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[OpenStack Infra <1859766@xxxxxxxxxxxxxxxxxx>]

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

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

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https://bugs.launchpad.net/bugs/1859766

Title:
  functional tests intermittently fails with "ReadOnlyFieldError: Cannot
  modify readonly field uuid"

Status in OpenStack Compute (nova):
  Invalid
Status in OpenStack Compute (nova) rocky series:
  Fix Released
Status in OpenStack Compute (nova) stein series:
  Fix Released

Bug description:
  On stable/stain and stable/rocky multiple functional tests fails
  randomly with the following stack trace[1]:

  Traceback (most recent call last):
    File "nova/compute/manager.py", line 2322, in _build_and_run_instance
      with self.rt.instance_claim(context, instance, node, limits):
    File "/home/zuul/src/opendev.org/openstack/nova/.tox/functional/local/lib/python2.7/site-packages/oslo_concurrency/lockutils.py", line 328, in inner
      return f(*args, **kwargs)
    File "nova/compute/resource_tracker.py", line 235, in instance_claim
      self._update(elevated, cn)
    File "nova/compute/resource_tracker.py", line 1034, in _update
      self.old_resources[nodename] = old_compute
    File "/home/zuul/src/opendev.org/openstack/nova/.tox/functional/local/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
      self.force_reraise()
    File "/home/zuul/src/opendev.org/openstack/nova/.tox/functional/local/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
      six.reraise(self.type_, self.value, self.tb)
    File "nova/compute/resource_tracker.py", line 1028, in _update
      compute_node.save()
    File "/home/zuul/src/opendev.org/openstack/nova/.tox/functional/local/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 226, in wrapper
      return fn(self, *args, **kwargs)
    File "nova/objects/compute_node.py", line 341, in save
      self._from_db_object(self._context, self, db_compute)
    File "nova/objects/compute_node.py", line 214, in _from_db_object
      setattr(compute, key, value)
    File "/home/zuul/src/opendev.org/openstack/nova/.tox/functional/local/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 77, in setter
      raise exception.ReadOnlyFieldError(field=name)
  ReadOnlyFieldError: Cannot modify readonly field uuid

  logstash signature:
  http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22ReadOnlyFieldError%3A%20Cannot%20modify%20readonly%20field%20uuid%5C%22

  
  [1] https://storage.bhs.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_234/702181/1/check/nova-tox-functional/2341192/testr_results.html

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