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[Bug 2121856] [NEW] scheduler HostManager._init_instance_info runs in parallell on shared self._instance_info data without a lock

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Balazs Gibizer <2121856@xxxxxxxxxxxxxxxxxx>
Date: Tue, 02 Sep 2025 08:46:48 -0000
Reply-to: Bug 2121856 <2121856@xxxxxxxxxxxxxxxxxx>
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Public bug reported:

https://github.com/openstack/nova/blob/539e9711264ccbf6db60c707db0382da72bac8e4/nova/scheduler/host_manager.py#L413C9-L473

This code can be racy in threading mode as it does not have a lock
around modifying self._instance_info while it runs in parallel with the
rest of the scheduler code.

This was a missed spot during nova-scheduler eventlet removal.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2121856

Title:
  scheduler HostManager._init_instance_info runs in parallell on shared
  self._instance_info data without a lock

Status in OpenStack Compute (nova):
  New

Bug description:
  https://github.com/openstack/nova/blob/539e9711264ccbf6db60c707db0382da72bac8e4/nova/scheduler/host_manager.py#L413C9-L473

  This code can be racy in threading mode as it does not have a lock
  around modifying self._instance_info while it runs in parallel with
  the rest of the scheduler code.

  This was a missed spot during nova-scheduler eventlet removal.

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