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btrfs bug in 2.6.37

DISCUSSION Carlos R. Mafra 2 participants 3 messages Feb 1, 2011 – Feb 2, 2011 Btrfs file system

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Carlos R. Mafra

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#0 lore raw

I am running 2.6.37 plus the revert of bf9dc102e284 (which is related to drm).

My /home is on btrfs as well as a 1TB external USB hard-disk.

I was compiling 2.6.38-rc3 from /home/mafra/linux2.6 using the external hd as the destination of the compiled files:

make -j4 O=/mnt/wd/kernel-compile

So after some time I got this bug and I was dropped out of X

[ 2730.943101] BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
[ 2730.943159] IP: [<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x820
[ 2730.943217] PGD 2248f067 PUD 5adc8067 PMD 0 
[ 2730.943256] Oops: 0000 [#1] SMP 
[ 2730.943285] last sysfs file: /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
[ 2730.943331] CPU 0 
[ 2730.943346] Modules linked in: ppp_deflate ppp_async ppp_generic slhc snd_seq snd_seq_device vfat fat option usb_wwan usbserial snd_hda_codec_idt snd_hda_intel iwlagn snd_hda_codec sky2 uvcvideo i2c_i801 snd_hwdep evdev
[ 2730.943526] 
[ 2730.943541] Pid: 15437, comm: as Not tainted 2.6.37-xrandr-00001-g1d95a75 #16 VAIO/VGN-FZ240E
[ 2730.943581] RIP: 0010:[<ffffffff811ba3e5>]  [<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x820
[ 2730.943629] RSP: 0000:ffff88005a771ad8  EFLAGS: 00010287
[ 2730.943661] RAX: 00000000fffffffb RBX: ffff88005b048d90 RCX: ffff880037f49d38
[ 2730.943695] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88004d456000
[ 2730.943729] RBP: ffff88005a771b58 R08: 00000000fffffffb R09: 0000000000000000
[ 2730.943763] R10: 0000000000000001 R11: 00000000ffffffff R12: 0000000000000005
[ 2730.943797] R13: ffff88005a771fd8 R14: 0000000000000000 R15: 0000000000000000
[ 2730.943831] FS:  00002b01b9f88000(0000) GS:ffff88007f400000(0000) knlGS:0000000000000000
[ 2730.943872] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 2730.943901] CR2: 0000000000000030 CR3: 000000006161c000 CR4: 00000000000006f0
[ 2730.943934] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2730.943968] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 2730.944002] Process as (pid: 15437, threadinfo ffff88005a770000, task ffff88002ffea680)
[ 2730.944009] Stack:
[ 2730.944009]  0000001cc7d27000 ffffffff811e4724 ffff88004d456000 0000001cc7784000
[ 2730.944009]  ffff88005a771b58 ffff88005b048d90 0000001cc7d27000 00000000005000a8
[ 2730.944009]  ffff8800491a0e00 ffff88006c2de6c0 0000000000000005 ffff88005b048d90
[ 2730.944009] Call Trace:
[ 2730.944009]  [<ffffffff811e4724>] ? set_extent_dirty+0x24/0x30
[ 2730.944009]  [<ffffffff811b30dd>] __btrfs_free_extent+0x61d/0x6e0
[ 2730.944009]  [<ffffffff811b635b>] run_clustered_refs+0x1fb/0x810
[ 2730.944009]  [<ffffffff811e7bda>] ? set_extent_buffer_dirty+0x4a/0xa0
[ 2730.944009]  [<ffffffff811c342f>] ? btrfs_mark_buffer_dirty+0xaf/0x130
[ 2730.944009]  [<ffffffff81201100>] ? btrfs_find_ref_cluster+0x60/0x190
[ 2730.944009]  [<ffffffff811b6a30>] btrfs_run_delayed_refs+0xc0/0x210
[ 2730.944009]  [<ffffffff811c55b8>] __btrfs_end_transaction+0x68/0x240
[ 2730.944009]  [<ffffffff811c57d0>] btrfs_end_transaction+0x10/0x20
[ 2730.944009]  [<ffffffff811ced57>] btrfs_evict_inode+0x1c7/0x1e0
[ 2730.944009]  [<ffffffff810fa8c2>] evict+0x22/0xb0
[ 2730.944009]  [<ffffffff810fb141>] iput+0x1b1/0x290
[ 2730.944009]  [<ffffffff810f14f5>] do_unlinkat+0x115/0x1c0
[ 2730.944009]  [<ffffffff810e94ae>] ? sys_newlstat+0x2e/0x40
[ 2730.944009]  [<ffffffff810f2af1>] sys_unlink+0x11/0x20
[ 2730.944009]  [<ffffffff81002cfb>] system_call_fastpath+0x16/0x1b
[ 2730.944009] Code: 84 00 00 00 00 00 55 48 89 e5 48 83 c4 80 48 89 5d d8 4c 89 6d e8 4c 89 65 e0 4c 89 75 f0 4c 89 7d f8 65 4c 8b 2c 25 88 b5 00 00 <48> 8b 46 30 49 81 ed d8 1f 00 00 48 89 f3 41 ff 45 1c 48 ba 00 
[ 2730.944009] RIP  [<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x820
[ 2730.944009]  RSP <ffff88005a771ad8>
[ 2730.944009] CR2: 0000000000000030
[ 2730.950886] ---[ end trace 3c2d14569018819f ]---
[ 2731.229129] BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
[ 2731.230010] IP: [<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x820
[ 2731.230010] PGD 22623067 PUD 2278d067 PMD 0 
[ 2731.230010] Oops: 0000 [#2] SMP 
[ 2731.230010] last sysfs file: /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
[ 2731.230010] CPU 1 
[ 2731.230010] Modules linked in: ppp_deflate ppp_async ppp_generic slhc snd_seq snd_seq_device vfat fat option usb_wwan usbserial snd_hda_codec_idt snd_hda_intel iwlagn snd_hda_codec sky2 uvcvideo i2c_i801 snd_hwdep evdev
[ 2731.230010] 
[ 2731.230010] Pid: 15444, comm: as Tainted: G      D     2.6.37-xrandr-00001-g1d95a75 #16 VAIO/VGN-FZ240E
[ 2731.230010] RIP: 0010:[<ffffffff811ba3e5>]  [<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x820
[ 2731.230010] RSP: 0000:ffff88004d42dad8  EFLAGS: 00010287
[ 2731.230010] RAX: 00000000fffffffb RBX: ffff88005b048b50 RCX: ffff880037f49d38
[ 2731.230010] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88004d456000
[ 2731.230010] RBP: ffff88004d42db58 R08: 00000000fffffffb R09: 0000000000000000
[ 2731.230010] R10: 0000000000000001 R11: 00000000ffffffff R12: 0000000000000005
[ 2731.230010] R13: ffff88004d42dfd8 R14: 0000000000000000 R15: 0000000000000000
[ 2731.230010] FS:  00002aac5cec6000(0000) GS:ffff88007f500000(0000) knlGS:0000000000000000
[ 2731.230010] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 2731.230010] CR2: 0000000000000030 CR3: 00000000226af000 CR4: 00000000000006e0
[ 2731.230010] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2731.230010] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 2731.230010] Process as (pid: 15444, threadinfo ffff88004d42c000, task ffff88007b69e280)
[ 2731.230010] Stack:
[ 2731.230010]  0000001cc7d2c000 ffffffff811dd7c5 ffff88004d456000 ffff8800218b8898
[ 2731.230010]  ffff88004d42dba8 ffff88005b048b50 0000001cc7d2c000 00000000005000a8
[ 2731.230010]  ffff88004d42db00 ffff88005a5e5cc0 0000000000000005 ffff88005b048b50
[ 2731.230010] Call Trace:
[ 2731.230010]  [<ffffffff811dd7c5>] ? btrfs_key_generation+0xe5/0xf0
[ 2731.230010]  [<ffffffff811b30dd>] __btrfs_free_extent+0x61d/0x6e0
[ 2731.230010]  [<ffffffff811e7bda>] ? set_extent_buffer_dirty+0x4a/0xa0
[ 2731.230010]  [<ffffffff811c342f>] ? btrfs_mark_buffer_dirty+0xaf/0x130
[ 2731.230010]  [<ffffffff811b635b>] run_clustered_refs+0x1fb/0x810
[ 2731.230010]  [<ffffffff81201100>] ? btrfs_find_ref_cluster+0x60/0x190
[ 2731.230010]  [<ffffffff811b6a30>] btrfs_run_delayed_refs+0xc0/0x210
[ 2731.230010]  [<ffffffff811c55b8>] __btrfs_end_transaction+0x68/0x240
[ 2731.230010]  [<ffffffff811c57d0>] btrfs_end_transaction+0x10/0x20
[ 2731.230010]  [<ffffffff811ced1f>] btrfs_evict_inode+0x18f/0x1e0
[ 2731.230010]  [<ffffffff810fa8c2>] evict+0x22/0xb0
[ 2731.230010]  [<ffffffff810fb141>] iput+0x1b1/0x290
[ 2731.230010]  [<ffffffff810f14f5>] do_unlinkat+0x115/0x1c0
[ 2731.230010]  [<ffffffff810e94ae>] ? sys_newlstat+0x2e/0x40
[ 2731.230010]  [<ffffffff810f2af1>] sys_unlink+0x11/0x20
