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

[Victor Tapia]

Hi Christian,

Sorry for the lack of updates, I've been trying to reproduce this
behavior using Linux guests and it seems that those VMs work perfectly.
I'm currently checking the virtio balloon driver for Windows, as it
might be the real culprit of the VM crash.

I'll update the case with my findings, thanks!

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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:
  Incomplete
Status in qemu source package in Xenial:
  Incomplete

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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