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[Ubuntu Foundations Team Bug Bot <1438677@xxxxxxxxxxxxxxxxxx>]

** Tags added: patch

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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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