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[Krittika <krittika.kalra@xxxxxxxxx>]

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Krittika (krittika-kalra)

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https://bugs.launchpad.net/bugs/999909

Title:
  Btrfs crashes after checksum failure

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I have a btfs  filesystem for /var. I get the following errors on
  dmesg:

  [  149.949666] btrfs csum failed ino 339714 off 103366656 csum 2566472073 private 3685698411
  [  164.378076] btrfs csum failed ino 339714 off 103366656 csum 2566472073 private 3685698411
  [  164.405156] btrfs csum failed ino 339714 off 103366656 csum 2566472073 private 3685698411
  [  164.405326] btrfs csum failed ino 339714 off 103366656 csum 2566472073 private 3685698411
  [  164.405498] btrfs csum failed ino 339714 off 103366656 csum 2566472073 private 3685698411
  [  164.405709] btrfs csum failed ino 339714 off 103366656 csum 2566472073 private 3685698411
  [  164.405877] btrfs csum failed ino 339714 off 103366656 csum 2566472073 private 3685698411

  This inode corresponds to the file
  /var/lib/mythconverg/recordedseek.MYI. When I run a CHECK TABLE on
  this in mysql, it tells me that the table is corrupt, and when I run a
  REPAIR TABLE I get a kernel crash, and mysql hangs indefinitely.

  [  164.405950] ------------[ cut here ]------------
  [  164.405997] kernel BUG at /build/buildd/linux-3.2.0/mm/page-writeback.c:1896!
  [  164.406054] invalid opcode: 0000 [#1] SMP 
  [  164.406071] CPU 1 
  [  164.406078] Modules linked in: bnep rfcomm bluetooth parport_pc ppdev binfmt_misc xfs dm_crypt rc_dib0700_rc5 snd_hda_codec_hdmi snd_hda_codec_realtek ds3000 cx88_dvb cx88_vp3054_i2c videobuf_dvb snd_hda_intel rc_tevii_nec snd_hda_codec ext2 snd_hwdep snd_pcm tuner dvb_usb_dib0700 snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq dib7000p cx8802 dib0090 cx8800 dib7000m dib0070 snd_timer dvb_usb ir_lirc_codec cx88xx lirc_dev snd_seq_device dib8000 ir_mce_kbd_decoder dvb_core ir_sony_decoder ir_jvc_decoder tveeprom v4l2_common ir_rc6_decoder videodev ir_rc5_decoder snd dib3000mc ir_nec_decoder rc_core v4l2_compat_ioctl32 dibx000_common videobuf_dma_sg mei(C) videobuf_core btcx_risc soundcore joydev snd_page_alloc serio_raw mac_hid lm75 it87 hwmon_vid coretemp lp parport btrfs zlib_deflate libcrc32c i915 r8169 usbhid drm_kms_helper drm hid i2c_algo_bit video
  [  164.406406] 
  [  164.406413] Pid: 3272, comm: mysqld Tainted: G         C   3.2.0-24-generic #37-Ubuntu Gigabyte Technology Co., Ltd. H55M-D2H/H55M-S2H
  [  164.406453] RIP: 0010:[<ffffffff81121556>]  [<ffffffff81121556>] clear_page_dirty_for_io+0xf6/0x100
  [  164.406487] RSP: 0018:ffff8800c377fbb8  EFLAGS: 00010246
  [  164.406506] RAX: 0100000000000822 RBX: ffffea0001d276c0 RCX: 00000000000c5f54
  [  164.406528] RDX: 00000000000c5f53 RSI: 00000000000180d0 RDI: ffffea0001d276c0
  [  164.406550] RBP: ffff8800c377fbc8 R08: ffffffffa0173437 R09: 0000000000000000
  [  164.406573] R10: 0000000000000001 R11: 0000000000000001 R12: ffff8800cae91590
  [  164.406594] R13: 0000000000000000 R14: ffff8800c4ac6b00 R15: 0000000000000001
  [  164.406616] FS:  00007f1e09e35700(0000) GS:ffff880117c40000(0000) knlGS:0000000000000000
  [  164.406641] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [  164.406659] CR2: 00007f1db01241d8 CR3: 0000000110b1a000 CR4: 00000000000006e0
  [  164.406681] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  [  164.406702] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
  [  164.406725] Process mysqld (pid: 3272, threadinfo ffff8800c377e000, task ffff8800ca0dc4d0)
  [  164.406751] Stack:
  [  164.406758]  ffff8800c4ac6b00 0000000000000001 ffff8800c377fc88 ffffffffa01670ec
  [  164.406784]  ffff8800c377fc50 0000000000000050 ffff8800c377fc58 ffffffffa014736d
  [  164.406809]  ffff880000000000 0000000000000400 0000000006294c00 0000000000000000
  [  164.406834] Call Trace:
  [  164.406859]  [<ffffffffa01670ec>] prepare_pages.isra.13+0x2ac/0x360 [btrfs]
  [  164.406889]  [<ffffffffa014736d>] ? btrfs_delalloc_reserve_metadata+0x1ed/0x260 [btrfs]
  [  164.406922]  [<ffffffffa0167b26>] __btrfs_buffered_write+0x186/0x340 [btrfs]
  [  164.406954]  [<ffffffffa0167f25>] btrfs_file_aio_write+0x245/0x350 [btrfs]
  [  164.406979]  [<ffffffff810e0405>] ? call_rcu_sched+0x15/0x20
  [  164.406998]  [<ffffffff81177342>] do_sync_write+0xd2/0x110
  [  164.407017]  [<ffffffff812d7448>] ? apparmor_file_permission+0x18/0x20
  [  164.407039]  [<ffffffff8129cc9c>] ? security_file_permission+0x2c/0xb0
  [  164.407060]  [<ffffffff811778d1>] ? rw_verify_area+0x61/0xf0
  [  164.407078]  [<ffffffff81177c33>] vfs_write+0xb3/0x180
  [  164.407095]  [<ffffffff811780f2>] sys_pwrite64+0xa2/0xb0
  [  164.407114]  [<ffffffff81664a82>] system_call_fastpath+0x16/0x1b
  [  164.407133] Code: 66 90 66 90 b8 01 00 00 00 eb 80 66 2e 0f 1f 84 00 00 00 00 00 48 89 df e8 78 fa ff ff eb 82 49 c7 c4 e0 b7 c3 81 e9 3b ff ff ff <0f> 0b 0f 1f 84 00 00 00 00 00 55 48 89 e5 48 83 ec 50 48 89 5d 
  [  164.407263] RIP  [<ffffffff81121556>] clear_page_dirty_for_io+0xf6/0x100
  [  164.407285]  RSP <ffff8800c377fbb8>
  [  164.478985] ---[ end trace 14f7b8308b2bf295 ]---
  [  693.384926]