[ 2731.230010]  [<ffffffff81002cfb>] system_call_fastpath+0x16/0x1b
[ 2731.230010] Code: 84 00 00 00 00 00 55 48 89 e5 48 83 c4 80 48 89 5d d8 4c 89 6d e8 4c 89 65 e0 4c 89 75 f0 4c 89 7d f8 65 4c 8b 2c 25 88 b5 00 00 <48> 8b 46 30 49 81 ed d8 1f 00 00 48 89 f3 41 ff 45 1c 48 ba 00 
[ 2731.230010] RIP  [<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x820
[ 2731.230010]  RSP <ffff88004d42dad8>
[ 2731.230010] CR2: 0000000000000030
[ 2731.304076] ---[ end trace 3c2d1456901881a0 ]---
[ 2731.778512] BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
[ 2731.779007] IP: [<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x820
[ 2731.779007] PGD 2ffa8067 PUD 5a93d067 PMD 0 
[ 2731.779007] Oops: 0000 [#3] SMP 
[ 2731.779007] last sysfs file: /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
[ 2731.779007] CPU 0 
[ 2731.779007] Modules linked in: ppp_deflate ppp_async ppp_generic slhc snd_seq snd_seq_device vfat fat option usb_wwan usbserial snd_hda_codec_idt snd_hda_intel iwlagn snd_hda_codec sky2 uvcvideo i2c_i801 snd_hwdep evdev
[ 2731.779007] 
[ 2731.779007] Pid: 15448, comm: as Tainted: G      D     2.6.37-xrandr-00001-g1d95a75 #16 VAIO/VGN-FZ240E
[ 2731.779007] RIP: 0010:[<ffffffff811ba3e5>]  [<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x820
[ 2731.779007] RSP: 0018:ffff8800227c5ad8  EFLAGS: 00010287
[ 2731.779007] RAX: 00000000fffffffb RBX: ffff88005b048c70 RCX: ffff880021f9fd38
[ 2731.779007] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88004d456000
[ 2731.779007] RBP: ffff8800227c5b58 R08: 00000000fffffffb R09: 0000000000000000
[ 2731.779007] R10: 0000000000000001 R11: 00000000ffffffff R12: 0000000000000005
[ 2731.779007] R13: ffff8800227c5fd8 R14: 0000000000000000 R15: 0000000000000000
[ 2731.779007] FS:  00002b0f18c8e000(0000) GS:ffff88007f400000(0000) knlGS:0000000000000000
[ 2731.779007] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 2731.779007] CR2: 0000000000000030 CR3: 000000006c0b5000 CR4: 00000000000006f0
[ 2731.779007] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2731.779007] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 2731.779007] Process as (pid: 15448, threadinfo ffff8800227c4000, task ffff88003acfc5c0)
[ 2731.779007] Stack:
[ 2731.779007]  0000001cc7d3c000 ffffffff811dd7c5 ffff88004d456000 ffff8800218b21f0
[ 2731.779007]  ffff8800227c5ba8 ffff88005b048c70 0000001cc7d3c000 00000000005000a8
[ 2731.779007]  ffff8800227c5b00 ffff88007229ea40 0000000000000005 ffff88005b048c70
[ 2731.779007] Call Trace:
[ 2731.779007]  [<ffffffff811dd7c5>] ? btrfs_key_generation+0xe5/0xf0
[ 2731.779007]  [<ffffffff811b30dd>] __btrfs_free_extent+0x61d/0x6e0
[ 2731.779007]  [<ffffffff811dd9b4>] ? btrfs_item_offset+0xe4/0xf0
[ 2731.779007]  [<ffffffff811b635b>] run_clustered_refs+0x1fb/0x810
[ 2731.779007]  [<ffffffff811e7bda>] ? set_extent_buffer_dirty+0x4a/0xa0
[ 2731.779007]  [<ffffffff811c342f>] ? btrfs_mark_buffer_dirty+0xaf/0x130
[ 2731.779007]  [<ffffffff81201100>] ? btrfs_find_ref_cluster+0x60/0x190
[ 2731.779007]  [<ffffffff811b6a30>] btrfs_run_delayed_refs+0xc0/0x210
[ 2731.779007]  [<ffffffff811c55b8>] __btrfs_end_transaction+0x68/0x240
[ 2731.779007]  [<ffffffff811c57d0>] btrfs_end_transaction+0x10/0x20
[ 2731.779007]  [<ffffffff811ced57>] btrfs_evict_inode+0x1c7/0x1e0
[ 2731.779007]  [<ffffffff810fa8c2>] evict+0x22/0xb0
[ 2731.779007]  [<ffffffff810fb141>] iput+0x1b1/0x290
[ 2731.779007]  [<ffffffff810f14f5>] do_unlinkat+0x115/0x1c0
[ 2731.779007]  [<ffffffff810e94ae>] ? sys_newlstat+0x2e/0x40
[ 2731.779007]  [<ffffffff810f2af1>] sys_unlink+0x11/0x20
[ 2731.779007]  [<ffffffff81002cfb>] system_call_fastpath+0x16/0x1b
[ 2731.779007] Code: 84 00 00 00 00 00 55 48 89 e5 48 83 c4 80 48 89 5d d8 4c 89 6d e8 4c 89 65 e0 4c 89 75 f0 4c 89 7d f8 65 4c 8b 2c 25 88 b5 00 00 <48> 8b 46 30 49 81 ed d8 1f 00 00 48 89 f3 41 ff 45 1c 48 ba 00 
[ 2731.779007] RIP  [<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x820
[ 2731.779007]  RSP <ffff8800227c5ad8>
[ 2731.779007] CR2: 0000000000000030
[ 2731.855520] ---[ end trace 3c2d1456901881a1 ]---
[ 2732.101887] btrfs csum failed ino 244904 extent 124692799488 csum 4201110721 wanted 126609361 mirror 0
[ 2732.102064] btrfs csum failed ino 244904 extent 124692799488 csum 2566472073 wanted 126609361 mirror 1
[ 2732.102084] btrfs csum failed ino 244904 extent 124692799488 csum 2566472073 wanted 126609361 mirror 1
[ 2732.102102] btrfs csum failed ino 244904 extent 124692799488 csum 2566472073 wanted 126609361 mirror 1
[ 2732.102121] btrfs csum failed ino 244904 extent 124692799488 csum 2566472073 wanted 126609361 mirror 1
[ 2732.102139] btrfs csum failed ino 244904 extent 124692799488 csum 2566472073 wanted 126609361 mirror 1
[ 2732.102158] btrfs csum failed ino 244904 extent 124692799488 csum 2566472073 wanted 126609361 mirror 1
[ 2732.102176] btrfs csum failed ino 244904 extent 124692799488 csum 2566472073 wanted 126609361 mirror 1
[ 2732.102195] btrfs csum failed ino 244904 extent 124692799488 csum 2566472073 wanted 126609361 mirror 1
[ 2732.102213] btrfs csum failed ino 244904 extent 124692799488 csum 2566472073 wanted 126609361 mirror 1
[ 2732.102231] btrfs csum failed ino 244904 extent 124692799488 csum 2566472073 wanted 126609361 mirror 1
[ 2732.102250] btrfs csum failed ino 244904 extent 124692799488 csum 2566472073 wanted 126609361 mirror 1
[ 2732.103048] btrfs csum failed ino 244904 extent 124692799488 csum 2566472073 wanted 126609361 mirror 0
[ 2732.103086] btrfs csum failed ino 244904 extent 124692799488 csum 2566472073 wanted 126609361 mirror 1
[ 2738.344564] btrfs csum failed ino 244835 extent 124686446592 csum 4201110721 wanted 3023272677 mirror 0
[ 2738.344662] btrfs csum failed ino 244835 extent 124686446592 csum 2566472073 wanted 3023272677 mirror 1
[ 2738.344683] btrfs csum failed ino 244835 extent 124686446592 csum 4201110721 wanted 3023272677 mirror 1
[ 2738.344702] btrfs csum failed ino 244835 extent 124686446592 csum 2566472073 wanted 3023272677 mirror 1
[ 2738.344729] btrfs csum failed ino 244835 extent 124686446592 csum 2566472073 wanted 3023272677 mirror 1
[ 2738.344748] btrfs csum failed ino 244835 extent 124686446592 csum 2566472073 wanted 3023272677 mirror 1
[ 2738.344752] btrfs csum failed ino 244835 extent 124686446592 csum 2566472073 wanted 3023272677 mirror 1
[ 2738.344768] btrfs csum failed ino 244835 extent 124686446592 csum 2566472073 wanted 3023272677 mirror 1
[ 2738.344772] btrfs csum failed ino 244835 extent 124686446592 csum 2566472073 wanted 3023272677 mirror 1
[ 2738.344792] btrfs csum failed ino 244835 extent 124686446592 csum 2566472073 wanted 3023272677 mirror 1
[ 2738.344823] btrfs csum failed ino 244835 extent 124686446592 csum 2566472073 wanted 3023272677 mirror 1
[ 2738.344843] btrfs csum failed ino 244835 extent 124686446592 csum 2566472073 wanted 3023272677 mirror 1
[ 2738.344862] btrfs csum failed ino 244835 extent 124686446592 csum 2566472073 wanted 3023272677 mirror 1
[ 2738.344884] btrfs csum failed ino 244835 extent 124686446592 csum 2566472073 wanted 3023272677 mirror 0
[ 2738.344932] btrfs csum failed ino 244835 extent 124686446592 csum 2566472073 wanted 3023272677 mirror 1

Is this problem already known?

