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[Andrej Rohaŭ <1444070@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1445252 ***
    https://bugs.launchpad.net/bugs/1445252

** This bug has been marked a duplicate of bug 1445252
   [vivid] btrfs deadlock at mount/boot

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https://bugs.launchpad.net/bugs/1444070

Title:
  btrfs-transaction hangs

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After installing Ubuntu 15.04 a few times, I'm always having the same problem, after booting the system several times, it always  hangs at plymouth. Before the problem takes place  I always notice some flickering on the screen after  plymouth The problem persists even with the nomodeset parameter or with recovery mode. I'm using a Acer Asipire V5-552G.
  --- 
  ApportVersion: 2.17.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  dan        1432 F.... pulseaudio
   /dev/snd/controlC0:  dan        1432 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 15.04
  HibernationDevice: RESUME=UUID=6612b8cc-dabb-4a5c-9018-4517e9172bec
  InstallationDate: Installed on 2015-04-16 (1 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Beta amd64 (20150326)
  MachineType: Acer Aspire V5-552G
  Package: linux (not installed)
  ProcFB:
   0 radeondrmfb
   1 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.19.0-14-generic.efi.signed root=UUID=c4aa2016-8e0d-4d69-8acb-1eb9c8aa886c ro rootflags=subvol=@ quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.19.0-14.14-generic 3.19.3
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-14-generic N/A
   linux-backports-modules-3.19.0-14-generic  N/A
   linux-firmware                             1.143
  Tags:  vivid
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  Uname: Linux 3.19.0-14-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 12/23/2013
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: V2.07
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Dazzle_RL
  dmi.board.vendor: Acer
  dmi.board.version: Type2 - A01 Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Chassis Manufacturer
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnInsydeCorp.:bvrV2.07:bd12/23/2013:svnAcer:pnAspireV5-552G:pvrV2.07:rvnAcer:rnDazzle_RL:rvrType2-A01BoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion:
  dmi.product.name: Aspire V5-552G
  dmi.product.version: V2.07
  dmi.sys.vendor: Acer

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