
R15: ffff88813ce6fd68
[Thu Dec  5 09:55:18 2024] FS:  0000000000000000(0000)
GS:ffff889fb2e00000(0000) knlGS:0000000000000000
[Thu Dec  5 09:55:18 2024] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Thu Dec  5 09:55:18 2024] CR2: 0000791b35f99018 CR3: 0000000189996002
CR4: 00000000003706f0
[Thu Dec  5 09:55:18 2024] DR0: 0000000000000000 DR1: 0000000000000000
DR2: 0000000000000000
[Thu Dec  5 09:55:18 2024] DR3: 0000000000000000 DR6: 00000000fffe0ff0
DR7: 0000000000000400
[Thu Dec  5 09:55:18 2024] Call Trace:
[Thu Dec  5 09:55:18 2024]  <TASK>
[Thu Dec  5 09:55:18 2024]  ? show_regs+0x64/0x70
[Thu Dec  5 09:55:18 2024]  ? die_addr+0x41/0xb0
[Thu Dec  5 09:55:18 2024]  ? exc_general_protection+0x163/0x250
[Thu Dec  5 09:55:18 2024]  ? asm_exc_general_protection+0x27/0x30
[Thu Dec  5 09:55:18 2024]  ?
netfs_consume_read_data.isra.0+0x74e/0x2a80 [netfs]
[Thu Dec  5 09:55:18 2024]  netfs_read_subreq_terminated+0x928/0xec0 [netfs]
[Thu Dec  5 09:55:18 2024]  ? __pfx___schedule+0x10/0x10
[Thu Dec  5 09:55:18 2024]  ? __pfx__raw_spin_lock_irq+0x10/0x10
[Thu Dec  5 09:55:18 2024]  smb2_readv_worker+0x4b/0x60 [cifs]
[Thu Dec  5 09:55:18 2024]  process_one_work+0x5f3/0xe00
[Thu Dec  5 09:55:18 2024]  ? __kasan_check_write+0x14/0x20
[Thu Dec  5 09:55:18 2024]  worker_thread+0x87c/0x1540
[Thu Dec  5 09:55:18 2024]  ? _raw_spin_lock_irqsave+0x81/0xe0
[Thu Dec  5 09:55:18 2024]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10
[Thu Dec  5 09:55:18 2024]  ? __pfx_worker_thread+0x10/0x10
[Thu Dec  5 09:55:18 2024]  kthread+0x2a2/0x370
[Thu Dec  5 09:55:18 2024]  ? __pfx_kthread+0x10/0x10
[Thu Dec  5 09:55:18 2024]  ret_from_fork+0x3d/0x80
[Thu Dec  5 09:55:18 2024]  ? __pfx_kthread+0x10/0x10
[Thu Dec  5 09:55:18 2024]  ret_from_fork_asm+0x1a/0x30
[Thu Dec  5 09:55:18 2024]  </TASK>
[Thu Dec  5 09:55:18 2024] Modules linked in: cmac nls_utf8 cifs

cifs_arc4 nls_ucs2_utils cifs_md4 netfs mptcp_diag xsk_diag raw_diag unix_diag af_packet_diag netlink_diag udp_diag tcp_diag inet_diag qrtr cfg80211 8021q garp mrp stp llc xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_owner xt_tcpudp nft_compat nf_tables binfmt_misc mlx5_ib ib_uverbs macsec ib_core nls_iso8859_1 intel_rapl_msr intel_rapl_common intel_uncore_frequency_common btrfs isst_if_common blake2b_generic xor mlx5_core mlxfw psample tls joydev mac_hid serio_raw raid6_pq hid_generic skx_edac_common libcrc32c crct10dif_pclmul crc32_pclmul polyval_clmulni polyval_generic ghash_clmulni_intel sha256_ssse3 sha1_ssse3 aesni_intel crypto_simd cryptd rapl hid_hyperv hyperv_drm vmgenid hyperv_keyboard hid hv_netvsc hyperv_fb sch_fq_codel dm_multipath msr nvme_fabrics efi_pstore nfnetlink ip_tables x_tables autofs4

[Thu Dec  5 09:55:18 2024] ---[ end trace 0000000000000000 ]---

RIP shows as the changed line with the patch:
(gdb) l *(netfs_consume_read_data+0x74e)
0x228be is in netfs_consume_read_data (fs/netfs/read_collect.c:260).
255 * donation and should be able to unlock folios and/or
donate nextwards.
256 */
257 if (!subreq->consumed &&

258                 !prev_donated &&
259                 !list_is_first(&subreq->rreq_link, &rreq->subrequests) &&
260                 subreq->start == prev->start + prev->len) {

<<<<<<<<<<<<<<<<<<<
261 prev = list_prev_entry(subreq, rreq_link);
262 WRITE_ONCE(prev->next_donated,
prev->next_donated + subreq->len);
263 subreq->start += subreq->len;
264 subreq->len = 0;

Signature · 2 lines
Regards,
Shyam
#13 lore raw
Quoted 281 lines · Shyam Prasad N
Quoted 174 lines · Shyam Prasad N
Quoted 171 lines · ronnie sahlberg

If you run the kernel under gdb and set a breakpoint on panic you should be able to see the exact line where it failedand you will also be able to check the variables and what they are set to.

Quoted 165 lines · Shyam Prasad N
Quoted 108 lines · Shyam Prasad N
Quoted 97 lines · David Howells

Okay, I think I see the problem.

Looking at the following extraction from the trace:

Quoted 6 lines

netfs_rreq_ref: R=0000290e NEW r=1
netfs_read: R=0000290e READAHEAD c=00000000 ni=0 s=85e00000 l=800000 sz=280000000
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read
netfs_folio: i=f1c2900000000000 ix=86000-861ff read
netfs_folio: i=f1c2900000000000 ix=86200-863ff read
netfs_folio: i=f1c2900000000000 ix=86400-865ff read

We're requesting reads of four folios, each consisting of 512 pages for a total of 8MiB.

Quoted 8 lines

netfs_sreq: R=0000290e[1] DOWN SUBMT f=02 s=85e00000 0/100000 e=0
netfs_sreq: R=0000290e[2] DOWN SUBMT f=02 s=85f00000 0/100000 e=0
netfs_sreq: R=0000290e[3] DOWN SUBMT f=02 s=86000000 0/100000 e=0
netfs_sreq: R=0000290e[4] DOWN SUBMT f=02 s=86100000 0/100000 e=0
netfs_sreq: R=0000290e[5] DOWN SUBMT f=02 s=86200000 0/100000 e=0
netfs_sreq: R=0000290e[6] DOWN SUBMT f=02 s=86300000 0/100000 e=0
netfs_sreq: R=0000290e[7] DOWN SUBMT f=02 s=86400000 0/100000 e=0
netfs_sreq: R=0000290e[8] DOWN SUBMT f=02 s=86500000 0/100000 e=0

That got broken down into 8 submissions, each for a 1MiB slice.

