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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Also affects: nova/pike
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1712689

Title:
  shelve offloading an instance always results in an error being logged

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) pike series:
  New

Bug description:
  This is a recent regression:

  https://review.openstack.org/#/c/493834/3/nova/compute/resource_tracker.py

  http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22Failed%20to%20clean%20allocation%20of%20a%20shelve%20offloaded%5C%22%20AND%20tags%3A%5C%22screen-n-cpu.txt%5C%22&from=7d

  http://logs.openstack.org/58/496858/1/check/gate-tempest-dsvm-neutron-
  scenario-multinode-lvm-multibackend-ubuntu-xenial-
  nv/eea4ffd/logs/screen-n-cpu.txt#_Aug_23_21_05_33_438007

  Aug 23 21:05:33.438007 ubuntu-xenial-2-node-rax-iad-10587240 nova-
  compute[10028]: ERROR nova.compute.resource_tracker [None req-
  51d8a00f-35e1-489a-b070-edaad0b4c401 tempest-test_creds-1988617175
  tempest-test_creds-1988617175] [instance:
  1fb82ba9-6157-4c66-84f8-b97ed5a4fd84] Failed to clean allocation of a
  shelve offloaded instance

  This is because the delete_allocation_for_instance method doesn't
  return anything, and "if not None" is always True.

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