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[Eugene <1324953@xxxxxxxxxxxxxxxxxx>]

I've just tried defragging a file again with the official trusty kernel
and it soon hanged as before. Rebooting into your kernel fixed it, so
looks like you've done a good job!

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https://bugs.launchpad.net/bugs/1324953

Title:
  btrfs causes kernel crash when defragmenting large file

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Mainline kernel 3.14.1 (linux-
  image-3.14.1-031401-generic_3.14.1-031401.201404141220_i386.deb)
  didn't hit this. I think it's probably because my current kernel
  (3.13.0-27-generic) doesn't include the following patch:

  http://kernel.opensuse.org/cgit/kernel-
  source/diff/patches.suse/btrfs-8196-fix-defrag-32-bit-integer-
  overflow.patch?id=41d5394cbdfc73743e272f6088ce0464f41296e9

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-27-generic 3.13.0-27.50
  ProcVersionSignature: Ubuntu 3.13.0-27.50-generic 3.13.11
  Uname: Linux 3.13.0-27-generic i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.13.0-27-generic.
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: i386
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D1c', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
  Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
  Date: Fri May 30 23:28:48 2014
  HibernationDevice: RESUME=UUID=f9533682-4077-4a9f-930b-135bdf9b2982
  IwConfig:
   lo        no wireless extensions.
   
   eth0      no wireless extensions.
  Lsusb:
   Bus 001 Device 003: ID 174c:1053 ASMedia Technology Inc. 
   Bus 001 Device 004: ID 174c:5106 ASMedia Technology Inc. Transcend StoreJet 25M3
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 002: ID 80ee:0021 VirtualBox USB Tablet
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: innotek GmbH VirtualBox
  ProcEnviron:
   LANGUAGE=en_AU:en
   TERM=linux
   PATH=(custom, no user)
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-27-generic root=UUID=fc30b011-6645-42bb-aa08-034f6e9583fa ro splash quiet vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-27-generic N/A
   linux-backports-modules-3.13.0-27-generic  N/A
   linux-firmware                             1.127.2
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.board.name: VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
  dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH

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