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[Felipe Alencastro <1944779@xxxxxxxxxxxxxxxxxx>]

Just had this same issue on charmed Xena, and managed to workaround it
by following Tolga Kaprol's suggestion at
https://discourse.charmhub.io/t/community-opinion-on-reliability-and-
success-rate-of-ussuri-deployments/3510/3

** Also affects: charm-neutron-api
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1944779

Title:
  VirtualInterfaceCreateException due to "Timeout waiting for
  [('network-vif-plugged'..."

Status in OpenStack Neutron API Charm:
  New
Status in neutron:
  New
Status in OpenStack Compute (nova):
  Confirmed

Bug description:
  Seeing this occasionally in the gate recently, instance spawn fails
  with VirtualInterfaceCreateException after timing out 300 seconds
  waiting for the 'network-vif-plugged' event from neutron. The event
  never arrives (before or after we begin waiting).

  Here's log excerpts showing how it looks [1]:

  Sep 23 06:10:44.144477 ubuntu-focal-rax-iad-0026631025 nova-
  compute[110797]: DEBUG nova.compute.manager [None
  req-6d0b7dcf-7f96-47d2-8673-626abdd275b7 tempest-
  TestSnapshotPattern-20482801 tempest-
  TestSnapshotPattern-20482801-project] [instance:
  487a3a37-fe41-447d-bc77-9ab3fce47473] Preparing to wait for external
  event network-vif-plugged-9129f5b9-2940-44c2-8d44-04c46df5fe49
  {{(pid=110797) prepare_for_instance_event
  /opt/stack/nova/nova/compute/manager.py:280}}

  [...]

  Sep 23 06:15:44.961239 ubuntu-focal-rax-iad-0026631025 nova-
  compute[110797]: WARNING nova.virt.libvirt.driver [None
  req-6d0b7dcf-7f96-47d2-8673-626abdd275b7 tempest-
  TestSnapshotPattern-20482801 tempest-
  TestSnapshotPattern-20482801-project] [instance:
  487a3a37-fe41-447d-bc77-9ab3fce47473] Timeout waiting for [('network-
  vif-plugged', '9129f5b9-2940-44c2-8d44-04c46df5fe49')] for instance
  with vm_state building and task_state spawning:
  eventlet.timeout.Timeout: 300 seconds

  
  Logstash query:

  http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22Instance%20failed%20to%20spawn%3A%20nova.exception.VirtualInterfaceCreateException%3A%20Virtual%20Interface%20creation%20failed%5C%22%20AND%20tags%3A%5C%22screen-
  n-cpu.txt%5C%22&from=7d

  [1] https://paste.opendev.org/show/809546

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