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[Colin Ian King <1413008@xxxxxxxxxxxxxxxxxx>]

The above patch won't backport to 3.16, also I can't reproduce the issue
on 3.16, but can with 3.18 w/o the above fix.

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https://bugs.launchpad.net/bugs/1413008

Title:
  Kernel BUG shortly after mounting btrfs filesystem

Status in linux package in Ubuntu:
  Confirmed

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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