Quoted 3 lines

netfs_sreq: R=0000290e[1] DOWN IO f=02 s=85e00000 100000/100000 e=0
netfs_progress: R=0000290e[01] s=85e00000 ct=0/100000 pa=100000/100000 sl=0
netfs_donate: R=0000290e[01] -> [02] to-next am=100000

Subrequest 1 completed, but wasn't large enough to cover a whole folio, so it donated its coverage forwards to subreq 2.

Quoted 3 lines

netfs_sreq: R=0000290e[6] DOWN IO f=02 s=86300000 100000/100000 e=0
netfs_progress: R=0000290e[06] s=86300000 ct=0/100000 pa=100000/100000 sl=2
netfs_donate: R=0000290e[06] -> [05] tail-to-prev am=100000

Subrequest 6 completed, but wasn't large enough to cover a whole folio, so it donated its coverage backwards to subreq 5.

Quoted 4 lines

netfs_sreq: R=0000290e[2] DOWN IO f=02 s=85f00000 100000/100000 e=0
netfs_progress: R=0000290e[02] s=85e00000 ct=0/200000 pa=200000/200000 sl=0
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read-done
netfs_folio: i=f1c2900000000000 ix=85e00-85fff read-unlock

Subreq 2 completed, and with the donation from subreq 1, had sufficient to unlock the first folio.

Quoted 4 lines

netfs_sreq: R=0000290e[5] DOWN IO f=02 s=86200000 100000/100000 e=0
netfs_progress: R=0000290e[05] s=86200000 ct=0/200000 pa=200000/200000 sl=2
netfs_folio: i=f1c2900000000000 ix=86200-863ff read-done
netfs_folio: i=f1c2900000000000 ix=86200-863ff read-unlock

Subreq 5 completed, and with the donation from subreq 6, had sufficient to unlock the third folio.

Quoted 3 lines

netfs_sreq: R=0000290e[3] DOWN IO f=02 s=86000000 100000/100000 e=0
netfs_progress: R=0000290e[03] s=86000000 ct=0/100000 pa=100000/100000 sl=1
netfs_donate: R=0000290e[03] -> [04] to-next am=100000

Subrequest 3 completed, but wasn't large enough to cover a whole folio, so it donated its coverage forwards to subreq 4. So far, so good.

Quoted 3 lines

netfs_sreq: R=0000290e[7] DOWN IO f=02 s=86400000 100000/100000 e=0
netfs_progress: R=0000290e[07] s=86400000 ct=0/100000 pa=100000/100000 sl=3
netfs_donate: R=0000290e[07] -> [04] to-prev am=0

Subreq 7 completed, but wasn't large enough to cover a whole folio, so it donated its coverage backwards to subreq 4. This is a bug as subreq 7 is not contiguous with subreq 4. It should instead have donated forwards to subreq 8.

Quoted 5 lines

netfs_sreq: R=0000290e[4] DOWN IO f=02 s=86100000 100000/100000 e=0
netfs_sreq: R=0000290e[4] DOWN +DON f=02 s=86000000 300000/300000 e=0
netfs_progress: R=0000290e[04] s=86000000 ct=0/300000 pa=200000/300000 sl=1
netfs_folio: i=f1c2900000000000 ix=86000-861ff read-done
netfs_folio: i=f1c2900000000000 ix=86000-861ff read-unlock

Subreq 4 completed, and with the donation from subreq 2, had sufficient to unlock the second folio. However, it also has some excess from subreq 7 that it can't do anything with - and this gets lost.

Quoted 3 lines

netfs_sreq: R=0000290e[8] DOWN IO f=02 s=86500000 100000/100000 e=0
netfs_progress: R=0000290e[08] s=86500000 ct=0/100000 pa=100000/100000 sl=3
netfs_donate: R=0000290e[08] -> [04] tail-to-prev am=100000

Here's a repeat of the bug: subreq 8 donates to subreq 4, but, again, is not contiguous. As these are happening concurrently, the other thread hasn't delisted subreq 4 yet.

Quoted 2 lines

netfs_sreq: R=0000290e[4] DOWN +DON f=02 s=86000000 400000/400000 e=0
netfs_progress: R=0000290e[04] s=86200000 ct=200000/400000 pa=200000/200000 sl=2

The request screwed at this point: subreq 4 shows the extra stuff it has been donated, but it is unable to do anything with it. There is no folio to wrangle as the third slot (sl=2) in the queue has already been cleared.

Quoted 6 lines

(Note that this bug shouldn't happen with the patches currently on my netfs-writeback branch as I got rid of the donation mechanism in preference for something simpler with single-threaded collection.)

David

Hi David,

Quoted 8 lines

Tried your submitted patch "netfs: Fix non-contiguous donation between completed reads" with the same workload.
It seems to be crashing elsewhere. I'm trying to get the OOPS message and ftrace, but it seems to be crashing the kernel.

--
Regards,
Shyam

Here's what I managed to get before the VM crashed:

[Wed Dec  4 16:27:10 2024] BUG: kernel NULL pointer dereference,
address: 0000000000000068
[Wed Dec  4 16:27:10 2024] #PF: supervisor read access in kernel mode
[Wed Dec  4 16:27:10 2024] #PF: error_code(0x0000) - not-present page
[Wed Dec  4 16:27:10 2024] PGD 0 P4D 0
[Wed Dec  4 16:27:10 2024] Oops: Oops: 0000 [#1] SMP PTI
[Wed Dec  4 16:27:10 2024] CPU: 6 UID: 0 PID: 1263 Comm: kworker/6:3
Tainted: G           OE      6.12.0-mainline #10
[Wed Dec  4 16:27:10 2024] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
[Wed Dec  4 16:27:10 2024] Hardware name: Microsoft Corporation
Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1
08/23/2024
[Wed Dec  4 16:27:10 2024] Workqueue: cifsiod smb2_readv_worker [cifs]
[Wed Dec  4 16:27:10 2024] RIP:
0010:netfs_consume_read_data.isra.0+0x2d6/0xbe0 [netfs]
[Wed Dec  4 16:27:10 2024] Code: 48 8b 43 78 4c 8b 7d c0 4c 8b 43 68
48 85 c0 0f 85 76 05 00 00 48 8b 55 90 48 8b 73 30 48 83 c2 70 48 39
d6 74 16 48 8b 7d 88 <48> 8b 4f 68 48 03 4f 60 48 39 4b 60 0f 84 58 06
00 00 49 29 c0 48
[Wed Dec  4 16:27:10 2024] RSP: 0018:ffffad4a4582bd98 EFLAGS: 00010283
[Wed Dec  4 16:27:10 2024] RAX: 0000000000000000 RBX: ffff9810d6ff6280
RCX: 0000000000100000
[Wed Dec  4 16:27:10 2024] RDX: ffff981154071eb0 RSI: ffff9810d6ff71a8
RDI: 0000000000000000
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged
CPU for >10000us 4 times, consider switching to WQ_UNBOUND
[Wed Dec  4 16:27:10 2024] RBP: ffffad4a4582be10 R08: 0000000000100000
R09: 0000000000000000
[Wed Dec  4 16:27:10 2024] R10: 0000000000000008 R11: fefefefefefefeff
R12: 0000000000000000
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged
CPU for >10000us 5 times, consider switching to WQ_UNBOUND
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged
CPU for >10000us 7 times, consider switching to WQ_UNBOUND
[Wed Dec  4 16:27:10 2024] R13: ffff981154072028 R14: 0000000000200000
R15: ffff981154072028
[Wed Dec  4 16:27:10 2024] workqueue: smb2_readv_worker [cifs] hogged

CPU for >10000us 11 times, consider switching to WQ_UNBOUND

--
Regards,
Shyam

Quoted 5 lines

Ack. Will check further on this today.

--
Regards,
Shyam

Hi David,

Here's the output that I get with your patch. This null-ptr deref crashes the kernel. Even with KASAN enabled, I do not see anything significantly different:

[Thu Dec  5 09:55:18 2024] Oops: general protection fault, probably
for non-canonical address 0xdffffc000000000c: 0000 [#1] SMP KASAN PTI
[Thu Dec  5 09:55:18 2024] KASAN: null-ptr-deref in range
[0x0000000000000060-0x0000000000000067]
[Thu Dec  5 09:55:18 2024] CPU: 12 UID: 0 PID: 175 Comm: kworker/12:1
Not tainted 6.13.0-rc1-wkasan #12
[Thu Dec  5 09:55:18 2024] Hardware name: Microsoft Corporation
Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1
08/23/2024
[Thu Dec  5 09:55:18 2024] Workqueue: cifsiod smb2_readv_worker [cifs]
[Thu Dec  5 09:55:18 2024] RIP:
0010:netfs_consume_read_data.isra.0+0x74e/0x2a80 [netfs]
[Thu Dec  5 09:55:18 2024] Code: 80 3c 02 00 0f 85 aa 20 00 00 48 8b
85 38 ff ff ff 49 8b 4d 60 48 8d 78 60 48 b8 00 00 00 00 00 fc ff df
48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 0f 21 00 00 48 8b 85 38 ff ff
ff 48 8d 78 68 4c
[Thu Dec  5 09:55:18 2024] RSP: 0018:ffff8881039cfc10 EFLAGS: 00010206
[Thu Dec  5 09:55:18 2024] RAX: dffffc0000000000 RBX: 0000000000100000
RCX: 0000000002400000
[Thu Dec  5 09:55:18 2024] RDX: 000000000000000c RSI: 0000000000000000
RDI: 0000000000000060
[Thu Dec  5 09:55:18 2024] RBP: ffff8881039cfcf0 R08: 0000000000000001
R09: ffffed1020739f76
[Thu Dec  5 09:55:18 2024] R10: 0000000000000003 R11: fefefefefefefeff
R12: ffff88815fcb8c28
[Thu Dec  5 09:55:18 2024] R13: ffff88815fcb8d80 R14: ffff88813ce6fbf0
R15: ffff88813ce6fd68
[Thu Dec  5 09:55:18 2024] FS:  0000000000000000(0000)
GS:ffff889fb2e00000(0000) knlGS:0000000000000000
[Thu Dec  5 09:55:18 2024] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Thu Dec  5 09:55:18 2024] CR2: 0000791b35f99018 CR3: 0000000189996002
CR4: 00000000003706f0
[Thu Dec  5 09:55:18 2024] DR0: 0000000000000000 DR1: 0000000000000000
DR2: 0000000000000000
[Thu Dec  5 09:55:18 2024] DR3: 0000000000000000 DR6: 00000000fffe0ff0
DR7: 0000000000000400
[Thu Dec  5 09:55:18 2024] Call Trace:
[Thu Dec  5 09:55:18 2024]  <TASK>
[Thu Dec  5 09:55:18 2024]  ? show_regs+0x64/0x70
[Thu Dec  5 09:55:18 2024]  ? die_addr+0x41/0xb0
[Thu Dec  5 09:55:18 2024]  ? exc_general_protection+0x163/0x250
[Thu Dec  5 09:55:18 2024]  ? asm_exc_general_protection+0x27/0x30
[Thu Dec  5 09:55:18 2024]  ?
netfs_consume_read_data.isra.0+0x74e/0x2a80 [netfs]
[Thu Dec  5 09:55:18 2024]  netfs_read_subreq_terminated+0x928/0xec0 [netfs]
[Thu Dec  5 09:55:18 2024]  ? __pfx___schedule+0x10/0x10
[Thu Dec  5 09:55:18 2024]  ? __pfx__raw_spin_lock_irq+0x10/0x10
[Thu Dec  5 09:55:18 2024]  smb2_readv_worker+0x4b/0x60 [cifs]
[Thu Dec  5 09:55:18 2024]  process_one_work+0x5f3/0xe00
[Thu Dec  5 09:55:18 2024]  ? __kasan_check_write+0x14/0x20
[Thu Dec  5 09:55:18 2024]  worker_thread+0x87c/0x1540
[Thu Dec  5 09:55:18 2024]  ? _raw_spin_lock_irqsave+0x81/0xe0
[Thu Dec  5 09:55:18 2024]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10
[Thu Dec  5 09:55:18 2024]  ? __pfx_worker_thread+0x10/0x10
[Thu Dec  5 09:55:18 2024]  kthread+0x2a2/0x370
[Thu Dec  5 09:55:18 2024]  ? __pfx_kthread+0x10/0x10
[Thu Dec  5 09:55:18 2024]  ret_from_fork+0x3d/0x80
[Thu Dec  5 09:55:18 2024]  ? __pfx_kthread+0x10/0x10
[Thu Dec  5 09:55:18 2024]  ret_from_fork_asm+0x1a/0x30
[Thu Dec  5 09:55:18 2024]  </TASK>
[Thu Dec  5 09:55:18 2024] Modules linked in: cmac nls_utf8 cifs