  The btrfs filesystem has been around for a while, and I've had some
  problems in the past with weird errors. For example, I couldn't
  install a new kernel without booting into a 2.6 kernel first. I don't
  know whether it was the current file system that was the problem or
  not, as I didn't look into it too much once I had a workaround.

  I'll probably end up getting rid of btrfs all round soon, so if anyone
  needs extra information let me know soon.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-24-generic 3.2.0-24.37
  ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
  Uname: Linux 3.2.0-24-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  mythuser   2760 F.... pulseaudio
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xfbff4000 irq 44'
     Mixer name	: 'Intel IbexPeak HDMI'
     Components	: 'HDA:10ec0887,1458a102,00100302 HDA:80862804,80860101,00100000'
     Controls      : 52
     Simple ctrls  : 22
  Date: Tue May 15 21:02:30 2012
  HibernationDevice: RESUME=UUID=38dfaa81-e083-4c0d-b54a-9b5bf45afb2c
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110426)
  IwConfig:
   lo        no wireless extensions.
   
   eth0      no wireless extensions.
  MachineType: Gigabyte Technology Co., Ltd. H55M-D2H
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-24-generic root=/dev/mapper/system-root ro rootflags=subvol=@ enable_mtrr_cleanup mtrr_spare_reg_nr=1 quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-24-generic N/A
   linux-backports-modules-3.2.0-24-generic  N/A
   linux-firmware                            1.79
  RfKill:
   
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: Upgraded to precise on 2012-05-13 (1 days ago)
  dmi.bios.date: 08/20/2010
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F3
  dmi.board.name: H55M-S2H
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF3:bd08/20/2010:svnGigabyteTechnologyCo.,Ltd.:pnH55M-D2H:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnH55M-S2H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: H55M-D2H
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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