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[Bug 733843] random Crash with : kernel BUG /.../fs/btrfs/inode.c:785!

https://bugzilla.novell.com/show_bug.cgi?id=733843

https://bugzilla.novell.com/show_bug.cgi?id=733843#c3


Roger Whittaker <rwhittaker@xxxxxxxx> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |rwhittaker@xxxxxxxx

--- Comment #3 from Roger Whittaker <rwhittaker@xxxxxxxx> 2011-12-16 17:23:34
UTC ---
I have just suffered this. / and /home on separate btrfs partitions. /home
seems to have been the one that was affected, because I could still log in by
ssh as root, but the ls command would hang under /home/

Prior to the event there quite a few messages like this:
Dec 16 16:09:17 snark kernel: [ 379.192193] btrfs: free space inode generation
(0) did not match free space cache generation (47162)

then this, corresponding to a sudden blank screen.

Dec 16 17:00:11 snark kernel: [ 3432.860051] ------------[ cut here
]------------
Dec 16 17:00:11 snark kernel: [ 3432.860059] kernel BUG at
/home/abuild/rpmbuild/BUILD/kernel-desktop-3.1.0/linux-3.1/fs/btrfs/inode.c:785!

Dec 16 17:00:11 snark kernel: [ 3432.860064] invalid opcode: 0000 [#1] PREEMPT
SMP
Dec 16 17:00:11 snark kernel: [ 3432.860069] CPU 1
Dec 16 17:00:11 snark kernel: [ 3432.860070] Modules linked in: fuse af_packet
rfcomm snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device bnep edd vboxpci
vboxnetadp vboxnetflt nfs lockd fscache auth_rpcgss nfs_acl sunrpc vboxdrv
microcode cpufreq_conservative cpufreq_user\
space cpufreq_powersave acpi_cpufreq mperf pciehp pci_hotplug ecb btusb
bluetooth firewire_ohci dell_laptop sr_mod firewire_core ppdev arc4 sg dell_wmi
sparse_keymap dcdbas tg3 cdrom snd_hda_codec_idt pcmcia iwl3945 iwl_legacy
kvm_intel kvm snd_hda_intel snd_hda_codec y\
enta_socket pcmcia_rsrc pcmcia_core pcspkr iTCO_wdt iTCO_vendor_support
i2c_i801 snd_hwdep snd_pcm mac80211 snd_timer snd cfg80211 soundcore crc_itu_t
snd_page_alloc rfkill parport_pc battery ac parport wmi btrfs zlib_deflate i915
drm_kms_helper drm i2c_algo_bit thermal\
processor button video thermal_sys ata_generic
Dec 16 17:00:11 snark kernel: [ 3432.860141]
Dec 16 17:00:11 snark kernel: [ 3432.860144] Pid: 7870, comm: btrfs Not tainted
3.1.0-1.2-desktop #1 Dell Inc. Latitude D830 /0HN341
Dec 16 17:00:11 snark kernel: [ 3432.860150] RIP: 0010:[<ffffffffa01751e5>]
[<ffffffffa01751e5>] cow_file_range+0x395/0x3b0 [btrfs]
Dec 16 17:00:11 snark kernel: [ 3432.860174] RSP: 0018:ffff88005242d608
EFLAGS: 00010246
Dec 16 17:00:11 snark kernel: [ 3432.860177] RAX: ffff88011784c000 RBX:
0000000000001000 RCX: 000000000000ffff
Dec 16 17:00:11 snark kernel: [ 3432.860180] RDX: ffff880115d98000 RSI:
ffffea0001624da0 RDI: ffff8800cddd9d88
Dec 16 17:00:11 snark kernel: [ 3432.860183] RBP: 0000000000000000 R08:
ffff88005242d8a4 R09: ffff88005242d898
Dec 16 17:00:11 snark kernel: [ 3432.860187] R10: 0000000000000002 R11:
dead000000100100 R12: ffff8800cddd9d88
Dec 16 17:00:11 snark kernel: [ 3432.860190] R13: 000000000000ffff R14:
ffff8800cddd9bf0 R15: ffff8800cddd9c10
Dec 16 17:00:11 snark kernel: [ 3432.860194] FS: 00007f607e258740(0000)
GS:ffff88011fd00000(0000) knlGS:0000000000000000
Dec 16 17:00:11 snark kernel: [ 3432.860197] CS: 0010 DS: 0000 ES: 0000 CR0:
000000008005003b
Dec 16 17:00:11 snark kernel: [ 3432.860200] CR2: 00007f8d93418000 CR3:
000000005243b000 CR4: 00000000000006e0
Dec 16 17:00:11 snark kernel: [ 3432.860204] DR0: 0000000000000000 DR1:
0000000000000000 DR2: 0000000000000000
Dec 16 17:00:11 snark kernel: [ 3432.860207] DR3: 0000000000000000 DR6:
00000000ffff0ff0 DR7: 0000000000000400
Dec 16 17:00:11 snark kernel: [ 3432.860211] Process btrfs (pid: 7870,
threadinfo ffff88005242c000, task ffff88007e422640)
Dec 16 17:00:11 snark kernel: [ 3432.860215] Stack:
Dec 16 17:00:11 snark kernel: [ 3432.860217] ffff8800a0c6c600 0000000300000001
000000028ac66000 ffff880090661258
Dec 16 17:00:11 snark kernel: [ 3432.860222] 0000000000000282 0000000000000003
ffff88005242d898 ffff88005242d8a4
Dec 16 17:00:11 snark kernel: [ 3432.860227] ffff880115d98000 ffffffff8103af33
ffffea0001624da0 ffff8800906611d0
Dec 16 17:00:11 snark kernel: [ 3432.860232] Call Trace:
Dec 16 17:00:11 snark kernel: [ 3432.860281] [<ffffffffa017559f>]
run_delalloc_nocow+0x39f/0x780 [btrfs]
Dec 16 17:00:11 snark kernel: [ 3432.860323] [<ffffffffa01759e4>]
run_delalloc_range+0x64/0x80 [btrfs]
Dec 16 17:00:11 snark kernel: [ 3432.860366] [<ffffffffa018a9f4>]
__extent_writepage+0x624/0x790 [btrfs]
Dec 16 17:00:11 snark kernel: [ 3432.860428] [<ffffffffa018ad78>]
extent_write_cache_pages.isra.25.constprop.34+0x218/0x350 [btrfs]
Dec 16 17:00:11 snark kernel: [ 3432.860490] [<ffffffffa018b0df>]
extent_writepages+0x3f/0x60 [btrfs]
Dec 16 17:00:11 snark kernel: [ 3432.860545] [<ffffffff810f764c>]
__filemap_fdatawrite_range+0x4c/0x60
Dec 16 17:00:11 snark kernel: [ 3432.860560] [<ffffffff810f8065>]
filemap_write_and_wait+0x35/0x50
Dec 16 17:00:11 snark kernel: [ 3432.860578] [<ffffffffa01a149a>]
__btrfs_write_out_cache+0x84a/0xa40 [btrfs]
Dec 16 17:00:11 snark kernel: [ 3432.860656] [<ffffffffa01a1728>]
btrfs_write_out_cache+0x98/0x110 [btrfs]
Dec 16 17:00:11 snark kernel: [ 3432.860731] [<ffffffffa015cf03>]
btrfs_write_dirty_block_groups+0x223/0x280 [btrfs]
Dec 16 17:00:11 snark kernel: [ 3432.860762] [<ffffffffa016b6d6>]
update_cowonly_root+0x36/0xc0 [btrfs]
Dec 16 17:00:11 snark kernel: [ 3432.860800] [<ffffffffa016b814>]
commit_cowonly_roots+0xb4/0xf0 [btrfs]
Dec 16 17:00:11 snark kernel: [ 3432.860839] [<ffffffffa016d042>]
btrfs_commit_transaction+0x3d2/0x870 [btrfs]
Dec 16 17:00:11 snark kernel: [ 3432.860880] [<ffffffffa019805b>]
create_snapshot.isra.40+0x1ab/0x1e0 [btrfs]
Dec 16 17:00:11 snark kernel: [ 3432.860951] [<ffffffffa01981dc>]
btrfs_mksubvol+0x14c/0x1e0 [btrfs]
Dec 16 17:00:11 snark kernel: [ 3432.861004] [<ffffffffa01983bc>]
btrfs_ioctl_snap_create_transid+0x14c/0x1a0 [btrfs]
Dec 16 17:00:11 snark kernel: [ 3432.861004] [<ffffffffa0198570>]
btrfs_ioctl_snap_create_v2.constprop.47+0xe0/0xf0 [btrfs]
Dec 16 17:00:11 snark kernel: [ 3432.861004] [<ffffffffa0199575>]
btrfs_ioctl+0x1b5/0x690 [btrfs]
Dec 16 17:00:11 snark kernel: [ 3432.861004] [<ffffffff81164c95>]
do_vfs_ioctl+0x85/0x2e0
Dec 16 17:00:11 snark kernel: [ 3432.861004] [<ffffffff81164f88>]
sys_ioctl+0x98/0xa0
Dec 16 17:00:11 snark kernel: [ 3432.861004] [<ffffffff815a3292>]
system_call_fastpath+0x16/0x1b
Dec 16 17:00:11 snark kernel: [ 3432.861004] [<00007f607d986c67>]
0x7f607d986c66
Dec 16 17:00:11 snark kernel: [ 3432.861004] Code: 0c 4c 01 10 c7 02 01 00 00
00 e9 40 ff ff ff 48 8b 7c 24 48 4c 89 e6 4c 89 54 24 28 e8 75 6f 00 00 4c 8b
54 24 28 e9 37 fd ff ff <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b 0f 0b 66 66 66 66 66 66
2e 0f 1f
Dec 16 17:00:11 snark kernel: [ 3432.861004] RIP [<ffffffffa01751e5>]
cow_file_range+0x395/0x3b0 [btrfs]
Dec 16 17:00:11 snark kernel: [ 3432.861004] RSP <ffff88005242d608>
Dec 16 17:00:11 snark kernel: [ 3432.891268] [drm] Changing LVDS panel from
(-hsync, +vsync) to (-hsync, -vsync)
Dec 16 17:00:11 snark kernel: [ 3432.952519] ---[ end trace 29c67c00a5697360
]---

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