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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Did you perform a backport of commit
7b2b160da7661bb2ade3f924b1bd3e3084e53341 ( Upstream commit:
b7649158a0d241f8d53d13ff7441858539e16656)?

It seems upstream commit  b764915 was cc'd to stable, but was dropped
from all but the 3.10 stable tree due to the complexity of the backport.

** Tags added: kernel-da-key

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https://bugs.launchpad.net/bugs/1234662

Title:
  Ubuntu-lts-3.8.0 kernels corrupt ext[234] filesystems with 1k block
  size in Xen guests

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  We observed a problem with a Postfix database file created by postmap becoming corrupted in a Xen guest when the file was on an ext4 filesystem with a 1kb block size.  This was reported to the linux-ext4 list in http://marc.info/?t=138018028300003&r=1&w=2.  The subsequent investigation identified the git commit 7b2b160da7661bb2ade3f924b1bd3e3084e53341 as solving the problem.  We have applied this on top of tag Ubuntu-lts-3.8.0-13.22 and confirmed that it resolves the problem we are seeing.
  --- 
  AlsaDevices:
   total 0
   crw-rw---T 1 root audio 116,  1 Oct  4 19:28 seq
   crw-rw---T 1 root audio 116, 33 Oct  4 19:28 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory
  DistroRelease: Ubuntu 13.04
  HibernationDevice: RESUME=UUID=1d79e306-bed4-4cd4-8dbc-24a727ef8db6
  IwConfig: Error: [Errno 2] No such file or directory
  Lspci:
   
  Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
  MarkForUpload: True
  Package: linux (not installed)
  PciMultimedia:
   
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=screen
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 xen
  ProcKernelCmdLine: root=/dev/mapper/ejbca0_systemvg-rootlv ro rootflags=subvol=@   splash quiet tmem $vt_handoff
  ProcVersionSignature: Ubuntu 3.8.0-31.46-generic 3.8.13.8
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-31-generic N/A
   linux-backports-modules-3.8.0-31-generic  N/A
   linux-firmware                            1.106
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  raring
  Uname: Linux 3.8.0-31-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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