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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 
 to identify the commit that introduced the problem.


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

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https://bugs.launchpad.net/bugs/1555828

Title:
  BTRFS Kernel trace - Terrible Write Performance

Status in linux package in Ubuntu:
  Triaged

Bug description:
  I am seeing this several times in the logs. I also installed a
  mainline upstream kernel and it still occurred in 4.5-rc7-wily.

  
  theark kernel: INFO: task btrfs-transacti:518 blocked for more than 120 seconds.
  Mar 10 14:00:44 theark kernel:       Not tainted 4.2.0-27-generic #32-Ubuntu
  Mar 10 14:00:44 theark kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Mar 10 14:00:44 theark kernel: btrfs-transacti D ffff88041f296640     0   518      2 0x00000000
  Mar 10 14:00:44 theark kernel:  ffff8803e0eafdb8 0000000000000046 ffff88040cdaa940 ffff88040c8dee00
  Mar 10 14:00:44 theark kernel:  0000000000000246 ffff8803e0eb0000 ffff880409d44178 ffff88040997f800
  Mar 10 14:00:44 theark kernel:  ffff8803e0eafdf8 ffff880409d441d8 ffff8803e0eafdd8 ffffffff817edc37
  Mar 10 14:00:44 theark kernel: Call Trace:
  Mar 10 14:00:44 theark kernel:  [<ffffffff817edc37>] schedule+0x37/0x80
  Mar 10 14:00:44 theark kernel:  [<ffffffffc0324b43>] btrfs_commit_transaction+0x423/0xb20 [btrfs]
  Mar 10 14:00:44 theark kernel:  [<ffffffff810bd760>] ? wake_atomic_t_function+0x60/0x60
  Mar 10 14:00:44 theark kernel:  [<ffffffffc031fe39>] transaction_kthread+0x229/0x240 [btrfs]
  Mar 10 14:00:44 theark kernel:  [<ffffffffc031fc10>] ? btrfs_cleanup_transaction+0x550/0x550 [btrfs]
  Mar 10 14:00:44 theark kernel:  [<ffffffff8109ae38>] kthread+0xd8/0xf0
  Mar 10 14:00:44 theark kernel:  [<ffffffff8109ad60>] ? kthread_create_on_node+0x1f0/0x1f0
  Mar 10 14:00:44 theark kernel:  [<ffffffff817f209f>] ret_from_fork+0x3f/0x70
  Mar 10 14:00:44 theark kernel:  [<ffffffff8109ad60>] ? kthread_create_on_node+0x1f0/0x1f0

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-27-generic 4.2.0-27.32
  ProcVersionSignature: Ubuntu 4.2.0-27.32-generic 4.2.8-ckt1
  Uname: Linux 4.2.0-27-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/hwC0D3', '/dev/snd/hwC0D2', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D2p', '/dev/snd/pcmC0D1p', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Thu Mar 10 13:59:12 2016
  HibernationDevice: RESUME=/dev/mapper/sda5_crypt
  InstallationDate: Installed on 2015-05-10 (305 days ago)
  InstallationMedia: Ubuntu-Server 15.04 "Vivid Vervet" - Release amd64 (20150422)
  IwConfig:
   p1p1      no wireless extensions.
   
   br0       no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-27-generic.efi.signed root=UUID=51a981ad-aeb0-4bd7-91c6-2d493155c812 ro rootflags=subvol=@ quiet splash vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-27-generic N/A
   linux-backports-modules-4.2.0-27-generic  N/A
   linux-firmware                            1.156
  RfKill:
   
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2015-10-26 (136 days ago)
  dmi.bios.date: 01/06/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F18i
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z77X-D3H
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF18i:bd01/06/2014:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnZ77X-D3H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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