cifs_arc4 nls_ucs2_utils cifs_md4 netfs mptcp_diag xsk_diag raw_diag unix_diag af_packet_diag netlink_diag udp_diag tcp_diag inet_diag qrtr cfg80211 8021q garp mrp stp llc xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_owner xt_tcpudp nft_compat nf_tables binfmt_misc mlx5_ib ib_uverbs macsec ib_core nls_iso8859_1 intel_rapl_msr intel_rapl_common intel_uncore_frequency_common btrfs isst_if_common blake2b_generic xor mlx5_core mlxfw psample tls joydev mac_hid serio_raw raid6_pq hid_generic skx_edac_common libcrc32c crct10dif_pclmul crc32_pclmul polyval_clmulni polyval_generic ghash_clmulni_intel sha256_ssse3 sha1_ssse3 aesni_intel crypto_simd cryptd rapl hid_hyperv hyperv_drm vmgenid hyperv_keyboard hid hv_netvsc hyperv_fb sch_fq_codel dm_multipath msr nvme_fabrics efi_pstore nfnetlink ip_tables x_tables autofs4

[Thu Dec  5 09:55:18 2024] ---[ end trace 0000000000000000 ]---

RIP shows as the changed line with the patch:
(gdb) l *(netfs_consume_read_data+0x74e)
0x228be is in netfs_consume_read_data (fs/netfs/read_collect.c:260).
255 * donation and should be able to unlock folios and/or
donate nextwards.
256 */
257 if (!subreq->consumed &&

258                 !prev_donated &&
259                 !list_is_first(&subreq->rreq_link, &rreq->subrequests) &&
260                 subreq->start == prev->start + prev->len) {

<<<<<<<<<<<<<<<<<<<
261 prev = list_prev_entry(subreq, rreq_link);
262 WRITE_ONCE(prev->next_donated,
prev->next_donated + subreq->len);
263 subreq->start += subreq->len;
264 subreq->len = 0;

Quoted 3 lines

--
Regards,
Shyam

Hi David,

I tried this again with 6.13-rc1 and the null-ptr deref seems to be slightly different (same function).
It is taking me some time due to unfamiliarity of the code. Maybe you'll get it sooner.
We're trying to see if we can hook gdb when this happens. More details on that tomorrow.

