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[Bug 2125052] [NEW] ImageProps weigher returns an exception after starting a second instance

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Sylvain Bauza <2125052@xxxxxxxxxxxxxxxxxx>
Date: Thu, 18 Sep 2025 09:53:44 -0000
Reply-to: Bug 2125052 <2125052@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx
Public bug reported:

When starting a first instance on a host, the ImageProps weigher works
correctly, but when scheduling a second instance on it, then it returns
an exception due to a missing context :

2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server [None req-d611c529-7c8b-48f5-8465-5fe61d98eac4 ccdbae8178a34f08935c74eca6d6f29c fb742349a3944923b9232fdc303a7a8b - - default default] Exception during message handling: AttributeError: 'NoneType' object has no attribute 'is_admin'
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/oslo_messaging/rpc/server.py", line 165, in _process_incoming
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     res = self.dispatcher.dispatch(message)
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/oslo_messaging/rpc/dispatcher.py", line 309, in dispatch
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     return self._do_dispatch(endpoint, method, ctxt, args)
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/oslo_messaging/rpc/dispatcher.py", line 229, in _do_dispatch
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     result = func(ctxt, **new_args)
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/oslo_messaging/rpc/server.py", line 244, in inner
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     return func(*args, **kwargs)
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/scheduler/manager.py", line 224, in select_destinations
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     selections = self._select_destinations(
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/scheduler/manager.py", line 251, in _select_destinations
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     selections = self._schedule(
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/scheduler/manager.py", line 388, in _schedule
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     hosts = self._get_sorted_hosts(spec_obj, hosts, num)
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/scheduler/manager.py", line 680, in _get_sorted_hosts
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     weighed_hosts = self.host_manager.get_weighed_hosts(
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/scheduler/host_manager.py", line 622, in get_weighed_hosts
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     return self.weight_handler.get_weighed_objects(self.weighers,
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/weights.py", line 134, in get_weighed_objects
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     weights = weigher.weigh_objects(weighed_objs, weighing_properties)
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/weights.py", line 110, in weigh_objects
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     weight = self._weigh_object(obj.obj, weight_properties)
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/scheduler/weights/image_props.py", line 74, in _weigh_object
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     insts.fill_metadata()
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/objects/instance.py", line 1542, in fill_metadata
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     updates = db.instances_fill_metadata(
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/db/utils.py", line 34, in wrapper
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     nova.context.require_context(args[0])
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/context.py", line 296, in require_context
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     if not ctxt.is_admin and not is_user_context(ctxt):
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server AttributeError: 'NoneType' object has no attribute 'is_admin'
2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server ^[[00m

** Affects: nova
     Importance: Undecided
         Status: New

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Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/2125052

Title:
  ImageProps weigher returns an exception after starting a second
  instance

Status in OpenStack Compute (nova):
  New

Bug description:
  When starting a first instance on a host, the ImageProps weigher works
  correctly, but when scheduling a second instance on it, then it
  returns an exception due to a missing context :

  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server [None req-d611c529-7c8b-48f5-8465-5fe61d98eac4 ccdbae8178a34f08935c74eca6d6f29c fb742349a3944923b9232fdc303a7a8b - - default default] Exception during message handling: AttributeError: 'NoneType' object has no attribute 'is_admin'
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/oslo_messaging/rpc/server.py", line 165, in _process_incoming
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     res = self.dispatcher.dispatch(message)
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/oslo_messaging/rpc/dispatcher.py", line 309, in dispatch
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     return self._do_dispatch(endpoint, method, ctxt, args)
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/oslo_messaging/rpc/dispatcher.py", line 229, in _do_dispatch
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     result = func(ctxt, **new_args)
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/oslo_messaging/rpc/server.py", line 244, in inner
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     return func(*args, **kwargs)
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/scheduler/manager.py", line 224, in select_destinations
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     selections = self._select_destinations(
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/scheduler/manager.py", line 251, in _select_destinations
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     selections = self._schedule(
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/scheduler/manager.py", line 388, in _schedule
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     hosts = self._get_sorted_hosts(spec_obj, hosts, num)
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/scheduler/manager.py", line 680, in _get_sorted_hosts
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     weighed_hosts = self.host_manager.get_weighed_hosts(
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/scheduler/host_manager.py", line 622, in get_weighed_hosts
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     return self.weight_handler.get_weighed_objects(self.weighers,
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/weights.py", line 134, in get_weighed_objects
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     weights = weigher.weigh_objects(weighed_objs, weighing_properties)
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/weights.py", line 110, in weigh_objects
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     weight = self._weigh_object(obj.obj, weight_properties)
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/scheduler/weights/image_props.py", line 74, in _weigh_object
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     insts.fill_metadata()
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/objects/instance.py", line 1542, in fill_metadata
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     updates = db.instances_fill_metadata(
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/db/utils.py", line 34, in wrapper
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     nova.context.require_context(args[0])
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.9/site-packages/nova/context.py", line 296, in require_context
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server     if not ctxt.is_admin and not is_user_context(ctxt):
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server AttributeError: 'NoneType' object has no attribute 'is_admin'
  2025-09-17 18:07:47.899 1 ERROR oslo_messaging.rpc.server ^[[00m

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