#1 lore raw

On Tue, Feb 1, 2011 at 3:51 PM, Carlos R. Mafra <[email protected]> wr= ote:

Quoted 2 lines

I am running 2.6.37 plus the revert of bf9dc102e284 (which is related=

to drm).

Quoted 11 lines

My /home is on btrfs as well as a 1TB external USB hard-disk.

I was compiling 2.6.38-rc3 from /home/mafra/linux2.6 using the external hd as the destination of the compiled files:

make -j4 O=3D/mnt/wd/kernel-compile

So after some time I got this bug and I was dropped out of X

[ 2730.943101] BUG: unable to handle kernel NULL pointer dereference =

at 0000000000000030

Quoted 4 lines
[ 2730.943159] IP: [<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x820
[ 2730.943217] PGD 2248f067 PUD 5adc8067 PMD 0
[ 2730.943256] Oops: 0000 [#1] SMP
[ 2730.943285] last sysfs file: /sys/devices/system/cpu/cpu0/cpufreq/=

scaling_cur_freq

Quoted 2 lines
[ 2730.943331] CPU 0
[ 2730.943346] Modules linked in: ppp_deflate ppp_async ppp_generic s=

lhc snd_seq snd_seq_device vfat fat option usb_wwan usbserial snd_hda_c= odec_idt snd_hda_intel iwlagn snd_hda_codec sky2 uvcvideo i2c_i801 snd_= hwdep evdev

Quoted 2 lines
[ 2730.943526]
[ 2730.943541] Pid: 15437, comm: as Not tainted 2.6.37-xrandr-00001-g=

1d95a75 #16 VAIO/VGN-FZ240E

Quoted 1 line
[ 2730.943581] RIP: 0010:[<ffffffff811ba3e5>] =A0[<ffffffff811ba3e5>]=

btrfs_print_leaf+0x25/0x820

Quoted 2 lines
[ 2730.943629] RSP: 0000:ffff88005a771ad8 =A0EFLAGS: 00010287
[ 2730.943661] RAX: 00000000fffffffb RBX: ffff88005b048d90 RCX: ffff8=

80037f49d38

Quoted 1 line
[ 2730.943695] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8=

8004d456000

Quoted 1 line
[ 2730.943729] RBP: ffff88005a771b58 R08: 00000000fffffffb R09: 00000=

00000000000

Quoted 1 line
[ 2730.943763] R10: 0000000000000001 R11: 00000000ffffffff R12: 00000=

00000000005

Quoted 1 line
[ 2730.943797] R13: ffff88005a771fd8 R14: 0000000000000000 R15: 00000=

00000000000

Quoted 1 line
[ 2730.943831] FS: =A000002b01b9f88000(0000) GS:ffff88007f400000(0000=

) knlGS:0000000000000000

Quoted 2 lines
[ 2730.943872] CS: =A00010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 2730.943901] CR2: 0000000000000030 CR3: 000000006161c000 CR4: 00000=

000000006f0

Quoted 1 line
[ 2730.943934] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 00000=

00000000000

Quoted 1 line
[ 2730.943968] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 00000=

00000000400

Quoted 1 line
[ 2730.944002] Process as (pid: 15437, threadinfo ffff88005a770000, t=

ask ffff88002ffea680)

Quoted 2 lines
[ 2730.944009] Stack:
[ 2730.944009] =A00000001cc7d27000 ffffffff811e4724 ffff88004d456000 =

0000001cc7784000

Quoted 1 line
[ 2730.944009] =A0ffff88005a771b58 ffff88005b048d90 0000001cc7d27000 =

00000000005000a8

Quoted 1 line
[ 2730.944009] =A0ffff8800491a0e00 ffff88006c2de6c0 0000000000000005 =

ffff88005b048d90

Quoted 3 lines
[ 2730.944009] Call Trace:
[ 2730.944009] =A0[<ffffffff811e4724>] ? set_extent_dirty+0x24/0x30
[ 2730.944009] =A0[<ffffffff811b30dd>] __btrfs_free_extent+0x61d/0x6e=

0

Quoted 2 lines
[ 2730.944009] =A0[<ffffffff811b635b>] run_clustered_refs+0x1fb/0x810
[ 2730.944009] =A0[<ffffffff811e7bda>] ? set_extent_buffer_dirty+0x4a=

/0xa0

Quoted 1 line
[ 2730.944009] =A0[<ffffffff811c342f>] ? btrfs_mark_buffer_dirty+0xaf=

/0x130

Quoted 1 line
[ 2730.944009] =A0[<ffffffff81201100>] ? btrfs_find_ref_cluster+0x60/=

0x190

Quoted 1 line
[ 2730.944009] =A0[<ffffffff811b6a30>] btrfs_run_delayed_refs+0xc0/0x=

210

Quoted 1 line
[ 2730.944009] =A0[<ffffffff811c55b8>] __btrfs_end_transaction+0x68/0=

x240

Quoted 1 line
[ 2730.944009] =A0[<ffffffff811c57d0>] btrfs_end_transaction+0x10/0x2=

0

Quoted 8 lines
[ 2730.944009] =A0[<ffffffff811ced57>] btrfs_evict_inode+0x1c7/0x1e0
[ 2730.944009] =A0[<ffffffff810fa8c2>] evict+0x22/0xb0
[ 2730.944009] =A0[<ffffffff810fb141>] iput+0x1b1/0x290
[ 2730.944009] =A0[<ffffffff810f14f5>] do_unlinkat+0x115/0x1c0
[ 2730.944009] =A0[<ffffffff810e94ae>] ? sys_newlstat+0x2e/0x40
[ 2730.944009] =A0[<ffffffff810f2af1>] sys_unlink+0x11/0x20
[ 2730.944009] =A0[<ffffffff81002cfb>] system_call_fastpath+0x16/0x1b
[ 2730.944009] Code: 84 00 00 00 00 00 55 48 89 e5 48 83 c4 80 48 89 =

5d d8 4c 89 6d e8 4c 89 65 e0 4c 89 75 f0 4c 89 7d f8 65 4c 8b 2c 25 88=
b5 00 00 <48> 8b 46 30 49 81 ed d8 1f 00 00 48 89 f3 41 ff 45 1c 48 ba= 00

Quoted 1 line
[ 2730.944009] RIP =A0[<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x82=

0

Quoted 4 lines
[ 2730.944009] =A0RSP <ffff88005a771ad8>
[ 2730.944009] CR2: 0000000000000030
[ 2730.950886] ---[ end trace 3c2d14569018819f ]---
[ 2731.229129] BUG: unable to handle kernel NULL pointer dereference =

at 0000000000000030

Quoted 4 lines
[ 2731.230010] IP: [<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x820
[ 2731.230010] PGD 22623067 PUD 2278d067 PMD 0
[ 2731.230010] Oops: 0000 [#2] SMP
[ 2731.230010] last sysfs file: /sys/devices/system/cpu/cpu0/cpufreq/=

scaling_cur_freq

Quoted 2 lines
[ 2731.230010] CPU 1
[ 2731.230010] Modules linked in: ppp_deflate ppp_async ppp_generic s=

lhc snd_seq snd_seq_device vfat fat option usb_wwan usbserial snd_hda_c= odec_idt snd_hda_intel iwlagn snd_hda_codec sky2 uvcvideo i2c_i801 snd_= hwdep evdev

Quoted 2 lines
[ 2731.230010]
[ 2731.230010] Pid: 15444, comm: as Tainted: G =A0 =A0 =A0D =A0 =A0 2=

=2E6.37-xrandr-00001-g1d95a75 #16 VAIO/VGN-FZ240E

Quoted 1 line
[ 2731.230010] RIP: 0010:[<ffffffff811ba3e5>] =A0[<ffffffff811ba3e5>]=

btrfs_print_leaf+0x25/0x820

Quoted 2 lines
[ 2731.230010] RSP: 0000:ffff88004d42dad8 =A0EFLAGS: 00010287
[ 2731.230010] RAX: 00000000fffffffb RBX: ffff88005b048b50 RCX: ffff8=

80037f49d38

Quoted 1 line
[ 2731.230010] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8=

8004d456000

Quoted 1 line
[ 2731.230010] RBP: ffff88004d42db58 R08: 00000000fffffffb R09: 00000=

00000000000

Quoted 1 line
[ 2731.230010] R10: 0000000000000001 R11: 00000000ffffffff R12: 00000=

00000000005

Quoted 1 line
[ 2731.230010] R13: ffff88004d42dfd8 R14: 0000000000000000 R15: 00000=

00000000000

Quoted 1 line
[ 2731.230010] FS: =A000002aac5cec6000(0000) GS:ffff88007f500000(0000=

