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[Kairat Kushaev <kkushaev@xxxxxxxxxxxx>]

** Also affects: heat
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1303802

Title:
  qemu image convert fails in snapshot

Status in Orchestration API (Heat):
  New
Status in OpenStack Compute (Nova):
  New

Bug description:
  Periodically in the gate we see a failure by qemu image convert in
  snapshot:

  2014-04-07 01:31:29.470 29554 TRACE oslo.messaging.rpc.dispatcher   File "/opt/stack/new/nova/nova/openstack/common/processutils.py", line 193, in execute
  2014-04-07 01:31:29.470 29554 TRACE oslo.messaging.rpc.dispatcher     cmd=' '.join(cmd))
  2014-04-07 01:31:29.470 29554 TRACE oslo.messaging.rpc.dispatcher ProcessExecutionError: Unexpected error while running command.
  2014-04-07 01:31:29.470 29554 TRACE oslo.messaging.rpc.dispatcher Command: qemu-img convert -f qcow2 -O qcow2 /opt/stack/data/nova/instances/4ff6dc10-eac8-41d2-a645-3a0e0ba07c8a/disk /opt/stack/data/nova/instances/snapshots/tmpcVpCxJ/33eb0bb2b49648c69770b47db3211a86
  2014-04-07 01:31:29.470 29554 TRACE oslo.messaging.rpc.dispatcher Exit code: 1
  2014-04-07 01:31:29.470 29554 TRACE oslo.messaging.rpc.dispatcher Stdout: ''
  2014-04-07 01:31:29.470 29554 TRACE oslo.messaging.rpc.dispatcher Stderr: 'qemu-img: error while reading sector 0: Input/output error\n'

  qemu-img is very obtuse on what the actual issue is, so it's unclear
  if this is a corrupt disk, or a totally missing disk.

  The user visible face of this is on operations like shelve where the
  instance will believe that it's still in active state -
  http://logs.openstack.org/02/85602/1/gate/gate-tempest-dsvm-
  full/20ed964/console.html#_2014-04-07_01_44_29_309

  Even though everything is broken instead.

  Logstash query:
  http://logstash.openstack.org/#eyJzZWFyY2giOiJcInFlbXUtaW1nOiBlcnJvclwiIiwiZmllbGRzIjpbXSwib2Zmc2V0IjowLCJ0aW1lZnJhbWUiOiI2MDQ4MDAiLCJncmFwaG1vZGUiOiJjb3VudCIsInRpbWUiOnsidXNlcl9pbnRlcnZhbCI6MH0sInN0YW1wIjoxMzk2ODc2MTQ4NDc3fQ==

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