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[OpenStack Infra <1741667@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/532214
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=af326fd6f64cb331e53e87400330fffe509f0461
Submitter: Zuul
Branch:    master

commit af326fd6f64cb331e53e87400330fffe509f0461
Author: Matt Riedemann <mriedem.os@xxxxxxxxx>
Date:   Tue Jan 9 10:16:21 2018 -0500

    libvirt: don't attempt to live snapshot paused instances
    
    When we changed the default value of the
    workarounds.disable_libvirt_livesnapshot config option value
    to False in 980d0fcd75c2b15ccb0af857a9848031919c6c7d earlier
    in Queens, we were testing against the Pike UCA packages which
    has libvirt 3.6.0 and qemu 2.10. Live snapshots of a paused
    instance work with those package versions as shown by the
    test_create_image_from_paused_server test in Tempest.
    
    However, if you just use the Ubuntu 16.04 packages for libvirt
    (1.3.1) and qemu (2.5), that test fails and the live snapshot hangs
    on the paused instance.
    
    This change adds PAUSED to a list of power states that aren't
    valid for live snapshot. We can eventually remove this when we
    require (or add a conditional check for) libvirt>=3.6.0 and
    qemu>=2.10.
    
    Change-Id: If6c4dd6890ad6e2d00b186c6a9aa85f507b354e0
    Closes-Bug: #1741667


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1741667

Title:
  live snapshot of a paused instance hangs

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  Seeing this on this CI job where the Pike UCA is not enabled so
  libvirt 1.3.1 is being used, and I don't think we really support
  libvirt live snapshot in CI until at least libvirt 3.6.0.

  http://logs.openstack.org/86/531386/5/check/tempest-full/2932954/job-
  output.txt.gz#_2018-01-06_03_19_12_728469

  In this case, the live snapshot on the paused instance just hangs. If
  you trace req-f7805820-c671-487f-8043-a1fe30dd0372 through the n-cpu
  logs you'll see it just hangs:

  http://logs.openstack.org/86/531386/5/check/tempest-
  full/2932954/controller/logs/screen-n-cpu.txt

  Jan 06 02:41:44.636751 ubuntu-xenial-infracloud-vanilla-0001712754
  nova-compute[10798]: WARNING nova.compute.manager [None
  req-f7805820-c671-487f-8043-a1fe30dd0372 tempest-
  ImagesTestJSON-1310987708 tempest-ImagesTestJSON-1310987708]
  [instance: 8c15c0d7-667d-40f8-b2d8-b6adb6a321e7] trying to snapshot a
  non-running instance: (state: 3 expected: 1)

  We should probably not even attempt a live snapshot on a paused
  instance since that doesn't really make sense.

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