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[Bug 1739453] [NEW] MigrationsAdminTest fails with NoValidHost because resource claim swap in placement fails with 500

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Matt Riedemann <mriedem.os@xxxxxxxxx>
Date: Wed, 20 Dec 2017 17:03:12 -0000
Reply-to: Bug 1739453 <1739453@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

http://logs.openstack.org/84/529184/2/check/legacy-tempest-dsvm-
py35/888d647/job-output.txt.gz#_2017-12-20_16_08_20_862659

Fails in conductor here when swapping the resource allocation from the
instance to the migration record:

http://logs.openstack.org/84/529184/2/check/legacy-tempest-dsvm-
py35/888d647/logs/screen-n-super-cond.txt.gz#_Dec_20_15_15_20_744636

Dec 20 15:15:20.744636 ubuntu-xenial-citycloud-lon1-0001533915 nova-conductor[21763]: WARNING nova.scheduler.client.report [None req-bd8ccca7-0a5a-4b8f-a129-bfd147f72fe5 tempest-MigrationsAdminTest-1384405657 tempest-MigrationsAdminTest-1384405657] Unable to submit allocation for instance d44e9a86-5ebd-4229-b516-6428ace9cb09 (500 {"computeFault": {"code": 500, "message": "The server has either erred or is incapable of performing the requested operation."}})
Dec 20 15:15:20.747237 ubuntu-xenial-citycloud-lon1-0001533915 nova-conductor[21763]: ERROR nova.conductor.tasks.migrate [None req-bd8ccca7-0a5a-4b8f-a129-bfd147f72fe5 tempest-MigrationsAdminTest-1384405657 tempest-MigrationsAdminTest-1384405657] [instance: 8befd9e7-4df0-40b6-97a0-1e268e00108f] Unable to replace resource claim on source host ubuntu-xenial-citycloud-lon1-0001533915 node ubuntu-xenial-citycloud-lon1-0001533915 for instance

The failure in the placement logs:

http://logs.openstack.org/84/529184/2/check/legacy-tempest-dsvm-
py35/888d647/logs/screen-placement-api.txt.gz#_Dec_20_15_15_20_666337

Dec 20 15:15:20.726882 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack Traceback (most recent call last):
Dec 20 15:15:20.727033 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/api/openstack/__init__.py", line 82, in __call__
Dec 20 15:15:20.727187 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return req.get_response(self.application)
Dec 20 15:15:20.727332 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/webob/request.py", line 1327, in send
Dec 20 15:15:20.727509 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     application, catch_exc_info=False)
Dec 20 15:15:20.727670 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/webob/request.py", line 1291, in call_application
Dec 20 15:15:20.727830 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     app_iter = application(self.environ, start_response)
Dec 20 15:15:20.727982 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/webob/dec.py", line 131, in __call__
Dec 20 15:15:20.730042 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     resp = self.call_func(req, *args, **self.kwargs)
Dec 20 15:15:20.730225 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/webob/dec.py", line 196, in call_func
Dec 20 15:15:20.730397 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return self.func(req, *args, **kwargs)
Dec 20 15:15:20.730590 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/api/openstack/placement/microversion.py", line 117, in __call__
Dec 20 15:15:20.730783 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     response = req.get_response(self.application)
Dec 20 15:15:20.730957 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/webob/request.py", line 1327, in send
Dec 20 15:15:20.731124 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     application, catch_exc_info=False)
Dec 20 15:15:20.731361 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/webob/request.py", line 1291, in call_application
Dec 20 15:15:20.731508 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     app_iter = application(self.environ, start_response)
Dec 20 15:15:20.731669 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/api/openstack/placement/handler.py", line 220, in __call__
Dec 20 15:15:20.731812 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return dispatch(environ, start_response, self._map)
Dec 20 15:15:20.731952 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/api/openstack/placement/handler.py", line 147, in dispatch
Dec 20 15:15:20.732137 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return handler(environ, start_response)
Dec 20 15:15:20.732295 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/webob/dec.py", line 131, in __call__
Dec 20 15:15:20.732436 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     resp = self.call_func(req, *args, **self.kwargs)
Dec 20 15:15:20.732606 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/api/openstack/placement/wsgi_wrapper.py", line 29, in call_func
Dec 20 15:15:20.732749 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     super(PlacementWsgify, self).call_func(req, *args, **kwargs)
Dec 20 15:15:20.732883 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/webob/dec.py", line 196, in call_func
Dec 20 15:15:20.733016 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return self.func(req, *args, **kwargs)
Dec 20 15:15:20.733170 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/api/openstack/placement/microversion.py", line 257, in decorated_func
Dec 20 15:15:20.733320 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return _find_method(f, version, status_code)(req, *args, **kwargs)
Dec 20 15:15:20.733480 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/api/openstack/placement/util.py", line 167, in decorated_function
Dec 20 15:15:20.733638 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return f(req)
Dec 20 15:15:20.733782 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/api/openstack/placement/handlers/allocation.py", line 424, in set_allocations_for_consumer
Dec 20 15:15:20.733929 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return _set_allocations_for_consumer(req, ALLOCATION_SCHEMA_V1_8)
Dec 20 15:15:20.734070 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/api/openstack/placement/handlers/allocation.py", line 390, in _set_allocations_for_consumer
Dec 20 15:15:20.734210 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     allocations.create_all()
Dec 20 15:15:20.734351 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/objects/resource_provider.py", line 2148, in create_all
Dec 20 15:15:20.734498 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     self._set_allocations(self._context, self.objects)
Dec 20 15:15:20.734666 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/oslo_db/api.py", line 147, in wrapper
Dec 20 15:15:20.734815 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     ectxt.value = e.inner_exc
Dec 20 15:15:20.734956 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
Dec 20 15:15:20.735105 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     self.force_reraise()
Dec 20 15:15:20.735247 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
Dec 20 15:15:20.735387 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     six.reraise(self.type_, self.value, self.tb)
Dec 20 15:15:20.735527 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/six.py", line 693, in reraise
Dec 20 15:15:20.735684 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     raise value
Dec 20 15:15:20.735858 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/oslo_db/api.py", line 135, in wrapper
Dec 20 15:15:20.736006 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return f(*args, **kwargs)
Dec 20 15:15:20.736174 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/oslo_db/sqlalchemy/enginefacade.py", line 984, in wrapper
Dec 20 15:15:20.736324 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return fn(*args, **kwargs)
Dec 20 15:15:20.736480 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/objects/resource_provider.py", line 2029, in _set_allocations
Dec 20 15:15:20.736665 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     reason='already created')
Dec 20 15:15:20.736805 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack nova.exception.ObjectActionError: Object action create failed because: already created
Dec 20 15:15:20.736955 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack 

