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[OpenStack Infra <1724172@xxxxxxxxxxxxxxxxxx>]

This issue was fixed in the openstack/nova pike-eol  release.

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

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https://bugs.launchpad.net/bugs/1724172

Title:
  Allocation of an evacuated instance is not cleaned on the source host
  if instance is not defined on the hypervisor

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) pike series:
  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 Committed

Bug description:
  Nova does not clean up the allocation of an evacuated instance from
  the recovered source compute host if the instance is not any more
  defined on the hypervisor.

  To reproduce:
  * Boot an instance
  * Kill the compute host the instance is booted on
  * Evacuate the instance
  * Recover the original compute host in a way that clears the instance definition from the hypervisor (e.g. redeploy the compute host).
  * Check the allocations of the instance in placement API. The allocation against the source compute host is not cleaned up.

  The compute manager is supposed to clean up evacuated instances during
  the compute manager init_host method by calling
  _destroy_evacuated_instances. However that function only iterates on
  instances known by the hypervisor [1].

  [1]
  https://github.com/openstack/nova/blob/5e4c98a58f1afeaa903829f5e3f28cd6dc30bf4b/nova/compute/manager.py#L654

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