Signature · 2 lines
Regards,
Shyam
[Wed Jan 22 10:39:39 2025] ------------[ cut here ]------------
[Wed Jan 22 10:39:39 2025] WARNING: CPU: 4 PID: 571 at fs/netfs/read_collect.c:110 netfs_consume_read_data.isra.0+0x596/0x900 [netfs]
[Wed Jan 22 10:39:39 2025] Modules linked in: cmac nls_utf8 cifs cifs_arc4 nls_ucs2_utils cifs_md4 netfs qrtr cfg80211 8021q garp mrp stp llc xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_owner xt_tcpudp nft_compat nf_tables binfmt_misc nls_iso8859_1 intel_rapl_msr intel_rapl_common intel_uncore_frequency_common isst_if_common skx_edac_common nfit rapl vmgenid hyperv_drm hv_balloon joydev serio_raw mac_hid sch_fq_codel dm_multipath nvme_fabrics nvme_keyring msr nvme_core nvme_auth efi_pstore nfnetlink dmi_sysfs ip_tables x_tables autofs4 btrfs blake2b_generic raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 mlx5_ib ib_uverbs macsec ib_core mlx5_core mlxfw psample tls pci_hyperv pci_hyperv_intf hid_generic hv_storvsc hid_hyperv hid hv_netvsc scsi_transport_fc hyperv_fb hv_utils hyperv_keyboard crct10dif_pclmul crc32_pclmul polyval_clmulni polyval_generic ghash_clmulni_intel sha256_ssse3 sha1_ssse3 hv_vmbus aesni_intel crypto_simd cryptd
[Wed Jan 22 10:39:39 2025] CPU: 4 UID: 0 PID: 571 Comm: kworker/4:2 Not tainted 6.13.0-061300rc1-generic #202412012327
[Wed Jan 22 10:39:39 2025] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 08/23/2024
[Wed Jan 22 10:39:39 2025] Workqueue: cifsiod smb2_readv_worker [cifs]
[Wed Jan 22 10:39:39 2025] RIP: 0010:netfs_consume_read_data.isra.0+0x596/0x900 [netfs]
[Wed Jan 22 10:39:39 2025] Code: 48 8b 75 90 48 8d 4a d8 45 31 c9 48 89 da e8 a1 a3 ff ff 65 ff 0d b2 f9 0c 3f 0f 85 03 ff ff ff 0f 1f 44 00 00 e9 f9 fe ff ff <0f> 0b 48 8b 43 70 48 8b 75 90 4c 89 55 d0 4c 89 f9 8b 7d 9c 0f b7
[Wed Jan 22 10:39:39 2025] RSP: 0018:ffffc17000d9bd90 EFLAGS: 00010246
[Wed Jan 22 10:39:39 2025] RAX: ffff9d030a8dec00 RBX: ffff9d03e60f9a40 RCX: 0000000000000009
[Wed Jan 22 10:39:39 2025] RDX: 0000000002800000 RSI: 0000000000000000 RDI: 0000000000000000
[Wed Jan 22 10:39:39 2025] RBP: ffffc17000d9be00 R08: 0000000000000000 R09: 0000000000200000
[Wed Jan 22 10:39:39 2025] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000
[Wed Jan 22 10:39:39 2025] R13: ffff9d0364c87568 R14: 0000000000200000 R15: 0000000002600000
[Wed Jan 22 10:39:39 2025] FS:  0000000000000000(0000) GS:ffff9d2553600000(0000) knlGS:0000000000000000
[Wed Jan 22 10:39:39 2025] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Wed Jan 22 10:39:39 2025] CR2: 000077cf1deee200 CR3: 00000001062c8005 CR4: 00000000003706f0
[Wed Jan 22 10:39:39 2025] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[Wed Jan 22 10:39:39 2025] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[Wed Jan 22 10:39:39 2025] Call Trace:
[Wed Jan 22 10:39:39 2025]  <TASK>
[Wed Jan 22 10:39:39 2025]  ? show_trace_log_lvl+0x1be/0x310
[Wed Jan 22 10:39:39 2025]  ? show_trace_log_lvl+0x1be/0x310
[Wed Jan 22 10:39:39 2025]  ? netfs_read_subreq_terminated+0x2ce/0x420 [netfs]
[Wed Jan 22 10:39:39 2025]  ? show_regs.part.0+0x22/0x30
[Wed Jan 22 10:39:39 2025]  ? show_regs.cold+0x8/0x10
[Wed Jan 22 10:39:39 2025]  ? netfs_consume_read_data.isra.0+0x596/0x900 [netfs]
[Wed Jan 22 10:39:39 2025]  ? __warn.cold+0xac/0x10c
[Wed Jan 22 10:39:39 2025]  ? netfs_consume_read_data.isra.0+0x596/0x900 [netfs]
[Wed Jan 22 10:39:39 2025]  ? report_bug+0x114/0x160
[Wed Jan 22 10:39:39 2025]  ? handle_bug+0x6e/0xb0
[Wed Jan 22 10:39:39 2025]  ? exc_invalid_op+0x18/0x80
[Wed Jan 22 10:39:39 2025]  ? asm_exc_invalid_op+0x1b/0x20
[Wed Jan 22 10:39:39 2025]  ? netfs_consume_read_data.isra.0+0x596/0x900 [netfs]
[Wed Jan 22 10:39:39 2025]  netfs_read_subreq_terminated+0x2ce/0x420 [netfs]
[Wed Jan 22 10:39:39 2025]  smb2_readv_worker+0x1a/0x30 [cifs]
[Wed Jan 22 10:39:39 2025]  process_one_work+0x177/0x350
[Wed Jan 22 10:39:39 2025]  worker_thread+0x33a/0x470
[Wed Jan 22 10:39:39 2025]  ? _raw_spin_unlock_irqrestore+0x11/0x60
[Wed Jan 22 10:39:39 2025]  ? __pfx_worker_thread+0x10/0x10
[Wed Jan 22 10:39:39 2025]  kthread+0xe4/0x110
[Wed Jan 22 10:39:39 2025]  ? __pfx_kthread+0x10/0x10
[Wed Jan 22 10:39:39 2025]  ret_from_fork+0x47/0x70
[Wed Jan 22 10:39:39 2025]  ? __pfx_kthread+0x10/0x10
[Wed Jan 22 10:39:39 2025]  ret_from_fork_asm+0x1a/0x30
[Wed Jan 22 10:39:39 2025]  </TASK>
[Wed Jan 22 10:39:39 2025] ---[ end trace 0000000000000000 ]---
[Wed Jan 22 10:39:39 2025] netfs: R=00005a08[a] s=2600000-29fffff ctl=200000/400000/400000 sl=5
[Wed Jan 22 10:39:39 2025] netfs: folioq: orders=09090909
[Wed Jan 22 10:39:39 2025] BUG: kernel NULL pointer dereference, address: 0000000000000000
[Wed Jan 22 10:39:39 2025] #PF: supervisor write access in kernel mode
[Wed Jan 22 10:39:39 2025] #PF: error_code(0x0002) - not-present page
[Wed Jan 22 10:39:39 2025] PGD 800000010df9b067 P4D 800000010df9b067 PUD 1029f2067 PMD 0
[Wed Jan 22 10:39:39 2025] Oops: Oops: 0002 [#1] PREEMPT SMP PTI
[Wed Jan 22 10:39:39 2025] CPU: 4 UID: 0 PID: 571 Comm: kworker/4:2 Tainted: G        W          6.13.0-061300rc1-generic #202412012327
[Wed Jan 22 10:39:39 2025] Tainted: [W]=WARN
[Wed Jan 22 10:39:39 2025] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 08/23/2024
[Wed Jan 22 10:39:39 2025] Workqueue: cifsiod smb2_readv_worker [cifs]
[Wed Jan 22 10:39:39 2025] RIP: 0010:netfs_unlock_read_folio+0x34/0x380 [netfs]
[Wed Jan 22 10:39:39 2025] Code: 89 e5 41 57 49 89 ff 41 56 49 89 f6 41 55 41 54 4d 89 c4 53 48 89 d3 48 83 ec 10 41 83 f8 1e 0f 87 17 03 00 00 4e 8b 6c c3 08 <f0> 41 80 4d 00 08 49 8b 86 58 02 00 00 a9 00 00 00 80 0f 85 d8 00
