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["Joshua R. Poulson" <jopoulso@xxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1445195 ***
    https://bugs.launchpad.net/bugs/1445195

To fix this problem, you will also need
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1454758

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https://bugs.launchpad.net/bugs/1456985

Title:
  Filesystem goes read-only while creating backups on HyperV

Status in linux package in Ubuntu:
  Fix Committed

Bug description:
  Because "ubuntu-bug linux" not works because I am on kernel 3.19.0-17,
  I create this report manually.

  Summary of problem: we create backups with HyperV of 4 linux virtual
  machines. There is 1 CentOS machine (XFS) and 3 Ubuntu 14.04 machines
  (EXT4). Problems occur on the Ubuntu machine only and have occurred on
  multiple hypervisors (physical machines). During the start or at the
  end of the creation of a snapshot, the filesystem switches to read-
  only mode. This happens at completely random moments: at least we are
  not able to detect a pattern. What we find weird is that the CentOS
  machine with XFS is not having any problems.

  What actions did we undertake to get rid of problem? We tried multiple
  backup strategies with HyperV, including snapshots and exports. When
  this was not successful, we were adviced by the #ubuntu-kernel chat
  channel to upgrade our kernel to 3.19.0-17 (coming from 3.13.0-52).
  The reasons that this could solve the problem is that hyperv backups
  require freeze and thaw methods (https://msdn.microsoft.com/en-
  us/library/aa384589%28v=vs.85%29.aspx). Unfortunately the problem did
  not go away.

  The message we get from dmesg when the filesystem goes read-only is as
  follows on the 3.19.0-17 kernel:

  [85630.239889] blk_update_request: I/O error, dev sda, sector 201697672
  [85630.239931] Aborting journal on device sda1-8.
  [85630.253386] EXT4-fs error (device sda1): ext4_journal_check_start:56: Detected aborted journal
  [85630.253428] EXT4-fs (sda1): Remounting filesystem read-only

  While it was as follows on the 3.13.0-52 kernel (different machine):

  [66392.076569] end_request: I/O error, dev sda, sector 65127256
  [66392.076610] Aborting journal on device sda5-8.
  [66392.280052] EXT4-fs error (device sda5): ext4_journal_check_start:56: Detected aborted journal
  [66392.280090] EXT4-fs (sda5): Remounting filesystem read-only
  [66392.482903] EXT4-fs error (device sda5): ext4_journal_check_start:56: Detected aborted journal

  System details:
  - Version signature: Ubuntu 3.19.0-17.17~14.04.1-generic 3.19.6
  - lspci.log: http://paste.ubuntu.com/11242312/
  - boot.log: http://paste.ubuntu.com/11242303/

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