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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => juno-3

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https://bugs.launchpad.net/bugs/1310817

Title:
  VMware: concurrent access error when deleting snapshot

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  The VMware Minesweeper CI is occasionally seeing an error when
  deleting snapshots. The error is:

  Traceback (most recent call last):
    File "/usr/local/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 133, in _dispatch_and_reply
      incoming.message))
    File "/usr/local/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 176, in _dispatch
      return self._do_dispatch(endpoint, method, ctxt, args)
    File "/usr/local/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 122, in _do_dispatch
      result = getattr(endpoint, method)(ctxt, **new_args)
    File "/opt/stack/nova/nova/exception.py", line 88, in wrapped
      payload)
    File "/opt/stack/nova/nova/openstack/common/excutils.py", line 82, in __exit__
      six.reraise(self.type_, self.value, self.tb)
    File "/opt/stack/nova/nova/exception.py", line 71, in wrapped
      return f(self, context, *args, **kw)
    File "/opt/stack/nova/nova/compute/manager.py", line 280, in decorated_function
      pass
    File "/opt/stack/nova/nova/openstack/common/excutils.py", line 82, in __exit__
      six.reraise(self.type_, self.value, self.tb)
    File "/opt/stack/nova/nova/compute/manager.py", line 266, in decorated_function
      return function(self, context, *args, **kwargs)
    File "/opt/stack/nova/nova/compute/manager.py", line 309, in decorated_function
      e, sys.exc_info())
    File "/opt/stack/nova/nova/openstack/common/excutils.py", line 82, in __exit__
      six.reraise(self.type_, self.value, self.tb)
    File "/opt/stack/nova/nova/compute/manager.py", line 296, in decorated_function
      return function(self, context, *args, **kwargs)
    File "/opt/stack/nova/nova/compute/manager.py", line 2692, in backup_instance
      task_states.IMAGE_BACKUP)
    File "/opt/stack/nova/nova/compute/manager.py", line 2758, in _snapshot_instance
      update_task_state)
    File "/opt/stack/nova/nova/virt/vmwareapi/driver.py", line 645, in snapshot
      _vmops.snapshot(context, instance, name, update_task_state)
    File "/opt/stack/nova/nova/virt/vmwareapi/vmops.py", line 873, in snapshot
      self._delete_vm_snapshot(instance, vm_ref, snapshot)
    File "/opt/stack/nova/nova/virt/vmwareapi/vmops.py", line 780, in _delete_vm_snapshot
      self._session._wait_for_task(delete_snapshot_task)
    File "/opt/stack/nova/nova/virt/vmwareapi/driver.py", line 948, in _wait_for_task
      ret_val = done.wait()
    File "/usr/local/lib/python2.7/dist-packages/eventlet/event.py", line 116, in wait
      return hubs.get_hub().switch()
    File "/usr/local/lib/python2.7/dist-packages/eventlet/hubs/hub.py", line 187, in switch
      return self.greenlet.switch()
  VMwareDriverException: A general system error occurred: concurrent access

  Full logs for an affected run can be found here:
  http://10.148.255.241/logs/85961/2

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