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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1523491

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

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

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https://bugs.launchpad.net/bugs/1523491

Title:
  kernel stuck in dm_destroy

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  The problem is incorrect backporting of [1] to the Ubuntu Trusty
  kernel [2].

  While original patch moves `dm_get_live_table` to the appropriate
  section mutex lock the backported code just adds another call to it
  under the mutex leaving the original call under spinlock in place.

  [1] https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2a708cff93f1845b9239bc7d6310aef54e716c6a
  [2] http://kernel.ubuntu.com/git/ubuntu/ubuntu-trusty.git/commit/?id=340f3e9970d6251a549d0c8cf90179b190f15def

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