>From the log which You sent it seems that neutron server already sent to
nova notification:
2020-12-03 13:13:20.928 21 INFO neutron.notifiers.nova [-] Nova event
response: {'name': 'network-changed', 'server_uuid':
'04b615d1-e911-48f9-bdb1-cf950ec49ef2', 'tag': '1c8b47f1-417f-489c-851c-
6c0324d33530', 'status': 'completed', 'code': 200}
I think You should check check on nova's side where this notification is.
And also, can You check if port for which nova waits is really UP or DOWN just
before nova fails instance?
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https://bugs.launchpad.net/bugs/1906683
Title:
instance fails to start with "Failed to allocate the network(s)"
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