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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

Public bug reported:

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.

** Affects: nova
     Importance: Medium
         Status: Confirmed


** Tags: libvirt snapshot

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

Title:
  live snapshot of a paused instance hangs

Status in OpenStack Compute (nova):
  Confirmed

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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