Bug 1930432

This bug was initially created as a copy of Bug #1917675

I am copying this bug because: 



Description of problem:
Nova evacuate fails due to timeout waiting for a network-vif-plugged event for instance

Version-Release number of selected component (if applicable):


How reproducible:
100% evacuation after rebooting the instance

Steps to Reproduce:
1. Stop a compute node:
   $ openstack compute service set --disable --down compute-0 nova-compute
   $ openstack baremetal node power off compute-0
2. Evacuate an instance on the node: nova evacuate <instance-id>
3. The status of the instance changed from ACTIVE to ERROR, finally

Actual results:
The status of the instance changed from ACTIVE to REBUILD, then ERROR

Expected results:
The status of the instance changed from ACTIVE to REBUILD, then ACTIVE

Additional info:
The network is OVS.

Unexpected event network-vif-plugged-<PORT-ID> received before preparing to wait for external event network-vif-plugged-<PORT-ID> like the following.

~~~
...
2021-01-18 18:07:51.043 7 WARNING nova.compute.manager Received unexpected event network-vif-plugged-<PORT-ID> for instance with vm_state active and task_state rebuilding.
...
2021-01-18 18:07:53.841 7 DEBUG nova.compute.manager Preparing to wait for external event network-vif-plugged-<PORT-ID>
...
2021-01-18 18:12:56.131 7 ERROR nova.compute.manager Setting instance vm_state to ERROR
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/nova/virt/libvirt/driver.py", line 6442, in _create_domain_and_network
    network_info)
  File "/usr/lib64/python3.6/contextlib.py", line 88, in __exit__
    next(self.gen)
  File "/usr/lib/python3.6/site-packages/nova/compute/manager.py", line 478, in wait_for_instance_event
    actual_event = event.wait()
  File "/usr/lib/python3.6/site-packages/eventlet/event.py", line 125, in wait
    result = hub.switch()
  File "/usr/lib/python3.6/site-packages/eventlet/hubs/hub.py", line 298, in switch
    return self.greenlet.switch()
eventlet.timeout.Timeout: 300 seconds
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/nova/compute/manager.py", line 8974, in _error_out_instance_on_exception
    yield
  File "/usr/lib/python3.6/site-packages/nova/compute/manager.py", line 3388, in rebuild_instance
    migration, request_spec, allocs)
  File "/usr/lib/python3.6/site-packages/nova/compute/manager.py", line 3450, in _do_rebuild_instance_with_claim
    self._do_rebuild_instance(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/nova/compute/manager.py", line 3610, in _do_rebuild_instance
    self._rebuild_default_impl(**kwargs)
  File "/usr/lib/python3.6/site-packages/nova/compute/manager.py", line 3275, in _rebuild_default_impl
    block_device_info=new_block_device_info)
  File "/usr/lib/python3.6/site-packages/nova/virt/libvirt/driver.py", line 3647, in spawn
    cleanup_instance_disks=created_disks)
  File "/usr/lib/python3.6/site-packages/nova/virt/libvirt/driver.py", line 6465, in _create_domain_and_network
    raise exception.VirtualInterfaceCreateException()
nova.exception.VirtualInterfaceCreateException: Virtual Interface creation failed
...
~~~