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[Chris Halse Rogers <chris@xxxxxxxxxxxxxx>]

Relevant snippet of dmesg:

[   70.591237] BTRFS info (device sdd): disk space caching is enabled
[   71.428714] BTRFS: bdev /dev/sdc errs: wr 0, rd 0, flush 0, corrupt 371004212, gen 0
[  102.225649] ------------[ cut here ]------------
[  102.225748] kernel BUG at /build/buildd/linux-3.18.0/fs/btrfs/inode.c:3123!
[  102.225871] invalid opcode: 0000 [#1] SMP 
[  102.225950] Modules linked in: radeon kvm_amd kvm ttm amd64_edac_mod drm_kms_helper k10temp edac_core edac_mce_amd drm i2c_algo_bit tpm_infineon sp5100_tco i2c_piix4 shpchp mac_hid autofs4 btrfs xor raid6_pq pata_acpi hid_generic tg3 usbhid hid pata_atiixp ptp pps_core ahci libahci
[  102.226483] CPU: 1 PID: 1456 Comm: btrfs-cleaner Not tainted 3.18.0-9-generic #10-Ubuntu
[  102.226624] Hardware name: HP ProLiant MicroServer, BIOS O41     10/01/2013
[  102.226748] task: ffff8800d2aaa800 ti: ffff8800d2ba8000 task.ti: ffff8800d2ba8000
[  102.226878] RIP: 0010:[<ffffffffc03dd210>]  [<ffffffffc03dd210>] btrfs_orphan_add+0x1c0/0x1e0 [btrfs]
[  102.227089] RSP: 0018:ffff8800d2babc38  EFLAGS: 00010286
[  102.227183] RAX: 00000000ffffffe4 RBX: ffff88011914b800 RCX: ffff8800d193d000
[  102.227306] RDX: 000000000000019a RSI: 0000000000040000 RDI: ffff8800d193d138
[  102.227429] RBP: ffff8800d2babc78 R08: ffff8800d0e0f7b8 R09: ffffffffc03ad66a
[  102.227551] R10: ffff88011fc9cbe0 R11: ffffea00046ca040 R12: ffff8800d0e19910
[  102.227674] R13: ffff88011b0d62c0 R14: ffff88011914bc58 R15: 0000000000000001
[  102.227798] FS:  00007fcbf6678700(0000) GS:ffff88011fc80000(0000) knlGS:0000000000000000
[  102.227938] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[  102.228038] CR2: 00007fcbf5260d68 CR3: 00000000d2fd7000 CR4: 00000000000007e0
[  102.228160] Stack:
[  102.228197]  ffff8800d2babc78 ffffffffc041b61d ffff8800d193d000 ffff8800d0b66000
[  102.228334]  ffff88011b281120 0000000000000002 ffff8800d0e19910 ffff8800d2ae7600
[  102.228470]  ffff8800d2babd08 ffffffffc03c6d66 ffff88011b281128 ffff88011b2811a0
[  102.228605] Call Trace:
[  102.228695]  [<ffffffffc041b61d>] ? lookup_free_space_inode+0xcd/0xf0 [btrfs]
[  102.228847]  [<ffffffffc03c6d66>] btrfs_remove_block_group+0x136/0x520 [btrfs]
[  102.229012]  [<ffffffffc040097b>] btrfs_remove_chunk+0x68b/0x800 [btrfs]
[  102.229157]  [<ffffffffc03c736e>] btrfs_delete_unused_bgs+0x21e/0x250 [btrfs]
[  102.229308]  [<ffffffffc03cee24>] cleaner_kthread+0x154/0x1b0 [btrfs]
[  102.229449]  [<ffffffffc03cecd0>] ? check_leaf+0x360/0x360 [btrfs]
[  102.229563]  [<ffffffff810949fb>] kthread+0xdb/0x100
[  102.229655]  [<ffffffff81094920>] ? kthread_create_on_node+0x1c0/0x1c0
[  102.229773]  [<ffffffff817b51bc>] ret_from_fork+0x7c/0xb0
[  102.229870]  [<ffffffff81094920>] ? kthread_create_on_node+0x1c0/0x1c0
[  102.229983] Code: 60 04 00 00 e9 b0 fe ff ff 66 90 89 45 c8 f0 41 80 64 24 80 fd 4c 89 e7 e8 ee 23 fe ff 8b 45 c8 e9 1b ff ff ff 66 0f 1f 44 00 00 <0f> 0b b8 f4 ff ff ff e9 10 ff ff ff 4c 89 f7 45 31 f6 e8 29 7b 
[  102.230511] RIP  [<ffffffffc03dd210>] btrfs_orphan_add+0x1c0/0x1e0 [btrfs]
[  102.230669]  RSP <ffff8800d2babc38>
[  102.230794] ---[ end trace 7bb8d319159a4c32 ]---

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1413008

Title:
  Kernel BUG shortly after mounting btrfs filesystem

Status in linux package in Ubuntu:
  New

Bug description:
  This bug happens entirely reproducibly after mounting a multi-disc
  btrfs filesystem I have. It is reproducible on the current Vivid 3.18
  kernel and the mainline 3.19-rc5 build; I recall this bug also
  happening on Utopic's 3.16 kernel, but don't have logs.

  All processes that touch the filesystem then hang indefinitely in the
  kernel.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.18.0-9-generic 3.18.0-9.10
  ProcVersionSignature: Ubuntu 3.18.0-9.10-generic 3.18.2
  Uname: Linux 3.18.0-9-generic x86_64
  AlsaDevices:
   total 0
   crw-rw----+ 1 root audio 116,  1 Jan 21 10:03 seq
   crw-rw----+ 1 root audio 116, 33 Jan 21 10:03 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.15.1-0ubuntu2
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Wed Jan 21 10:05:37 2015
  InstallationDate: Installed on 2015-01-20 (0 days ago)
  InstallationMedia: Ubuntu-Server 15.04 "Vivid Vervet" - Alpha amd64 (20150116)
  IwConfig:
   lo        no wireless extensions.
   
   em1       no wireless extensions.
  MachineType: HP ProLiant MicroServer
  PciMultimedia:
   
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.18.0-9-generic root=UUID=b5d97f60-81e7-4dd8-a8a7-b2bfef3eeb52 ro rootflags=subvol=@ init=/lib/systemd/systemd
  RelatedPackageVersions:
   linux-restricted-modules-3.18.0-9-generic N/A
   linux-backports-modules-3.18.0-9-generic  N/A
   linux-firmware                            1.140
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/01/2013
  dmi.bios.vendor: HP
  dmi.bios.version: O41
  dmi.chassis.type: 7
  dmi.chassis.vendor: HP
  dmi.modalias: dmi:bvnHP:bvrO41:bd10/01/2013:svnHP:pnProLiantMicroServer:pvr:cvnHP:ct7:cvr:
  dmi.product.name: ProLiant MicroServer
  dmi.sys.vendor: HP

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