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[Launchpad Bug Tracker <1368724@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:ubuntu/precise-proposed/linux-lts-trusty

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https://bugs.launchpad.net/bugs/1368724

Title:
  Xen guests may hang after migration or suspend/resume

Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Trusty:
  Fix Committed
Status in “linux” source package in Utopic:
  Fix Released

Bug description:
  [Impact]
  Xen guests may hang during resume after a migration or suspend.  The predominately affects HVM guests.

  [Test Case]
  Create a Xen guest and attempt to migrate or save/restore (suspend/resume) hundreds of times.

  [Fix]
  The following upstream commits (tagged for stable) fix the hangs.

  "x86/xen: resume timer irqs early"
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8d5999df35314607c38fbd6bdd709e25c3a4eeab

  and

  "xen/manage: Always freeze/thaw processes when suspend/resuming"
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=61a734d305e16944b42730ef582a7171dc733321

  Both are clean cherry-picks.

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