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[Launchpad Bug Tracker <1368724@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.16.0-16.22

---------------
linux (3.16.0-16.22) utopic; urgency=low

  [ Andy Whitcroft ]

  * Revert "SAUCE: x86/xen: Fix setup of 64bit kernel pagetables"
  * [Config] tools -- only build common tools when enabled
  * [Config] follow rename of DEB_BUILD_PROFILES

  [ Tim Gardner ]

  * [Debian] set do_*_tools after stage1 or bootstrap is determined
    - LP: #1370211
  * Release Tracking Bug
    - LP: #1370535

  [ Upstream Kernel Changes ]

  * x86/xen: don't copy bogus duplicate entries into kernel page tables
  * blk-merge: fix blk_recount_segments
    - LP: #1359146
  * igb: bring link up when PHY is powered up
    - LP: #1370018
  * igb: remove unnecessary break after goto
    - LP: #1370018
  * igb: remove unnecessary break after return
    - LP: #1370018
  * igb: Add message when malformed packets detected by hw
    - LP: #1370018
  * igb: bump igb version to 5.2.13
    - LP: #1370018
 -- Tim Gardner <tim.gardner@xxxxxxxxxxxxx>   Tue, 16 Sep 2014 10:19:04 -0600

** Changed in: linux (Ubuntu Utopic)
       Status: Fix Committed => Fix Released

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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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