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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Did this issue start happening after an update/upgrade? Was there a
kernel version where you were not having this particular problem? This
will help determine if the problem you are seeing is the result of a
regression, and when this regression was introduced.   If this is a
regression, we can perform a kernel bisect to identify the commit that
introduced the problem.

** Changed in: linux (Ubuntu)
   Importance: Critical => High

** Also affects: linux (Ubuntu Wily)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Wily)
       Status: New => Triaged

** Changed in: linux (Ubuntu Wily)
   Importance: Undecided => High

** Tags added: kernel-da-key

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https://bugs.launchpad.net/bugs/1529146

Title:
  btrfs balance leads to kernel panic

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Wily:
  Triaged

Bug description:
  Running rebalance on a 3 drive btrfs volume with both data and
  metadata set to raid1 leads to a kernel panic.  In my case everything
  is on BTRFS so the only way I was able to capture the attached
  backtrace was by sending syslog messages to another server.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-22-generic 4.2.0-22.27
  ProcVersionSignature: Ubuntu 4.2.0-22.27-generic 4.2.6
  Uname: Linux 4.2.0-22-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Dec 24 10:52 seq
   crw-rw---- 1 root audio 116, 33 Dec 24 10:52 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.19.1-0ubuntu5
  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: Thu Dec 24 13:47:46 2015
  HibernationDevice: RESUME=UUID=9087f95c-b9c5-4b2e-8837-758c7f9e978c
  InstallationDate: Installed on 2015-12-04 (19 days ago)
  InstallationMedia: Ubuntu-Server 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: Supermicro H8SGL
  PciMultimedia:
   
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/@boot/vmlinuz-4.2.0-22-generic root=UUID=341b28d7-2939-4b10-afc8-b865fd46eec6 ro rootflags=subvol=@
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-22-generic N/A
   linux-backports-modules-4.2.0-22-generic  N/A
   linux-firmware                            1.149.3
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/25/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3.5
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: H8SGL
  dmi.board.vendor: Supermicro
  dmi.board.version: 1234567890
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 17
  dmi.chassis.vendor: Supermicro
  dmi.chassis.version: 1234567890
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3.5:bd11/25/2013:svnSupermicro:pnH8SGL:pvr1234567890:rvnSupermicro:rnH8SGL:rvr1234567890:cvnSupermicro:ct17:cvr1234567890:
  dmi.product.name: H8SGL
  dmi.product.version: 1234567890
  dmi.sys.vendor: Supermicro

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