) knlGS:0000000000000000

Quoted 2 lines
[ 2731.230010] CS: =A00010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 2731.230010] CR2: 0000000000000030 CR3: 00000000226af000 CR4: 00000=

000000006e0

Quoted 1 line
[ 2731.230010] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 00000=

00000000000

Quoted 1 line
[ 2731.230010] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 00000=

00000000400

Quoted 1 line
[ 2731.230010] Process as (pid: 15444, threadinfo ffff88004d42c000, t=

ask ffff88007b69e280)

Quoted 2 lines
[ 2731.230010] Stack:
[ 2731.230010] =A00000001cc7d2c000 ffffffff811dd7c5 ffff88004d456000 =

ffff8800218b8898

Quoted 1 line
[ 2731.230010] =A0ffff88004d42dba8 ffff88005b048b50 0000001cc7d2c000 =

00000000005000a8

Quoted 1 line
[ 2731.230010] =A0ffff88004d42db00 ffff88005a5e5cc0 0000000000000005 =

ffff88005b048b50

Quoted 2 lines
[ 2731.230010] Call Trace:
[ 2731.230010] =A0[<ffffffff811dd7c5>] ? btrfs_key_generation+0xe5/0x=

f0

Quoted 1 line
[ 2731.230010] =A0[<ffffffff811b30dd>] __btrfs_free_extent+0x61d/0x6e=

0

Quoted 1 line
[ 2731.230010] =A0[<ffffffff811e7bda>] ? set_extent_buffer_dirty+0x4a=

/0xa0

Quoted 1 line
[ 2731.230010] =A0[<ffffffff811c342f>] ? btrfs_mark_buffer_dirty+0xaf=

/0x130

Quoted 2 lines
[ 2731.230010] =A0[<ffffffff811b635b>] run_clustered_refs+0x1fb/0x810
[ 2731.230010] =A0[<ffffffff81201100>] ? btrfs_find_ref_cluster+0x60/=

0x190

Quoted 1 line
[ 2731.230010] =A0[<ffffffff811b6a30>] btrfs_run_delayed_refs+0xc0/0x=

210

Quoted 1 line
[ 2731.230010] =A0[<ffffffff811c55b8>] __btrfs_end_transaction+0x68/0=

x240

Quoted 1 line
[ 2731.230010] =A0[<ffffffff811c57d0>] btrfs_end_transaction+0x10/0x2=

0

Quoted 8 lines
[ 2731.230010] =A0[<ffffffff811ced1f>] btrfs_evict_inode+0x18f/0x1e0
[ 2731.230010] =A0[<ffffffff810fa8c2>] evict+0x22/0xb0
[ 2731.230010] =A0[<ffffffff810fb141>] iput+0x1b1/0x290
[ 2731.230010] =A0[<ffffffff810f14f5>] do_unlinkat+0x115/0x1c0
[ 2731.230010] =A0[<ffffffff810e94ae>] ? sys_newlstat+0x2e/0x40
[ 2731.230010] =A0[<ffffffff810f2af1>] sys_unlink+0x11/0x20
[ 2731.230010] =A0[<ffffffff81002cfb>] system_call_fastpath+0x16/0x1b
[ 2731.230010] Code: 84 00 00 00 00 00 55 48 89 e5 48 83 c4 80 48 89 =

5d d8 4c 89 6d e8 4c 89 65 e0 4c 89 75 f0 4c 89 7d f8 65 4c 8b 2c 25 88=
b5 00 00 <48> 8b 46 30 49 81 ed d8 1f 00 00 48 89 f3 41 ff 45 1c 48 ba= 00

Quoted 1 line
[ 2731.230010] RIP =A0[<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x82=

0

Quoted 4 lines
[ 2731.230010] =A0RSP <ffff88004d42dad8>
[ 2731.230010] CR2: 0000000000000030
[ 2731.304076] ---[ end trace 3c2d1456901881a0 ]---
[ 2731.778512] BUG: unable to handle kernel NULL pointer dereference =

at 0000000000000030

Quoted 4 lines
[ 2731.779007] IP: [<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x820
[ 2731.779007] PGD 2ffa8067 PUD 5a93d067 PMD 0
[ 2731.779007] Oops: 0000 [#3] SMP
[ 2731.779007] last sysfs file: /sys/devices/system/cpu/cpu0/cpufreq/=

scaling_cur_freq

Quoted 2 lines
[ 2731.779007] CPU 0
[ 2731.779007] Modules linked in: ppp_deflate ppp_async ppp_generic s=

lhc snd_seq snd_seq_device vfat fat option usb_wwan usbserial snd_hda_c= odec_idt snd_hda_intel iwlagn snd_hda_codec sky2 uvcvideo i2c_i801 snd_= hwdep evdev

Quoted 2 lines
[ 2731.779007]
[ 2731.779007] Pid: 15448, comm: as Tainted: G =A0 =A0 =A0D =A0 =A0 2=

=2E6.37-xrandr-00001-g1d95a75 #16 VAIO/VGN-FZ240E

Quoted 1 line
[ 2731.779007] RIP: 0010:[<ffffffff811ba3e5>] =A0[<ffffffff811ba3e5>]=

btrfs_print_leaf+0x25/0x820

Quoted 2 lines
[ 2731.779007] RSP: 0018:ffff8800227c5ad8 =A0EFLAGS: 00010287
[ 2731.779007] RAX: 00000000fffffffb RBX: ffff88005b048c70 RCX: ffff8=

80021f9fd38

Quoted 1 line
[ 2731.779007] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8=

8004d456000

Quoted 1 line
[ 2731.779007] RBP: ffff8800227c5b58 R08: 00000000fffffffb R09: 00000=

00000000000

Quoted 1 line
[ 2731.779007] R10: 0000000000000001 R11: 00000000ffffffff R12: 00000=

00000000005

Quoted 1 line
[ 2731.779007] R13: ffff8800227c5fd8 R14: 0000000000000000 R15: 00000=

00000000000

Quoted 1 line
[ 2731.779007] FS: =A000002b0f18c8e000(0000) GS:ffff88007f400000(0000=

) knlGS:0000000000000000

Quoted 2 lines
[ 2731.779007] CS: =A00010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 2731.779007] CR2: 0000000000000030 CR3: 000000006c0b5000 CR4: 00000=

000000006f0

Quoted 1 line
[ 2731.779007] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 00000=

00000000000

Quoted 1 line
[ 2731.779007] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 00000=

00000000400

Quoted 1 line
[ 2731.779007] Process as (pid: 15448, threadinfo ffff8800227c4000, t=

ask ffff88003acfc5c0)

Quoted 2 lines
[ 2731.779007] Stack:
[ 2731.779007] =A00000001cc7d3c000 ffffffff811dd7c5 ffff88004d456000 =

ffff8800218b21f0

Quoted 1 line
[ 2731.779007] =A0ffff8800227c5ba8 ffff88005b048c70 0000001cc7d3c000 =

00000000005000a8

Quoted 1 line
[ 2731.779007] =A0ffff8800227c5b00 ffff88007229ea40 0000000000000005 =

ffff88005b048c70

Quoted 2 lines
[ 2731.779007] Call Trace:
[ 2731.779007] =A0[<ffffffff811dd7c5>] ? btrfs_key_generation+0xe5/0x=

f0

Quoted 1 line
[ 2731.779007] =A0[<ffffffff811b30dd>] __btrfs_free_extent+0x61d/0x6e=

0

Quoted 3 lines
[ 2731.779007] =A0[<ffffffff811dd9b4>] ? btrfs_item_offset+0xe4/0xf0
[ 2731.779007] =A0[<ffffffff811b635b>] run_clustered_refs+0x1fb/0x810
[ 2731.779007] =A0[<ffffffff811e7bda>] ? set_extent_buffer_dirty+0x4a=

/0xa0

Quoted 1 line
[ 2731.779007] =A0[<ffffffff811c342f>] ? btrfs_mark_buffer_dirty+0xaf=

/0x130

Quoted 1 line
[ 2731.779007] =A0[<ffffffff81201100>] ? btrfs_find_ref_cluster+0x60/=

0x190

Quoted 1 line
[ 2731.779007] =A0[<ffffffff811b6a30>] btrfs_run_delayed_refs+0xc0/0x=

210

Quoted 1 line
[ 2731.779007] =A0[<ffffffff811c55b8>] __btrfs_end_transaction+0x68/0=

x240

Quoted 1 line
[ 2731.779007] =A0[<ffffffff811c57d0>] btrfs_end_transaction+0x10/0x2=

0

Quoted 8 lines
[ 2731.779007] =A0[<ffffffff811ced57>] btrfs_evict_inode+0x1c7/0x1e0
[ 2731.779007] =A0[<ffffffff810fa8c2>] evict+0x22/0xb0
[ 2731.779007] =A0[<ffffffff810fb141>] iput+0x1b1/0x290
[ 2731.779007] =A0[<ffffffff810f14f5>] do_unlinkat+0x115/0x1c0
[ 2731.779007] =A0[<ffffffff810e94ae>] ? sys_newlstat+0x2e/0x40
[ 2731.779007] =A0[<ffffffff810f2af1>] sys_unlink+0x11/0x20
[ 2731.779007] =A0[<ffffffff81002cfb>] system_call_fastpath+0x16/0x1b
[ 2731.779007] Code: 84 00 00 00 00 00 55 48 89 e5 48 83 c4 80 48 89 =

