NFS dereferenced NULL pointer with 3.2.6 kernel.

Hi,

My 3.2.6 (x86, 32 bit) kernel oopsed last night while pulling a file across an NFS mount:

BUG: unable to handle kernel NULL pointer dereference at   (null)
IP: [<c107a333>] page_address+0x7/0xa4
*pde = 00000000
Oops: 0000 [#1] PREEMPT SMP
Modules linked in: nfs fuse cpufreq_ondemand p4_clockmod speedstep_lib bnep bluetooth rfkill crc16 ip6t_LOG ipt_LOG nf_conntrack_ipv6 xt_tcpudp nf_defrag_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack max6650 ip6table_filter iptable_filter ip6_tables ip_tables x_tables dm_mirror dm_region_hash dm_log dm_mod snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_midi_event snd_seq_midi_emul snd_emu10k1 snd_ac97_codec snd_usb_audio ac97_bus snd_seq snd_pcm snd_timer snd_page_alloc snd_util_mem uvcvideo snd_hwdep snd_usbmidi_lib snd_rawmidi snd_seq_device joydev snd usbhid psmouse ppdev videodev parport_pc floppy parport sg firewire_ohci firewire_core pcspkr dcdbas crc_itu_t soundcore serio_raw processor i2c_i801 binfmt_misc nfsd lockd nfs_acl auth_rpcgss sunrpc exportfs uinput ipv6 ext3 jbd mbcache sr_mod sd_mod cdrom sata_sil pata_acpi uhci_hcd ata_piix libata ehci_hcd e1000 scsi_mod usbcore usb_common button radeon intel_agp intel_gtt ttm drm_kms_helper drm agpgart backlight i2c_algo_bit cfbcopyarea cfbimgblt cfbfillrect [last unloaded: scsi_wait_scan]

Pid: 3403, comm: mv Not tainted 3.2.6 #1 Dell Computer Corporation Precision WorkStation 650 /0F1262
EIP: 0060:[<c107a333>] EFLAGS: 00210206 CPU: 1
EIP is at page_address+0x7/0xa4
EAX: 00000000 EBX: f247fde8 ECX: f43df1e4 EDX: 00000038
ESI: f247fccc EDI: 0000000e EBP: 00000000 ESP: f247fc74
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process mv (pid: 3403, ti=f247e000 task=f55c3b00 task.ti=f247e000)

Stack:
 f43df1e4 f247fde8 f247fccc 0000000e f2b79c00 f91d006f 00000000 00001000
 f247fc98 00000000 00000002 f43df074 00000000 00000000 0000006e 00000000
 f54d8400 f2b79c00 00000000 f91d0008 f84d25ff f43df020 f43df0ac f2b79c04
Call Trace:
 [<f91d006f>] ? nfs4_xdr_enc_getacl+0x67/0x86 [nfs]
 [<f91d0008>] ? nfs4_xdr_enc_fs_locations+0x87/0x87 [nfs]
 [<f84d25ff>] ? rpcauth_wrap_req+0x72/0x7c [sunrpc]
 [<f84cc3ef>] ? call_transmit+0x172/0x1dd [sunrpc]
 [<f84d182e>] ? __rpc_execute+0x59/0x216 [sunrpc]
 [<c1021a61>] ? add_preempt_count+0x88/0x8a
 [<c1039936>] ? wake_up_bit+0xb/0x16
 [<f84cc71b>] ? rpc_run_task+0x57/0x5c [sunrpc]
 [<f84cc7fb>] ? rpc_call_sync+0x3a/0x54 [sunrpc]
 [<f91c9164>] ? __nfs4_get_acl_uncached+0x15d/0x1ed [nfs]
 [<f91cb43a>] ? nfs4_xattr_get_nfs4_acl+0xdf/0x10c [nfs]
 [<c10abaee>] ? generic_getxattr+0x3b/0x43
 [<c10abab3>] ? xattr_resolve_name+0x4b/0x4b
 [<c10abeb1>] ? vfs_getxattr+0x74/0x7b
 [<c10abf2c>] ? getxattr+0x74/0xc5
 [<c109fd8c>] ? path_openat+0x2bb/0x2d0
 [<c107d0b7>] ? handle_pte_fault+0x23b/0x5fc
 [<c109fe4a>] ? do_filp_open+0x23/0x5c
 [<c109d1dc>] ? getname_flags+0x20/0xf1
 [<c1021948>] ? get_parent_ip+0x8/0x19
 [<c1021948>] ? get_parent_ip+0x8/0x19
 [<c10219cd>] ? sub_preempt_count+0x74/0x80
 [<c1021948>] ? get_parent_ip+0x8/0x19
 [<c1021a61>] ? add_preempt_count+0x88/0x8a
 [<c1094ede>] ? do_sys_open+0x161/0x16b
 [<c1094ede>] ? do_sys_open+0x161/0x16b
 [<c10ac041>] ? listxattr+0x80/0x88
 [<c10ac5a8>] ? sys_fgetxattr+0x42/0x5a
 [<c1219b8c>] ? sysenter_do_call+0x12/0x22
Code: eb 05 bb ea ff ff ff 89 d8 83 c4 20 5b 5e 5f 5d c3 8b 6c 24 18 f7 44 24 44 00 00 01 00 74 86 31 db eb c5 90 55 57 56 53 51 89 c5 <8b> 00 c1 e8 1e c1 e0 0a 05 80 33 2f c1 2b 80 8c 03 00 00 3d 00
EIP: [<c107a333>] page_address+0x7/0xa4 SS:ESP 0068:f247fc74

CR2: 0000000000000000

The remote host was also running 3.2.6, but was x86_64. (I've not had any trouble copying NFS files between two 32 bit 3.2.6 kernels, which is why I'm thinking that the remote host being x86_64 might be significant.)

For the record, the file was actually copied successfully. After I'd rebooted, I confirmed that the SHA1 sums matched. The "mv" operation obviously failed before the remote copy could be deleted.

Cheers,
Chris

Chris Rankin wrote:

My 3.2.6 (x86, 32 bit) kernel oopsed last night while pulling a file across an NFS mount:

I think this is fixed by commit 331818f1c4, "Fix an Oops in the NFSv4 getacl code." Shouldn't this be in stable by now? It doesn't seem to be.

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Myklebust, Trond wrote:

It's a known bug. There is a fix at

http://git.linux-nfs.org/?p=trondmy/nfs-2.6.git;a=commit;h=331818f1c468a24e581aedcbe52af799366a9dfe

Shouldn't this be in stable by now? You sent it Feb 3, and there have been two stable releases since then.

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It's still not in 3.3-rc either, at least put it there so others can test it?

I've been testing with the patch applied to 3.3 and it fixes the crashes for me....

Thanks,
Ben

Ben Greear <[email protected]>
Candela Technologies Inc  http://www.candelatech.com

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Ok, but seems like it would be pretty lame to release 3.3 with this known crash bug.

And, though I haven't done any thorough NFS testing, I could hit the bug every time before I applied the patch..and since I applied it, I have not had any problems.

So, it has been tested at least a bit.

Thanks,
Ben

Ben Greear <[email protected]>
Candela Technologies Inc  http://www.candelatech.com

I'll test ACLs with the patch this week at Connectathon.

-->Andy

Myklebust, Trond wrote:

I've been waiting for Andy to get back from vacation. We've already sent one buggy patch to stable...

That explains why I have two versions of this patch.

The obvious solution is that Andy should not be allowed to take any vacations. Should we chain him to his desk?