I can't install apport on the original system where this problem was
observed (Precise + LTS kernel) but I have reproduced it on a Raring
install with 3.8.0-31-generic and submitted the apport information from
that environment.

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

Status in “linux” package in Ubuntu:

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.
   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
  Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize 
libusb: -99
  MarkForUpload: True
  Package: linux (not installed)
   PATH=(custom, no user)
  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
   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)

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