[Wed Jan 22 10:39:39 2025] RSP: 0018:ffffc17000d9bd48 EFLAGS: 00010297
[Wed Jan 22 10:39:39 2025] netfs: R=00005a09[a] s=3600000-38fffff ctl=200000/300000/300000 sl=5
[Wed Jan 22 10:39:39 2025] RAX: 0000000000400000 RBX: ffff9d030a8dec00 RCX: 0000000000000005
[Wed Jan 22 10:39:39 2025] RDX: ffff9d030a8dec00 RSI: ffff9d0364c87380 RDI: ffff9d03e60f9a40
[Wed Jan 22 10:39:39 2025] RBP: ffffc17000d9bd80 R08: 0000000000000005 R09: 0000000000000000
[Wed Jan 22 10:39:39 2025] R10: 0000000000000005 R11: 0000000002800000 R12: 0000000000000005
[Wed Jan 22 10:39:39 2025] R13: 0000000000000000 R14: ffff9d0364c87380 R15: ffff9d03e60f9a40
[Wed Jan 22 10:39:39 2025] FS:  0000000000000000(0000) GS:ffff9d2553600000(0000) knlGS:0000000000000000
[Wed Jan 22 10:39:39 2025] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Wed Jan 22 10:39:39 2025] netfs: folioq: orders=09090909
[Wed Jan 22 10:39:39 2025] CR2: 0000000000000000 CR3: 00000001062c8005 CR4: 00000000003706f0
[Wed Jan 22 10:39:39 2025] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[Wed Jan 22 10:39:39 2025] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[Wed Jan 22 10:39:39 2025] Call Trace:
[Wed Jan 22 10:39:39 2025]  <TASK>
[Wed Jan 22 10:39:39 2025]  ? show_trace_log_lvl+0x1be/0x310
[Wed Jan 22 10:39:39 2025]  ? show_trace_log_lvl+0x1be/0x310
[Wed Jan 22 10:39:39 2025]  ? netfs_consume_read_data.isra.0+0x3ac/0x900 [netfs]
[Wed Jan 22 10:39:39 2025]  ? show_regs.part.0+0x22/0x30
[Wed Jan 22 10:39:39 2025]  ? __die_body.cold+0x8/0x10
[Wed Jan 22 10:39:39 2025]  ? __die+0x2a/0x40
[Wed Jan 22 10:39:39 2025]  ? page_fault_oops+0x16c/0x180
[Wed Jan 22 10:39:39 2025]  ? do_user_addr_fault+0x4c9/0x7e0
[Wed Jan 22 10:39:39 2025]  ? prb_read_valid+0x1c/0x30
[Wed Jan 22 10:39:39 2025]  ? exc_page_fault+0x85/0x1c0
[Wed Jan 22 10:39:39 2025]  ? asm_exc_page_fault+0x27/0x30
[Wed Jan 22 10:39:39 2025]  ? netfs_unlock_read_folio+0x34/0x380 [netfs]
[Wed Jan 22 10:39:39 2025]  netfs_consume_read_data.isra.0+0x3ac/0x900 [netfs]
[Wed Jan 22 10:39:39 2025]  netfs_read_subreq_terminated+0x2ce/0x420 [netfs]
[Wed Jan 22 10:39:39 2025]  smb2_readv_worker+0x1a/0x30 [cifs]
[Wed Jan 22 10:39:39 2025]  process_one_work+0x177/0x350
[Wed Jan 22 10:39:39 2025]  worker_thread+0x33a/0x470
[Wed Jan 22 10:39:39 2025]  ? _raw_spin_unlock_irqrestore+0x11/0x60
[Wed Jan 22 10:39:39 2025]  ? __pfx_worker_thread+0x10/0x10
[Wed Jan 22 10:39:39 2025]  kthread+0xe4/0x110
[Wed Jan 22 10:39:39 2025]  ? __pfx_kthread+0x10/0x10
[Wed Jan 22 10:39:39 2025]  ret_from_fork+0x47/0x70
[Wed Jan 22 10:39:39 2025]  ? __pfx_kthread+0x10/0x10
[Wed Jan 22 10:39:39 2025]  ret_from_fork_asm+0x1a/0x30
[Wed Jan 22 10:39:39 2025]  </TASK>
[Wed Jan 22 10:39:39 2025] Modules linked in: cmac nls_utf8 cifs cifs_arc4 nls_ucs2_utils cifs_md4 netfs qrtr cfg80211 8021q garp mrp stp llc xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_owner xt_tcpudp nft_compat nf_tables binfmt_misc nls_iso8859_1 intel_rapl_msr intel_rapl_common intel_uncore_frequency_common isst_if_common skx_edac_common nfit rapl vmgenid hyperv_drm hv_balloon joydev serio_raw mac_hid sch_fq_codel dm_multipath nvme_fabrics nvme_keyring msr nvme_core nvme_auth efi_pstore nfnetlink dmi_sysfs ip_tables x_tables autofs4 btrfs blake2b_generic raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 mlx5_ib ib_uverbs macsec ib_core mlx5_core mlxfw psample tls pci_hyperv pci_hyperv_intf hid_generic hv_storvsc hid_hyperv hid hv_netvsc scsi_transport_fc hyperv_fb hv_utils hyperv_keyboard crct10dif_pclmul crc32_pclmul polyval_clmulni polyval_generic ghash_clmulni_intel sha256_ssse3 sha1_ssse3 hv_vmbus aesni_intel crypto_simd cryptd
[Wed Jan 22 10:39:39 2025] CR2: 0000000000000000
[Wed Jan 22 10:39:39 2025] BUG: kernel NULL pointer dereference, address: 0000000000000000
[Wed Jan 22 10:39:39 2025] ---[ end trace 0000000000000000 ]---
[Wed Jan 22 10:39:39 2025] #PF: supervisor write access in kernel mode
[Wed Jan 22 10:39:39 2025] #PF: error_code(0x0002) - not-present page
[Wed Jan 22 10:39:39 2025] PGD 800000010df9b067 P4D 800000010df9b067 PUD 1029f2067 PMD 0
[Wed Jan 22 10:39:39 2025] Oops: Oops: 0002 [#2] PREEMPT SMP PTI
[Wed Jan 22 10:39:39 2025] CPU: 18 UID: 0 PID: 489 Comm: kworker/18:2 Tainted: G      D W          6.13.0-061300rc1-generic #202412012327
[Wed Jan 22 10:39:39 2025] Tainted: [D]=DIE, [W]=WARN
[Wed Jan 22 10:39:40 2025] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 08/23/2024
[Wed Jan 22 10:39:40 2025] Workqueue: cifsiod smb2_readv_worker [cifs]
[Wed Jan 22 10:39:40 2025] RIP: 0010:netfs_unlock_read_folio+0x34/0x380 [netfs]
[Wed Jan 22 10:39:40 2025] RIP: 0010:netfs_unlock_read_folio+0x34/0x380 [netfs]
[Wed Jan 22 10:39:40 2025] Code: 89 e5 41 57 49 89 ff 41 56 49 89 f6 41 55 41 54 4d 89 c4 53 48 89 d3 48 83 ec 10 41 83 f8 1e 0f 87 17 03 00 00 4e 8b 6c c3 08 <f0> 41 80 4d 00 08 49 8b 86 58 02 00 00 a9 00 00 00 80 0f 85 d8 00
[Wed Jan 22 10:39:40 2025] Code: 89 e5 41 57 49 89 ff 41 56 49 89 f6 41 55 41 54 4d 89 c4 53 48 89 d3 48 83 ec 10 41 83 f8 1e 0f 87 17 03 00 00 4e 8b 6c c3 08 <f0> 41 80 4d 00 08 49 8b 86 58 02 00 00 a9 00 00 00 80 0f 85 d8 00
[Wed Jan 22 10:39:40 2025] RSP: 0018:ffffc17000d9bd48 EFLAGS: 00010297
[Wed Jan 22 10:39:40 2025] RSP: 0018:ffffc170010f7d48 EFLAGS: 00010297
[Wed Jan 22 10:39:40 2025] RAX: 0000000000400000 RBX: ffff9d030a8dec00 RCX: 0000000000000005
[Wed Jan 22 10:39:40 2025] RAX: 0000000000400000 RBX: ffff9d030a8dd400 RCX: 0000000000000005
[Wed Jan 22 10:39:40 2025] RDX: ffff9d030a8dec00 RSI: ffff9d0364c87380 RDI: ffff9d03e60f9a40