5d d8 4c 89 6d e8 4c 89 65 e0 4c 89 75 f0 4c 89 7d f8 65 4c 8b 2c 25 88=
b5 00 00 <48> 8b 46 30 49 81 ed d8 1f 00 00 48 89 f3 41 ff 45 1c 48 ba= 00

Quoted 1 line
[ 2731.779007] RIP =A0[<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x82=

0

Quoted 4 lines
[ 2731.779007] =A0RSP <ffff8800227c5ad8>
[ 2731.779007] CR2: 0000000000000030
[ 2731.855520] ---[ end trace 3c2d1456901881a1 ]---
[ 2732.101887] btrfs csum failed ino 244904 extent 124692799488 csum =

4201110721 wanted 126609361 mirror 0

Quoted 1 line
[ 2732.102064] btrfs csum failed ino 244904 extent 124692799488 csum =

2566472073 wanted 126609361 mirror 1

Quoted 1 line
[ 2732.102084] btrfs csum failed ino 244904 extent 124692799488 csum =

2566472073 wanted 126609361 mirror 1

Quoted 1 line
[ 2732.102102] btrfs csum failed ino 244904 extent 124692799488 csum =

2566472073 wanted 126609361 mirror 1

Quoted 1 line
[ 2732.102121] btrfs csum failed ino 244904 extent 124692799488 csum =

2566472073 wanted 126609361 mirror 1

Quoted 1 line
[ 2732.102139] btrfs csum failed ino 244904 extent 124692799488 csum =

2566472073 wanted 126609361 mirror 1

Quoted 1 line
[ 2732.102158] btrfs csum failed ino 244904 extent 124692799488 csum =

2566472073 wanted 126609361 mirror 1

Quoted 1 line
[ 2732.102176] btrfs csum failed ino 244904 extent 124692799488 csum =

2566472073 wanted 126609361 mirror 1

Quoted 1 line
[ 2732.102195] btrfs csum failed ino 244904 extent 124692799488 csum =

2566472073 wanted 126609361 mirror 1

Quoted 1 line
[ 2732.102213] btrfs csum failed ino 244904 extent 124692799488 csum =

2566472073 wanted 126609361 mirror 1

Quoted 1 line
[ 2732.102231] btrfs csum failed ino 244904 extent 124692799488 csum =

2566472073 wanted 126609361 mirror 1

Quoted 1 line
[ 2732.102250] btrfs csum failed ino 244904 extent 124692799488 csum =

2566472073 wanted 126609361 mirror 1

Quoted 1 line
[ 2732.103048] btrfs csum failed ino 244904 extent 124692799488 csum =

2566472073 wanted 126609361 mirror 0

Quoted 1 line
[ 2732.103086] btrfs csum failed ino 244904 extent 124692799488 csum =

2566472073 wanted 126609361 mirror 1

Quoted 1 line
[ 2738.344564] btrfs csum failed ino 244835 extent 124686446592 csum =

4201110721 wanted 3023272677 mirror 0

Quoted 1 line
[ 2738.344662] btrfs csum failed ino 244835 extent 124686446592 csum =

2566472073 wanted 3023272677 mirror 1

Quoted 1 line
[ 2738.344683] btrfs csum failed ino 244835 extent 124686446592 csum =

4201110721 wanted 3023272677 mirror 1

Quoted 1 line
[ 2738.344702] btrfs csum failed ino 244835 extent 124686446592 csum =

2566472073 wanted 3023272677 mirror 1

Quoted 1 line
[ 2738.344729] btrfs csum failed ino 244835 extent 124686446592 csum =

2566472073 wanted 3023272677 mirror 1

Quoted 1 line
[ 2738.344748] btrfs csum failed ino 244835 extent 124686446592 csum =

2566472073 wanted 3023272677 mirror 1

Quoted 1 line
[ 2738.344752] btrfs csum failed ino 244835 extent 124686446592 csum =

2566472073 wanted 3023272677 mirror 1

Quoted 1 line
[ 2738.344768] btrfs csum failed ino 244835 extent 124686446592 csum =

2566472073 wanted 3023272677 mirror 1

Quoted 1 line
[ 2738.344772] btrfs csum failed ino 244835 extent 124686446592 csum =

2566472073 wanted 3023272677 mirror 1

Quoted 1 line
[ 2738.344792] btrfs csum failed ino 244835 extent 124686446592 csum =

2566472073 wanted 3023272677 mirror 1

Quoted 1 line
[ 2738.344823] btrfs csum failed ino 244835 extent 124686446592 csum =

2566472073 wanted 3023272677 mirror 1

Quoted 1 line
[ 2738.344843] btrfs csum failed ino 244835 extent 124686446592 csum =

2566472073 wanted 3023272677 mirror 1

Quoted 1 line
[ 2738.344862] btrfs csum failed ino 244835 extent 124686446592 csum =

2566472073 wanted 3023272677 mirror 1

Quoted 1 line
[ 2738.344884] btrfs csum failed ino 244835 extent 124686446592 csum =

2566472073 wanted 3023272677 mirror 0

Quoted 1 line
[ 2738.344932] btrfs csum failed ino 244835 extent 124686446592 csum =

2566472073 wanted 3023272677 mirror 1

Quoted 3 lines

Is this problem already known?

Was there anything else before the first bug in dmesg? I would predict there to have been some additional debugging info, and probably a USB device disconnect or similar.

If I'm correct, there was an io error while writing to the external device, which as of 2.6.37 isn't handled terribly well (and errors in general; in that sense, it's known).
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author
#2 lore raw
Quoted 1 line · cwillu

On Tue, Feb 1, 2011 at 3:51 PM, Carlos R. Mafra <[email protected]> =

Quoted 2 lines · wrote:
Quoted 2 lines

I am running 2.6.37 plus the revert of bf9dc102e284 (which is relat=

ed to drm).

Quoted 11 lines
Quoted 11 lines

My /home is on btrfs as well as a 1TB external USB hard-disk.

I was compiling 2.6.38-rc3 from /home/mafra/linux2.6 using the external hd as the destination of the compiled files:

make -j4 O=3D/mnt/wd/kernel-compile

So after some time I got this bug and I was dropped out of X

[ 2730.943101] BUG: unable to handle kernel NULL pointer dereferenc=

e at 0000000000000030

Quoted 4 lines
Quoted 4 lines
[ 2730.943159] IP: [<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x820
[ 2730.943217] PGD 2248f067 PUD 5adc8067 PMD 0
[ 2730.943256] Oops: 0000 [#1] SMP
[ 2730.943285] last sysfs file: /sys/devices/system/cpu/cpu0/cpufre=

q/scaling_cur_freq

Quoted 2 lines
Quoted 2 lines
[ 2730.943331] CPU 0
[ 2730.943346] Modules linked in: ppp_deflate ppp_async ppp_generic=

slhc snd_seq snd_seq_device vfat fat option usb_wwan usbserial snd_hda=
_codec_idt snd_hda_intel iwlagn snd_hda_codec sky2 uvcvideo i2c_i801 sn= d_hwdep evdev

Quoted 2 lines
Quoted 2 lines
[ 2730.943526]
[ 2730.943541] Pid: 15437, comm: as Not tainted 2.6.37-xrandr-00001=

-g1d95a75 #16 VAIO/VGN-FZ240E

Quoted 1 line
Quoted 1 line
[ 2730.943581] RIP: 0010:[<ffffffff811ba3e5>] =C2=A0[<ffffffff811ba=

3e5>] btrfs_print_leaf+0x25/0x820

Quoted 2 lines
Quoted 2 lines
[ 2730.943629] RSP: 0000:ffff88005a771ad8 =C2=A0EFLAGS: 00010287
[ 2730.943661] RAX: 00000000fffffffb RBX: ffff88005b048d90 RCX: fff=

f880037f49d38

Quoted 1 line
Quoted 1 line
[ 2730.943695] RDX: 0000000000000000 RSI: 0000000000000000 RDI: fff=

f88004d456000

Quoted 1 line
Quoted 1 line
[ 2730.943729] RBP: ffff88005a771b58 R08: 00000000fffffffb R09: 000=

0000000000000

Quoted 1 line
Quoted 1 line
[ 2730.943763] R10: 0000000000000001 R11: 00000000ffffffff R12: 000=

0000000000005

Quoted 1 line
Quoted 1 line
[ 2730.943797] R13: ffff88005a771fd8 R14: 0000000000000000 R15: 000=

0000000000000

Quoted 1 line
Quoted 1 line
[ 2730.943831] FS: =C2=A000002b01b9f88000(0000) GS:ffff88007f400000=

(0000) knlGS:0000000000000000

Quoted 1 line
Quoted 1 line
[ 2730.943872] CS: =C2=A00010 DS: 0000 ES: 0000 CR0: 00000000800500=

3b

Quoted 1 line
Quoted 1 line
[ 2730.943901] CR2: 0000000000000030 CR3: 000000006161c000 CR4: 000=

