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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 1438677

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/1438677

Title:
  dom0 kernel panic - xen_blkbk_unmap+0x5c/0x2f0 [xen_blkback]

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Current stable kernel is affected by an issue that happens when
  releasing grants. It is a communication issue between dom0 and domU
  and there is a temptative patch upstream (konrad's tree) that might
  fix the issue:

  https://git.kernel.org/cgit/linux/kernel/git/konrad/xen.git/patch/?id=c43cf3ea838541ea9f066f4f1aa7b197cba6276e
  (also in attachment)

  I have not been able to backport this patch on top of current
  3.13.0-48 sources.

  When this panic is triggered (on a server for example), there is a
  complete dom0 kernel crash (as documented by attachment log) with data
  & services loss.

  /proc/version_signature: Ubuntu 3.13.0-48.80-generic 3.13.11-ckt16

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