[Wed Jan 22 10:39:40 2025] RDX: ffff9d030a8dd400 RSI: ffff9d0364c85280 RDI: ffff9d03e60f9040
[Wed Jan 22 10:39:40 2025] RBP: ffffc17000d9bd80 R08: 0000000000000005 R09: 0000000000000000
[Wed Jan 22 10:39:40 2025] RBP: ffffc170010f7d80 R08: 0000000000000005 R09: 0000000000000000
[Wed Jan 22 10:39:40 2025] R10: 0000000000000005 R11: 0000000002800000 R12: 0000000000000005
[Wed Jan 22 10:39:40 2025] R10: 0000000000000000 R11: 0000000003800000 R12: 0000000000000005
[Wed Jan 22 10:39:40 2025] R13: 0000000000000000 R14: ffff9d0364c87380 R15: ffff9d03e60f9a40
[Wed Jan 22 10:39:40 2025] R13: 0000000000000000 R14: ffff9d0364c85280 R15: ffff9d03e60f9040
[Wed Jan 22 10:39:40 2025] FS:  0000000000000000(0000) GS:ffff9d2553600000(0000) knlGS:0000000000000000
[Wed Jan 22 10:39:40 2025] FS:  0000000000000000(0000) GS:ffff9d2553d00000(0000) knlGS:0000000000000000
[Wed Jan 22 10:39:40 2025] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Wed Jan 22 10:39:40 2025] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Wed Jan 22 10:39:40 2025] CR2: 0000000000000000 CR3: 00000001062c8005 CR4: 00000000003706f0
[Wed Jan 22 10:39:40 2025] CR2: 0000000000000000 CR3: 00000001062c8003 CR4: 00000000003706f0
[Wed Jan 22 10:39:40 2025] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[Wed Jan 22 10:39:40 2025] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[Wed Jan 22 10:39:40 2025] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[Wed Jan 22 10:39:40 2025] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[Wed Jan 22 10:39:40 2025] note: kworker/4:2[571] exited with irqs disabled
[Wed Jan 22 10:39:40 2025] Call Trace:
[Wed Jan 22 10:39:40 2025]  <TASK>
[Wed Jan 22 10:39:40 2025]  ? show_trace_log_lvl+0x1be/0x310
[Wed Jan 22 10:39:40 2025]  ? show_trace_log_lvl+0x1be/0x310
[Wed Jan 22 10:39:40 2025]  ? netfs_consume_read_data.isra.0+0x3ac/0x900 [netfs]
[Wed Jan 22 10:39:40 2025]  ? show_regs.part.0+0x22/0x30
[Wed Jan 22 10:39:40 2025]  ? __die_body.cold+0x8/0x10
[Wed Jan 22 10:39:40 2025]  ? __die+0x2a/0x40
[Wed Jan 22 10:39:40 2025]  ? page_fault_oops+0x16c/0x180
[Wed Jan 22 10:39:40 2025]  ? do_user_addr_fault+0x4c9/0x7e0
[Wed Jan 22 10:39:40 2025]  ? exc_page_fault+0x85/0x1c0
[Wed Jan 22 10:39:40 2025]  ? asm_exc_page_fault+0x27/0x30
[Wed Jan 22 10:39:40 2025]  ? netfs_unlock_read_folio+0x34/0x380 [netfs]
[Wed Jan 22 10:39:40 2025]  netfs_consume_read_data.isra.0+0x3ac/0x900 [netfs]
[Wed Jan 22 10:39:40 2025]  netfs_read_subreq_terminated+0x2ce/0x420 [netfs]
[Wed Jan 22 10:39:40 2025]  smb2_readv_worker+0x1a/0x30 [cifs]
[Wed Jan 22 10:39:40 2025]  process_one_work+0x177/0x350
[Wed Jan 22 10:39:40 2025]  worker_thread+0x33a/0x470
[Wed Jan 22 10:39:40 2025]  ? _raw_spin_unlock_irqrestore+0x11/0x60
[Wed Jan 22 10:39:40 2025]  ? __pfx_worker_thread+0x10/0x10
[Wed Jan 22 10:39:40 2025]  kthread+0xe4/0x110
[Wed Jan 22 10:39:40 2025]  ? __pfx_kthread+0x10/0x10
[Wed Jan 22 10:39:40 2025]  ret_from_fork+0x47/0x70
[Wed Jan 22 10:39:40 2025]  ? __pfx_kthread+0x10/0x10
[Wed Jan 22 10:39:40 2025]  ret_from_fork_asm+0x1a/0x30
[Wed Jan 22 10:39:40 2025]  </TASK>
[Wed Jan 22 10:39:40 2025] Modules linked in: cmac nls_utf8 cifs cifs_arc4 nls_ucs2_utils cifs_md4 netfs qrtr cfg80211 8021q garp mrp stp llc xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_owner xt_tcpudp nft_compat nf_tables binfmt_misc nls_iso8859_1 intel_rapl_msr intel_rapl_common intel_uncore_frequency_common isst_if_common skx_edac_common nfit rapl vmgenid hyperv_drm hv_balloon joydev serio_raw mac_hid sch_fq_codel dm_multipath nvme_fabrics nvme_keyring msr nvme_core nvme_auth efi_pstore nfnetlink dmi_sysfs ip_tables x_tables autofs4 btrfs blake2b_generic raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 mlx5_ib ib_uverbs macsec ib_core mlx5_core mlxfw psample tls pci_hyperv pci_hyperv_intf hid_generic hv_storvsc hid_hyperv hid hv_netvsc scsi_transport_fc hyperv_fb hv_utils hyperv_keyboard crct10dif_pclmul crc32_pclmul polyval_clmulni polyval_generic ghash_clmulni_intel sha256_ssse3 sha1_ssse3 hv_vmbus aesni_intel crypto_simd cryptd
[Wed Jan 22 10:39:40 2025] CR2: 0000000000000000
[Wed Jan 22 10:39:40 2025] ---[ end trace 0000000000000000 ]---
[Wed Jan 22 10:39:40 2025] RIP: 0010:netfs_unlock_read_folio+0x34/0x380 [netfs]
[Wed Jan 22 10:39:40 2025] Code: 89 e5 41 57 49 89 ff 41 56 49 89 f6 41 55 41 54 4d 89 c4 53 48 89 d3 48 83 ec 10 41 83 f8 1e 0f 87 17 03 00 00 4e 8b 6c c3 08 <f0> 41 80 4d 00 08 49 8b 86 58 02 00 00 a9 00 00 00 80 0f 85 d8 00
[Wed Jan 22 10:39:40 2025] RSP: 0018:ffffc17000d9bd48 EFLAGS: 00010297
[Wed Jan 22 10:39:40 2025] RAX: 0000000000400000 RBX: ffff9d030a8dec00 RCX: 0000000000000005
[Wed Jan 22 10:39:40 2025] RDX: ffff9d030a8dec00 RSI: ffff9d0364c87380 RDI: ffff9d03e60f9a40
[Wed Jan 22 10:39:40 2025] RBP: ffffc17000d9bd80 R08: 0000000000000005 R09: 0000000000000000
[Wed Jan 22 10:39:40 2025] R10: 0000000000000005 R11: 0000000002800000 R12: 0000000000000005
[Wed Jan 22 10:39:40 2025] R13: 0000000000000000 R14: ffff9d0364c87380 R15: ffff9d03e60f9a40
[Wed Jan 22 10:39:40 2025] FS:  0000000000000000(0000) GS:ffff9d2553d00000(0000) knlGS:0000000000000000
[Wed Jan 22 10:39:40 2025] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Wed Jan 22 10:39:40 2025] CR2: 0000000000000000 CR3: 00000001062c8003 CR4: 00000000003706f0
[Wed Jan 22 10:39:40 2025] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[Wed Jan 22 10:39:40 2025] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[Wed Jan 22 10:39:40 2025] note: kworker/18:2[489] exited with irqs disabled
maintainer
#14 lore raw

