[Bug 1706058] Re: Windows VM crashes when restoring from file if balloon stats polling is enabled

[ChristianEhrhardt]

** Also affects: qemu (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: qemu (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1706058

Title:
  Windows VM crashes when restoring from file if balloon stats polling
  is enabled

Status in Ubuntu Cloud Archive:
  Fix Released
Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Trusty:
  New
Status in qemu source package in Xenial:
  New

Bug description:
  [Impact]

   * Windows VMs BSOD when restoring from QEMUfile or during live migration if the virtio balloon stats polling is enabled.
   * Affected version: 1:2.5+dfsg-5ubuntu10.14 (xenial)

  [Test Case]

   * Install a Windows VM with virtio balloon drivers
   * Start the VM and enable stats polling [1]
   * Save the VM to savefile [2]
   * Restore the VM [3]
   * Enable stats polling [1] and VM will BSOD

  QMP examples:
   [1] {"execute":"qom-set","arguments":{"path":"//machine/i440fx/pci.0/child[7]","property":"guest-stats-polling-interval","value":10}}
   [2] {"execute": "migrate", "arguments": {"uri":"exec:gzip -c > /storage/cases/VM/savefiles/testVM3save.gz"}}
   [3] {"execute":"migrate-incoming","arguments":{"uri":"exec:gzip -c -d /storage/cases/VM/savefiles/testVM3save.gz"}}

  [Other Info]

   * This has been fixed upstream with commit 4a1e48becab81020adfb74b22c76a595f2d02a01
  * Related bug: https://bugzilla.redhat.com/show_bug.cgi?id=1373600

  [Regression Potential]

   *

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