00000000006f0

Quoted 1 line
Quoted 1 line
[ 2730.943934] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000=

0000000000000

Quoted 1 line
Quoted 1 line
[ 2730.943968] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 000=

0000000000400

Quoted 1 line
Quoted 1 line
[ 2730.944002] Process as (pid: 15437, threadinfo ffff88005a770000,=

task ffff88002ffea680)

Quoted 2 lines
Quoted 2 lines
[ 2730.944009] Stack:
[ 2730.944009] =C2=A00000001cc7d27000 ffffffff811e4724 ffff88004d45=

6000 0000001cc7784000

Quoted 1 line
Quoted 1 line
[ 2730.944009] =C2=A0ffff88005a771b58 ffff88005b048d90 0000001cc7d2=

7000 00000000005000a8

Quoted 1 line
Quoted 1 line
[ 2730.944009] =C2=A0ffff8800491a0e00 ffff88006c2de6c0 000000000000=

0005 ffff88005b048d90

Quoted 2 lines
Quoted 2 lines
[ 2730.944009] Call Trace:
[ 2730.944009] =C2=A0[<ffffffff811e4724>] ? set_extent_dirty+0x24/0=

x30

Quoted 1 line
Quoted 1 line
[ 2730.944009] =C2=A0[<ffffffff811b30dd>] __btrfs_free_extent+0x61d=

/0x6e0

Quoted 1 line
Quoted 1 line
[ 2730.944009] =C2=A0[<ffffffff811b635b>] run_clustered_refs+0x1fb/=

0x810

Quoted 1 line
Quoted 1 line
[ 2730.944009] =C2=A0[<ffffffff811e7bda>] ? set_extent_buffer_dirty=

+0x4a/0xa0

Quoted 1 line
Quoted 1 line
[ 2730.944009] =C2=A0[<ffffffff811c342f>] ? btrfs_mark_buffer_dirty=

+0xaf/0x130

Quoted 1 line
Quoted 1 line
[ 2730.944009] =C2=A0[<ffffffff81201100>] ? btrfs_find_ref_cluster+=

0x60/0x190

Quoted 1 line
Quoted 1 line
[ 2730.944009] =C2=A0[<ffffffff811b6a30>] btrfs_run_delayed_refs+0x=

c0/0x210

Quoted 1 line
Quoted 1 line
[ 2730.944009] =C2=A0[<ffffffff811c55b8>] __btrfs_end_transaction+0=

x68/0x240

Quoted 1 line
Quoted 1 line
[ 2730.944009] =C2=A0[<ffffffff811c57d0>] btrfs_end_transaction+0x1=

0/0x20

Quoted 1 line
Quoted 1 line
[ 2730.944009] =C2=A0[<ffffffff811ced57>] btrfs_evict_inode+0x1c7/0=

x1e0

Quoted 6 lines
Quoted 6 lines
[ 2730.944009] =C2=A0[<ffffffff810fa8c2>] evict+0x22/0xb0
[ 2730.944009] =C2=A0[<ffffffff810fb141>] iput+0x1b1/0x290
[ 2730.944009] =C2=A0[<ffffffff810f14f5>] do_unlinkat+0x115/0x1c0
[ 2730.944009] =C2=A0[<ffffffff810e94ae>] ? sys_newlstat+0x2e/0x40
[ 2730.944009] =C2=A0[<ffffffff810f2af1>] sys_unlink+0x11/0x20
[ 2730.944009] =C2=A0[<ffffffff81002cfb>] system_call_fastpath+0x16=

/0x1b

Quoted 1 line
Quoted 1 line
[ 2730.944009] Code: 84 00 00 00 00 00 55 48 89 e5 48 83 c4 80 48 8=

9 5d d8 4c 89 6d e8 4c 89 65 e0 4c 89 75 f0 4c 89 7d f8 65 4c 8b 2c 25 = 88 b5 00 00 <48> 8b 46 30 49 81 ed d8 1f 00 00 48 89 f3 41 ff 45 1c 48 = ba 00

Quoted 1 line
Quoted 1 line
[ 2730.944009] RIP =C2=A0[<ffffffff811ba3e5>] btrfs_print_leaf+0x25=

/0x820

Quoted 4 lines
Quoted 4 lines
[ 2730.944009] =C2=A0RSP <ffff88005a771ad8>
[ 2730.944009] CR2: 0000000000000030
[ 2730.950886] ---[ end trace 3c2d14569018819f ]---
[ 2731.229129] BUG: unable to handle kernel NULL pointer dereferenc=

e at 0000000000000030

Quoted 4 lines
Quoted 4 lines
[ 2731.230010] IP: [<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x820
[ 2731.230010] PGD 22623067 PUD 2278d067 PMD 0
[ 2731.230010] Oops: 0000 [#2] SMP
[ 2731.230010] last sysfs file: /sys/devices/system/cpu/cpu0/cpufre=

q/scaling_cur_freq

Quoted 2 lines
Quoted 2 lines
[ 2731.230010] CPU 1
[ 2731.230010] Modules linked in: ppp_deflate ppp_async ppp_generic=

slhc snd_seq snd_seq_device vfat fat option usb_wwan usbserial snd_hda=
_codec_idt snd_hda_intel iwlagn snd_hda_codec sky2 uvcvideo i2c_i801 sn= d_hwdep evdev

Quoted 2 lines
Quoted 2 lines
[ 2731.230010]
[ 2731.230010] Pid: 15444, comm: as Tainted: G =C2=A0 =C2=A0 =C2=A0=

D =C2=A0 =C2=A0 2.6.37-xrandr-00001-g1d95a75 #16 VAIO/VGN-FZ240E

Quoted 1 line
Quoted 1 line
[ 2731.230010] RIP: 0010:[<ffffffff811ba3e5>] =C2=A0[<ffffffff811ba=

3e5>] btrfs_print_leaf+0x25/0x820

Quoted 2 lines
Quoted 2 lines
[ 2731.230010] RSP: 0000:ffff88004d42dad8 =C2=A0EFLAGS: 00010287
[ 2731.230010] RAX: 00000000fffffffb RBX: ffff88005b048b50 RCX: fff=

f880037f49d38

Quoted 1 line
Quoted 1 line
[ 2731.230010] RDX: 0000000000000000 RSI: 0000000000000000 RDI: fff=

f88004d456000

Quoted 1 line
Quoted 1 line
[ 2731.230010] RBP: ffff88004d42db58 R08: 00000000fffffffb R09: 000=

0000000000000

Quoted 1 line
Quoted 1 line
[ 2731.230010] R10: 0000000000000001 R11: 00000000ffffffff R12: 000=

0000000000005

Quoted 1 line
Quoted 1 line
[ 2731.230010] R13: ffff88004d42dfd8 R14: 0000000000000000 R15: 000=

0000000000000

Quoted 1 line
Quoted 1 line
[ 2731.230010] FS: =C2=A000002aac5cec6000(0000) GS:ffff88007f500000=

(0000) knlGS:0000000000000000

Quoted 1 line
Quoted 1 line
[ 2731.230010] CS: =C2=A00010 DS: 0000 ES: 0000 CR0: 00000000800500=

3b

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Quoted 1 line
[ 2731.230010] CR2: 0000000000000030 CR3: 00000000226af000 CR4: 000=

00000000006e0

Quoted 1 line
Quoted 1 line
[ 2731.230010] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000=

0000000000000

Quoted 1 line
Quoted 1 line
[ 2731.230010] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 000=

0000000000400

Quoted 1 line
Quoted 1 line
[ 2731.230010] Process as (pid: 15444, threadinfo ffff88004d42c000,=

task ffff88007b69e280)

Quoted 2 lines
Quoted 2 lines
[ 2731.230010] Stack:
[ 2731.230010] =C2=A00000001cc7d2c000 ffffffff811dd7c5 ffff88004d45=

6000 ffff8800218b8898

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Quoted 1 line
[ 2731.230010] =C2=A0ffff88004d42dba8 ffff88005b048b50 0000001cc7d2=

c000 00000000005000a8

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Quoted 1 line
[ 2731.230010] =C2=A0ffff88004d42db00 ffff88005a5e5cc0 000000000000=

0005 ffff88005b048b50

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Quoted 2 lines
[ 2731.230010] Call Trace:
[ 2731.230010] =C2=A0[<ffffffff811dd7c5>] ? btrfs_key_generation+0x=

e5/0xf0

Quoted 1 line
Quoted 1 line
[ 2731.230010] =C2=A0[<ffffffff811b30dd>] __btrfs_free_extent+0x61d=

/0x6e0

Quoted 1 line
Quoted 1 line
[ 2731.230010] =C2=A0[<ffffffff811e7bda>] ? set_extent_buffer_dirty=

+0x4a/0xa0

Quoted 1 line
Quoted 1 line
[ 2731.230010] =C2=A0[<ffffffff811c342f>] ? btrfs_mark_buffer_dirty=

+0xaf/0x130

Quoted 1 line
Quoted 1 line
[ 2731.230010] =C2=A0[<ffffffff811b635b>] run_clustered_refs+0x1fb/=