Looks like we're racing to create allocations and they are already
created somehow.

** Affects: nova
     Importance: High
         Status: Confirmed


** Tags: placement

** Changed in: nova
       Status: New => Confirmed

** Changed in: nova
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1739453

Title:
  MigrationsAdminTest fails with NoValidHost because resource claim swap
  in placement fails with 500

Status in OpenStack Compute (nova):
  Confirmed

Bug description:
  http://logs.openstack.org/84/529184/2/check/legacy-tempest-dsvm-
  py35/888d647/job-output.txt.gz#_2017-12-20_16_08_20_862659

  Fails in conductor here when swapping the resource allocation from the
  instance to the migration record:

  http://logs.openstack.org/84/529184/2/check/legacy-tempest-dsvm-
  py35/888d647/logs/screen-n-super-cond.txt.gz#_Dec_20_15_15_20_744636

  Dec 20 15:15:20.744636 ubuntu-xenial-citycloud-lon1-0001533915 nova-conductor[21763]: WARNING nova.scheduler.client.report [None req-bd8ccca7-0a5a-4b8f-a129-bfd147f72fe5 tempest-MigrationsAdminTest-1384405657 tempest-MigrationsAdminTest-1384405657] Unable to submit allocation for instance d44e9a86-5ebd-4229-b516-6428ace9cb09 (500 {"computeFault": {"code": 500, "message": "The server has either erred or is incapable of performing the requested operation."}})
  Dec 20 15:15:20.747237 ubuntu-xenial-citycloud-lon1-0001533915 nova-conductor[21763]: ERROR nova.conductor.tasks.migrate [None req-bd8ccca7-0a5a-4b8f-a129-bfd147f72fe5 tempest-MigrationsAdminTest-1384405657 tempest-MigrationsAdminTest-1384405657] [instance: 8befd9e7-4df0-40b6-97a0-1e268e00108f] Unable to replace resource claim on source host ubuntu-xenial-citycloud-lon1-0001533915 node ubuntu-xenial-citycloud-lon1-0001533915 for instance

  The failure in the placement logs:

  http://logs.openstack.org/84/529184/2/check/legacy-tempest-dsvm-
  py35/888d647/logs/screen-placement-api.txt.gz#_Dec_20_15_15_20_666337