Hi Shyam,

Do you have any particular way of reproducing this? It's been a while since I looked at this bug.

David

maintainer
#15 lore raw
In reply to Shyam Prasad N
Quoted 2 lines · Shyam Prasad N

I tried this again with 6.13-rc1 and the null-ptr deref seems to be slightly different (same function).

Note that v6.13-rc1 doesn't include my patch. You need to be on v6.13-rc7 for that. There are a number of other patches that went in too that might affect what you're seeing.

David

#16 lore raw
Quoted 12 lines · David Howells
Quoted 2 lines · Shyam Prasad N

I tried this again with 6.13-rc1 and the null-ptr deref seems to be slightly different (same function).

Note that v6.13-rc1 doesn't include my patch. You need to be on v6.13-rc7 for that. There are a number of other patches that went in too that might affect what you're seeing.

David

Hi David,

Tried this on v6.13. Same effect.
To reproduce (fairly consistently), I need to mount with an extra mount option of rasize=8388608.

Quoted 2 lines
Quoted 2 lines

We're requesting reads of four folios, each consisting of 512 pages for a total of 8MiB.

Based on your earlier analysis in this email thread, and based on my reading of the code it sounds like there should be a max of 4 folios in the folioq.

Quoted 1 line
Quoted 1 line

netfs: R=00005a08[a] s=2600000-29fffff ctl=200000/400000/400000 sl=5

But based on the OOPS that I attached in my last email, slot number is 5, which explains why folio at that slot is NULL.

I don't understand the donation logic well enough to understand why slot could have overflowed like this. Maybe you can?

Signature · 2 lines
Regards,
Shyam
maintainer
#17 lore raw
Quoted 6 lines · Shyam Prasad N
Quoted 1 line
Quoted 1 line

netfs: R=00005a08[a] s=2600000-29fffff ctl=200000/400000/400000 sl=5

But based on the OOPS that I attached in my last email, slot number is 5, which explains why folio at that slot is NULL.

I don't understand the donation logic well enough to understand why slot could have overflowed like this. Maybe you can?

Can you get a trace with the following tracepoints turned on:

netfs_read
netfs_rreq
netfs_sreq
netfs_donate

Thanks,
David

maintainer
#18 lore raw

PATCH 1/1 netfs: Fix non-contiguous donation between completed reads

In reply to Shyam Prasad N

When a read subrequest finishes, if it doesn't have sufficient coverage to complete the folio(s) covering either side of it, it will donate the excess coverage to the adjacent subrequests on either side, offloading responsibility for unlocking the folio(s) covered to them.

Now, preference is given to donating down to a lower file offset over donating up because that check is done first - but there's no check that the lower subreq is actually contiguous, and so we can end up donating incorrectly.

The scenario seen[1] is that an 8MiB readahead request spanning four 2MiB folios is split into eight 1MiB subreqs (numbered 1 through 8). These terminate in the order 1,6,2,5,3,7,4,8. What happens is:

- 1 donates to 2
- 6 donates to 5
- 2 completes, unlocking the first folio (with 1).
- 5 completes, unlocking the third folio (with 6).
- 3 donates to 4
- 7 donates to 4 incorrectly
- 4 completes, unlocking the second folio (with 3), but can't use the excess from 7.
- 8 donates to 4, also incorrectly.

Fix this by preventing downward donation if the subreqs are not contiguous (in the example above, 7 donates to 4 across the gap left by 5 and 6).

---
 fs/netfs/read_collect.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)
fs/netfs/read_collect.c +5 -4
index 3cbb289535a8..b415e3972336 100644
@@ -247,16 +247,17 @@ static bool netfs_consume_read_data(struct netfs_io_subrequest *subreq, bool was
 
 	/* Deal with the trickiest case: that this subreq is in the middle of a
 	 * folio, not touching either edge, but finishes first.  In such a
-	 * case, we donate to the previous subreq, if there is one, so that the
-	 * donation is only handled when that completes - and remove this
-	 * subreq from the list.
+	 * case, we donate to the previous subreq, if there is one and if it is
+	 * contiguous, so that the donation is only handled when that completes
+	 * - and remove this subreq from the list.
 	 *
 	 * If the previous subreq finished first, we will have acquired their
 	 * donation and should be able to unlock folios and/or donate nextwards.
 	 */
 	if (!subreq->consumed &&
 	    !prev_donated &&
-	    !list_is_first(&subreq->rreq_link, &rreq->subrequests)) {
+	    !list_is_first(&subreq->rreq_link, &rreq->subrequests) &&
+	    subreq->start == prev->start + prev->len) {
 		prev = list_prev_entry(subreq, rreq_link);
 		WRITE_ONCE(prev->next_donated, prev->next_donated + subreq->len);
 		subreq->start += subreq->len;