Unable to create a VM: local variable 'sibling_set' referenced before assignment

Solution In Progress - Updated -

Issue

When trying to start a virtual machine, the virtual machine does not start. The following error is reported in the nova's log by nova.scheduler.utils :

UnboundLocalError: local variable 'sibling_set' referenced before assignment

Environment

  • Red Hat OpenStack Platform 10.
  • Cpu pinning is used.

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