  Dec 20 15:15:20.726882 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack Traceback (most recent call last):
  Dec 20 15:15:20.727033 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/api/openstack/__init__.py", line 82, in __call__
  Dec 20 15:15:20.727187 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return req.get_response(self.application)
  Dec 20 15:15:20.727332 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/webob/request.py", line 1327, in send
  Dec 20 15:15:20.727509 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     application, catch_exc_info=False)
  Dec 20 15:15:20.727670 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/webob/request.py", line 1291, in call_application
  Dec 20 15:15:20.727830 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     app_iter = application(self.environ, start_response)
  Dec 20 15:15:20.727982 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/webob/dec.py", line 131, in __call__
  Dec 20 15:15:20.730042 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     resp = self.call_func(req, *args, **self.kwargs)
  Dec 20 15:15:20.730225 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/webob/dec.py", line 196, in call_func
  Dec 20 15:15:20.730397 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return self.func(req, *args, **kwargs)
  Dec 20 15:15:20.730590 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/api/openstack/placement/microversion.py", line 117, in __call__
  Dec 20 15:15:20.730783 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     response = req.get_response(self.application)
  Dec 20 15:15:20.730957 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/webob/request.py", line 1327, in send
  Dec 20 15:15:20.731124 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     application, catch_exc_info=False)
  Dec 20 15:15:20.731361 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/webob/request.py", line 1291, in call_application
  Dec 20 15:15:20.731508 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     app_iter = application(self.environ, start_response)
  Dec 20 15:15:20.731669 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/api/openstack/placement/handler.py", line 220, in __call__
  Dec 20 15:15:20.731812 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return dispatch(environ, start_response, self._map)
  Dec 20 15:15:20.731952 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/api/openstack/placement/handler.py", line 147, in dispatch
  Dec 20 15:15:20.732137 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return handler(environ, start_response)
  Dec 20 15:15:20.732295 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/webob/dec.py", line 131, in __call__
  Dec 20 15:15:20.732436 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     resp = self.call_func(req, *args, **self.kwargs)
  Dec 20 15:15:20.732606 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/api/openstack/placement/wsgi_wrapper.py", line 29, in call_func
  Dec 20 15:15:20.732749 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     super(PlacementWsgify, self).call_func(req, *args, **kwargs)
  Dec 20 15:15:20.732883 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/webob/dec.py", line 196, in call_func
  Dec 20 15:15:20.733016 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return self.func(req, *args, **kwargs)
  Dec 20 15:15:20.733170 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/api/openstack/placement/microversion.py", line 257, in decorated_func
  Dec 20 15:15:20.733320 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return _find_method(f, version, status_code)(req, *args, **kwargs)
  Dec 20 15:15:20.733480 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/api/openstack/placement/util.py", line 167, in decorated_function
  Dec 20 15:15:20.733638 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return f(req)
  Dec 20 15:15:20.733782 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/api/openstack/placement/handlers/allocation.py", line 424, in set_allocations_for_consumer
  Dec 20 15:15:20.733929 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return _set_allocations_for_consumer(req, ALLOCATION_SCHEMA_V1_8)
  Dec 20 15:15:20.734070 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/api/openstack/placement/handlers/allocation.py", line 390, in _set_allocations_for_consumer
  Dec 20 15:15:20.734210 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     allocations.create_all()
  Dec 20 15:15:20.734351 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/objects/resource_provider.py", line 2148, in create_all
  Dec 20 15:15:20.734498 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     self._set_allocations(self._context, self.objects)
  Dec 20 15:15:20.734666 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/oslo_db/api.py", line 147, in wrapper
  Dec 20 15:15:20.734815 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     ectxt.value = e.inner_exc
  Dec 20 15:15:20.734956 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
  Dec 20 15:15:20.735105 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     self.force_reraise()
  Dec 20 15:15:20.735247 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
  Dec 20 15:15:20.735387 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     six.reraise(self.type_, self.value, self.tb)
  Dec 20 15:15:20.735527 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/six.py", line 693, in reraise
  Dec 20 15:15:20.735684 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     raise value
  Dec 20 15:15:20.735858 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/oslo_db/api.py", line 135, in wrapper
  Dec 20 15:15:20.736006 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return f(*args, **kwargs)
  Dec 20 15:15:20.736174 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/usr/local/lib/python3.5/dist-packages/oslo_db/sqlalchemy/enginefacade.py", line 984, in wrapper
  Dec 20 15:15:20.736324 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     return fn(*args, **kwargs)
  Dec 20 15:15:20.736480 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack   File "/opt/stack/new/nova/nova/objects/resource_provider.py", line 2029, in _set_allocations
  Dec 20 15:15:20.736665 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack     reason='already created')
  Dec 20 15:15:20.736805 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack nova.exception.ObjectActionError: Object action create failed because: already created
  Dec 20 15:15:20.736955 ubuntu-xenial-citycloud-lon1-0001533915 devstack@placement-api.service[15195]: ERROR nova.api.openstack 

  Looks like we're racing to create allocations and they are already
  created somehow.

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Follow ups

[Bug 1739453] Re: MigrationsAdminTest fails with NoValidHost because resource claim swap in placement fails with 500
From: Matt Riedemann, 2018-01-02
[Bug 1739453] Re: MigrationsAdminTest fails with NoValidHost because resource claim swap in placement fails with 500
From: OpenStack Infra, 2017-12-27