0x810

Quoted 1 line
Quoted 1 line
[ 2731.230010] =C2=A0[<ffffffff81201100>] ? btrfs_find_ref_cluster+=

0x60/0x190

Quoted 1 line
Quoted 1 line
[ 2731.230010] =C2=A0[<ffffffff811b6a30>] btrfs_run_delayed_refs+0x=

c0/0x210

Quoted 1 line
Quoted 1 line
[ 2731.230010] =C2=A0[<ffffffff811c55b8>] __btrfs_end_transaction+0=

x68/0x240

Quoted 1 line
Quoted 1 line
[ 2731.230010] =C2=A0[<ffffffff811c57d0>] btrfs_end_transaction+0x1=

0/0x20

Quoted 1 line
Quoted 1 line
[ 2731.230010] =C2=A0[<ffffffff811ced1f>] btrfs_evict_inode+0x18f/0=

x1e0

Quoted 6 lines
Quoted 6 lines
[ 2731.230010] =C2=A0[<ffffffff810fa8c2>] evict+0x22/0xb0
[ 2731.230010] =C2=A0[<ffffffff810fb141>] iput+0x1b1/0x290
[ 2731.230010] =C2=A0[<ffffffff810f14f5>] do_unlinkat+0x115/0x1c0
[ 2731.230010] =C2=A0[<ffffffff810e94ae>] ? sys_newlstat+0x2e/0x40
[ 2731.230010] =C2=A0[<ffffffff810f2af1>] sys_unlink+0x11/0x20
[ 2731.230010] =C2=A0[<ffffffff81002cfb>] system_call_fastpath+0x16=

/0x1b

Quoted 1 line
Quoted 1 line
[ 2731.230010] Code: 84 00 00 00 00 00 55 48 89 e5 48 83 c4 80 48 8=

9 5d d8 4c 89 6d e8 4c 89 65 e0 4c 89 75 f0 4c 89 7d f8 65 4c 8b 2c 25 = 88 b5 00 00 <48> 8b 46 30 49 81 ed d8 1f 00 00 48 89 f3 41 ff 45 1c 48 = ba 00

Quoted 1 line
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[ 2731.230010] RIP =C2=A0[<ffffffff811ba3e5>] btrfs_print_leaf+0x25=

/0x820

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Quoted 4 lines
[ 2731.230010] =C2=A0RSP <ffff88004d42dad8>
[ 2731.230010] CR2: 0000000000000030
[ 2731.304076] ---[ end trace 3c2d1456901881a0 ]---
[ 2731.778512] BUG: unable to handle kernel NULL pointer dereferenc=

e at 0000000000000030

Quoted 4 lines
Quoted 4 lines
[ 2731.779007] IP: [<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x820
[ 2731.779007] PGD 2ffa8067 PUD 5a93d067 PMD 0
[ 2731.779007] Oops: 0000 [#3] SMP
[ 2731.779007] last sysfs file: /sys/devices/system/cpu/cpu0/cpufre=

q/scaling_cur_freq

Quoted 2 lines
Quoted 2 lines
[ 2731.779007] CPU 0
[ 2731.779007] Modules linked in: ppp_deflate ppp_async ppp_generic=

slhc snd_seq snd_seq_device vfat fat option usb_wwan usbserial snd_hda=
_codec_idt snd_hda_intel iwlagn snd_hda_codec sky2 uvcvideo i2c_i801 sn= d_hwdep evdev

Quoted 2 lines
Quoted 2 lines
[ 2731.779007]
[ 2731.779007] Pid: 15448, comm: as Tainted: G =C2=A0 =C2=A0 =C2=A0=

D =C2=A0 =C2=A0 2.6.37-xrandr-00001-g1d95a75 #16 VAIO/VGN-FZ240E

Quoted 1 line
Quoted 1 line
[ 2731.779007] RIP: 0010:[<ffffffff811ba3e5>] =C2=A0[<ffffffff811ba=

3e5>] btrfs_print_leaf+0x25/0x820

Quoted 2 lines
Quoted 2 lines
[ 2731.779007] RSP: 0018:ffff8800227c5ad8 =C2=A0EFLAGS: 00010287
[ 2731.779007] RAX: 00000000fffffffb RBX: ffff88005b048c70 RCX: fff=

f880021f9fd38

Quoted 1 line
Quoted 1 line
[ 2731.779007] RDX: 0000000000000000 RSI: 0000000000000000 RDI: fff=

f88004d456000

Quoted 1 line
Quoted 1 line
[ 2731.779007] RBP: ffff8800227c5b58 R08: 00000000fffffffb R09: 000=

0000000000000

Quoted 1 line
Quoted 1 line
[ 2731.779007] R10: 0000000000000001 R11: 00000000ffffffff R12: 000=

0000000000005

Quoted 1 line
Quoted 1 line
[ 2731.779007] R13: ffff8800227c5fd8 R14: 0000000000000000 R15: 000=

0000000000000

Quoted 1 line
Quoted 1 line
[ 2731.779007] FS: =C2=A000002b0f18c8e000(0000) GS:ffff88007f400000=

(0000) knlGS:0000000000000000

Quoted 1 line
Quoted 1 line
[ 2731.779007] CS: =C2=A00010 DS: 0000 ES: 0000 CR0: 00000000800500=

3b

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Quoted 1 line
[ 2731.779007] CR2: 0000000000000030 CR3: 000000006c0b5000 CR4: 000=

00000000006f0

Quoted 1 line
Quoted 1 line
[ 2731.779007] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000=

0000000000000

Quoted 1 line
Quoted 1 line
[ 2731.779007] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 000=

0000000000400

Quoted 1 line
Quoted 1 line
[ 2731.779007] Process as (pid: 15448, threadinfo ffff8800227c4000,=

task ffff88003acfc5c0)

Quoted 2 lines
Quoted 2 lines
[ 2731.779007] Stack:
[ 2731.779007] =C2=A00000001cc7d3c000 ffffffff811dd7c5 ffff88004d45=

6000 ffff8800218b21f0

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Quoted 1 line
[ 2731.779007] =C2=A0ffff8800227c5ba8 ffff88005b048c70 0000001cc7d3=

c000 00000000005000a8

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Quoted 1 line
[ 2731.779007] =C2=A0ffff8800227c5b00 ffff88007229ea40 000000000000=

0005 ffff88005b048c70

Quoted 2 lines
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[ 2731.779007] Call Trace:
[ 2731.779007] =C2=A0[<ffffffff811dd7c5>] ? btrfs_key_generation+0x=

e5/0xf0

Quoted 1 line
Quoted 1 line
[ 2731.779007] =C2=A0[<ffffffff811b30dd>] __btrfs_free_extent+0x61d=

/0x6e0

Quoted 1 line
Quoted 1 line
[ 2731.779007] =C2=A0[<ffffffff811dd9b4>] ? btrfs_item_offset+0xe4/=

0xf0

Quoted 1 line
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[ 2731.779007] =C2=A0[<ffffffff811b635b>] run_clustered_refs+0x1fb/=

0x810

Quoted 1 line
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[ 2731.779007] =C2=A0[<ffffffff811e7bda>] ? set_extent_buffer_dirty=

+0x4a/0xa0

Quoted 1 line
Quoted 1 line
[ 2731.779007] =C2=A0[<ffffffff811c342f>] ? btrfs_mark_buffer_dirty=

+0xaf/0x130

Quoted 1 line
Quoted 1 line
[ 2731.779007] =C2=A0[<ffffffff81201100>] ? btrfs_find_ref_cluster+=

0x60/0x190

Quoted 1 line
Quoted 1 line
[ 2731.779007] =C2=A0[<ffffffff811b6a30>] btrfs_run_delayed_refs+0x=

c0/0x210

Quoted 1 line
Quoted 1 line
[ 2731.779007] =C2=A0[<ffffffff811c55b8>] __btrfs_end_transaction+0=

x68/0x240

Quoted 1 line
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[ 2731.779007] =C2=A0[<ffffffff811c57d0>] btrfs_end_transaction+0x1=

0/0x20

Quoted 1 line
Quoted 1 line
[ 2731.779007] =C2=A0[<ffffffff811ced57>] btrfs_evict_inode+0x1c7/0=

x1e0

Quoted 6 lines
Quoted 6 lines
[ 2731.779007] =C2=A0[<ffffffff810fa8c2>] evict+0x22/0xb0
[ 2731.779007] =C2=A0[<ffffffff810fb141>] iput+0x1b1/0x290
[ 2731.779007] =C2=A0[<ffffffff810f14f5>] do_unlinkat+0x115/0x1c0
[ 2731.779007] =C2=A0[<ffffffff810e94ae>] ? sys_newlstat+0x2e/0x40
[ 2731.779007] =C2=A0[<ffffffff810f2af1>] sys_unlink+0x11/0x20
[ 2731.779007] =C2=A0[<ffffffff81002cfb>] system_call_fastpath+0x16=

/0x1b

Quoted 1 line
Quoted 1 line
[ 2731.779007] Code: 84 00 00 00 00 00 55 48 89 e5 48 83 c4 80 48 8=

