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[Launchpad Bug Tracker <1095220@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1095220

Title:
  ext4 file system corruptions due to a kernel bug

Status in linux package in Ubuntu:
  Expired

Bug description:
  A problematic kernel patch has been backported to Ubuntu since linux-image-3.5.0-18-generic:
  * jbd2: don't write superblock when if its empty (LP: #1066176)

  There are a few discussions on this issue:
  http://www.phoronix.com/scan.php?page=news_item&px=MTIxNDQ
  https://bbs.archlinux.org/viewtopic.php?id=151341&p=1
  https://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=8c673cbc7682b3f2862fe42f8069cac20c09e160

  "This could potentially lead to minor file system corruptions (pass 5
  complaints with the inode allocation bitmap) after an unclean shutdown
  under the wrong/unlucky workloads, but it turned into major failure if
  the journal_checksum and/or jouaral_async_commit was enabled."

  Another bug Bug #1019347 causing unclean shutdown makes the scenario
  worse in Ubuntu 12.10. I experienced serious filesystem corruptions
  twice on a newly installed Ubuntu 12.10 system after upgrading to the
  latest 3.5.0-21 kernel, especially when I frequently reboot my
  computer.

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