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[Elod Illes <1831771@xxxxxxxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1831771

Title:
  UnexpectedDeletingTaskStateError exception can leave traces of VIFs on
  host

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) queens series:
  Fix Committed
Status in OpenStack Compute (nova) rocky series:
  Fix Committed
Status in OpenStack Compute (nova) stein series:
  Fix Released
Status in OpenStack Compute (nova) train series:
  Fix Released

Bug description:
  This was originally reported in Bugzilla

  https://bugzilla.redhat.com/show_bug.cgi?id=1668159

  The 'UnexpectedDeletingTaskStateError' exception can be raised by
  something like aborting a large heat stack, where the instance hasn't
  finished setting up before the stack is aborted and the instances
  deleted.

  https://github.com/openstack/nova/blob/19.0.0/nova/db/sqlalchemy/api.py#L2864

  We handle this in the compute manager and as part of that handling, we
  clean up the resource tracking of network interfaces.

  https://github.com/openstack/nova/blob/19.0.0/nova/compute/manager.py#L2034-L2040

  However, we don't unplug these interfaces. This can result in things
  being left over on the host.

  We should attempt to unplug VIFs as part of this cleanup.

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