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[Alberto Salvia Novella <es20490446e@xxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1454903

Title:
  Btrfs Fails to Mount Drive - btrfs-transaction blocked for more than
  120 seconds.

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Call Trace:
  kernel:  ffff880408609800 ffff8803e9cba200 ffff8803d06f7398 ffff8803bc89fe00
  kernel:  0000000000014200 ffff88040ce9f5c0 ffff880407f9d850 ffff8803bc89fdd8
  kernel:  ffff8803bc89fdc8 ffff880407f9d850 0000000000014200 ffff8803bc89ffd8
  kernel: btrfs-transacti D ffff8803bc89fdc8     0  4187      2 0x00000000
  kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  kernel:       Not tainted 3.19.0-16-generic #16-Ubuntu
  kernel: INFO: task btrfs-transacti:4187 blocked for more than 120 seconds.
  kernel:  [<ffffffff817c934d>] system_call_fastpath+0x16/0x1b
  kernel:  [<ffffffff812175db>] SyS_mount+0x8b/0xd0
  kernel:  [<ffffffff812169a4>] do_mount+0x204/0xb20
  kernel:  [<ffffffff81213b4b>] vfs_kern_mount+0x6b/0x120
  kernel:  [<ffffffff8119b805>] ? __alloc_percpu+0x15/0x20
  kernel:  [<ffffffff811f7428>] mount_fs+0x38/0x1c0
  kernel:  [<ffffffffc0333b00>] btrfs_mount+0x850/0x920 [btrfs]
  kernel:  [<ffffffffc035db23>] open_ctree+0x1813/0x2090 [btrfs]
  kernel:  [<ffffffffc039f9c0>] ? replay_one_extent+0x6b0/0x6b0 [btrfs]
  kernel:  [<ffffffffc03a2214>] btrfs_recover_log_trees+0x1d4/0x470 [btrfs]
  kernel:  [<ffffffffc039abbb>] walk_log_tree+0xbb/0x1a0 [btrfs]
  kernel:  [<ffffffffc039a679>] walk_down_log_tree+0x1d9/0x420 [btrfs]
  kernel:  [<ffffffffc0382f34>] ? alloc_extent_buffer+0x34/0x350 [btrfs]
  kernel:  [<ffffffffc039b04e>] insert_orphan_item+0x5e/0x90 [btrfs]

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-16-generic 3.19.0-16.16
  ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
  Uname: Linux 3.19.0-16-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jdfalk     3444 F.... pulseaudio
  Date: Wed May 13 19:03:10 2015
  HibernationDevice: RESUME=/dev/mapper/sda5_crypt
  InstallationDate: Installed on 2015-05-10 (4 days ago)
  InstallationMedia: Ubuntu-Server 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-16-generic.efi.signed root=UUID=51a981ad-aeb0-4bd7-91c6-2d493155c812 ro rootflags=subvol=@ crashkernel=384M-:128M
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-16-generic N/A
   linux-backports-modules-3.19.0-16-generic  N/A
   linux-firmware                             1.143
  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: 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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