9 5d d8 4c 89 6d e8 4c 89 65 e0 4c 89 75 f0 4c 89 7d f8 65 4c 8b 2c 25 = 88 b5 00 00 <48> 8b 46 30 49 81 ed d8 1f 00 00 48 89 f3 41 ff 45 1c 48 = ba 00

Quoted 1 line
Quoted 1 line
[ 2731.779007] RIP =C2=A0[<ffffffff811ba3e5>] btrfs_print_leaf+0x25=

/0x820

Quoted 4 lines
Quoted 4 lines
[ 2731.779007] =C2=A0RSP <ffff8800227c5ad8>
[ 2731.779007] CR2: 0000000000000030
[ 2731.855520] ---[ end trace 3c2d1456901881a1 ]---
[ 2732.101887] btrfs csum failed ino 244904 extent 124692799488 csu=

m 4201110721 wanted 126609361 mirror 0

Quoted 1 line
Quoted 1 line
[ 2732.102064] btrfs csum failed ino 244904 extent 124692799488 csu=

m 2566472073 wanted 126609361 mirror 1

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Quoted 1 line
[ 2732.102084] btrfs csum failed ino 244904 extent 124692799488 csu=

m 2566472073 wanted 126609361 mirror 1

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[ 2732.102102] btrfs csum failed ino 244904 extent 124692799488 csu=

m 2566472073 wanted 126609361 mirror 1

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[ 2732.102121] btrfs csum failed ino 244904 extent 124692799488 csu=

m 2566472073 wanted 126609361 mirror 1

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[ 2732.102139] btrfs csum failed ino 244904 extent 124692799488 csu=

m 2566472073 wanted 126609361 mirror 1

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[ 2732.102158] btrfs csum failed ino 244904 extent 124692799488 csu=

m 2566472073 wanted 126609361 mirror 1

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[ 2732.102176] btrfs csum failed ino 244904 extent 124692799488 csu=

m 2566472073 wanted 126609361 mirror 1

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[ 2732.102195] btrfs csum failed ino 244904 extent 124692799488 csu=

m 2566472073 wanted 126609361 mirror 1

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[ 2732.102213] btrfs csum failed ino 244904 extent 124692799488 csu=

m 2566472073 wanted 126609361 mirror 1

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[ 2732.102231] btrfs csum failed ino 244904 extent 124692799488 csu=

m 2566472073 wanted 126609361 mirror 1

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[ 2732.102250] btrfs csum failed ino 244904 extent 124692799488 csu=

m 2566472073 wanted 126609361 mirror 1

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[ 2732.103048] btrfs csum failed ino 244904 extent 124692799488 csu=

m 2566472073 wanted 126609361 mirror 0

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[ 2732.103086] btrfs csum failed ino 244904 extent 124692799488 csu=

m 2566472073 wanted 126609361 mirror 1

Quoted 1 line
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[ 2738.344564] btrfs csum failed ino 244835 extent 124686446592 csu=

m 4201110721 wanted 3023272677 mirror 0

Quoted 1 line
Quoted 1 line
[ 2738.344662] btrfs csum failed ino 244835 extent 124686446592 csu=

m 2566472073 wanted 3023272677 mirror 1

Quoted 1 line
Quoted 1 line
[ 2738.344683] btrfs csum failed ino 244835 extent 124686446592 csu=

m 4201110721 wanted 3023272677 mirror 1

Quoted 1 line
Quoted 1 line
[ 2738.344702] btrfs csum failed ino 244835 extent 124686446592 csu=

m 2566472073 wanted 3023272677 mirror 1

Quoted 1 line
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[ 2738.344729] btrfs csum failed ino 244835 extent 124686446592 csu=

m 2566472073 wanted 3023272677 mirror 1

Quoted 1 line
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[ 2738.344748] btrfs csum failed ino 244835 extent 124686446592 csu=

m 2566472073 wanted 3023272677 mirror 1

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[ 2738.344752] btrfs csum failed ino 244835 extent 124686446592 csu=

m 2566472073 wanted 3023272677 mirror 1

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[ 2738.344768] btrfs csum failed ino 244835 extent 124686446592 csu=

m 2566472073 wanted 3023272677 mirror 1

Quoted 1 line
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[ 2738.344772] btrfs csum failed ino 244835 extent 124686446592 csu=

m 2566472073 wanted 3023272677 mirror 1

Quoted 1 line
Quoted 1 line
[ 2738.344792] btrfs csum failed ino 244835 extent 124686446592 csu=

m 2566472073 wanted 3023272677 mirror 1

Quoted 1 line
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[ 2738.344823] btrfs csum failed ino 244835 extent 124686446592 csu=

m 2566472073 wanted 3023272677 mirror 1

Quoted 1 line
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[ 2738.344843] btrfs csum failed ino 244835 extent 124686446592 csu=

m 2566472073 wanted 3023272677 mirror 1

Quoted 1 line
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[ 2738.344862] btrfs csum failed ino 244835 extent 124686446592 csu=

m 2566472073 wanted 3023272677 mirror 1

Quoted 1 line
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[ 2738.344884] btrfs csum failed ino 244835 extent 124686446592 csu=

m 2566472073 wanted 3023272677 mirror 0

Quoted 1 line
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[ 2738.344932] btrfs csum failed ino 244835 extent 124686446592 csu=

m 2566472073 wanted 3023272677 mirror 1

Quoted 7 lines
Quoted 3 lines

Is this problem already known?

=20
Was there anything else before the first bug in dmesg? I would predict there to have been some additional debugging info, and probably a USB device disconnect or similar.

Thanks a lot, cwillu!

Indeed there were USB-related errors a bit before the BUG. I thought th= ey
were related to the usb surfstick I was using, which was quite unstable=
and
disconnecting.

[ 2725.465125] usb 2-2: reset high speed USB device using ehci_hcd and =
address 23
[ 2725.589040] usb 2-2: device descriptor read/64, error -71
[ 2725.964048] usb 2-2: device descriptor read/64, error -71
[ 2726.167037] usb 2-2: reset high speed USB device using ehci_hcd and =
address 23
[ 2726.680029] usb 2-2: device not accepting address 23, error -71
[ 2726.782042] usb 2-2: reset high speed USB device using ehci_hcd and =
address 23
[ 2727.192028] usb 2-2: device not accepting address 23, error -71
[ 2727.294050] usb 2-2: reset high speed USB device using ehci_hcd and =
address 23
[ 2727.704034] usb 2-2: device not accepting address 23, error -71
[ 2727.704074] usb 2-2: USB disconnect, address 23
[ 2727.704120] sd 18:0:0:0: [sdc] Unhandled error code
[ 2727.704123] sd 18:0:0:0: [sdc]  Result: hostbyte=3D0x07 driverbyte=3D=
0x00
[ 2727.704126] sd 18:0:0:0: [sdc] CDB: cdb[0]=3D0x2a: 2a 00 18 db 83 a0=
 00 00 20 00
[ 2727.704135] end_request: I/O error, dev sdc, sector 417039264
[ 2727.704154] sd 18:0:0:0: [sdc] Unhandled error code
[ 2727.704156] sd 18:0:0:0: [sdc]  Result: hostbyte=3D0x01 driverbyte=3D=
0x00
[ 2727.704159] sd 18:0:0:0: [sdc] CDB: cdb[0]=3D0x2a: 2a 00 18 db 83 c0=
 00 00 38 00
[ 2727.704167] end_request: I/O error, dev sdc, sector 417039296
[ 2727.812050] usb 2-2: new high speed USB device using ehci_hcd and ad=
dress 24
[ 2727.926040] usb 2-2: device descriptor read/64, error -71
[ 2728.154579] scsi19 : usb-storage 2-2:1.0
[ 2729.167448] scsi 19:0:0:0: Direct-Access     WD       Elements 1023 =
   2005 PQ: 0 ANSI: 4
[ 2729.167769] sd 19:0:0:0: Attached scsi generic sg4 type 0
[ 2729.169305] sd 19:0:0:0: [sdd] 1953519616 512-byte logical blocks: (=
1.00 TB/931 GiB)
[ 2729.170174] sd 19:0:0:0: [sdd] Test WP failed, assume Write Enabled
[ 2729.170179] sd 19:0:0:0: [sdd] Assuming drive cache: write through
[ 2729.171920] sd 19:0:0:0: [sdd] Test WP failed, assume Write Enabled
[ 2729.171923] sd 19:0:0:0: [sdd] Assuming drive cache: write through
[ 2729.200964]  sdd: sdd1
[ 2729.203180] sd 19:0:0:0: [sdd] Test WP failed, assume Write Enabled
[ 2729.203185] sd 19:0:0:0: [sdd] Assuming drive cache: write through
[ 2729.203189] sd 19:0:0:0: [sdd] Attached SCSI disk
[ 2730.943101] BUG: unable to handle kernel NULL pointer dereference at=
 0000000000000030
[ 2730.943159] IP: [<ffffffff811ba3e5>] btrfs_print_leaf+0x25/0x820
Quoted 3 lines

If I'm correct, there was an io error while writing to the external device, which as of 2.6.37 isn't handled terribly well (and errors in general; in that sense, it's known).

Ok, now I am moving to 2.6.38-rc3 and I'll pay attention to usb failure= s
before reporting anything.

Thanks again!
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