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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Also affects: nova/rocky
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1819764

Title:
  Excessive warnings in nova-compute logs about unexpected network-vif-
  unplugged events during live migration

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) rocky series:
  In Progress
Status in OpenStack Compute (nova) stein series:
  Fix Committed

Bug description:
  Seen here:

  http://logs.openstack.org/63/631363/22/check/nova-grenade-live-
  migration/1a03cbc/logs/subnode-2/screen-n-cpu.txt.gz?level=WARNING

  Mar 11 07:50:38.515198 ubuntu-xenial-ovh-bhs1-0003641906 nova-
  compute[3321]: WARNING nova.compute.manager [req-883bec65-937b-
  4ed6-9d05-f0282ed17b75 req-11ffd59a-bf70-4cec-9678-36d3335ef766
  service nova] [instance: faf3444e-f788-4ff4-992a-b14ce53ef8f8]
  Received unexpected event network-vif-unplugged-85392fed-4d68-4e01
  -818a-e004a33d95b6 for instance with vm_state paused and task_state
  migrating.

  There are 22 instances of that same type of warning in that compute
  log, and it's all over our CI jobs that run live migration tests:

  http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22Received%20unexpected%20event
  %20network-vif-
  unplugged%5C%22%20AND%20message%3A%5C%22and%20task_state%20migrating.%5C%22%20AND%20tags%3A%5C%22screen-n-cpu.txt%5C%22&from=7d

  We don't listen for network-vif-unplugged events during live migration
  and the unplug events are expected so we shouldn't warn about those.

  We see quite a bit of this for other move operations like resize
  revert and shelve offload as well, and hard reboots, but we could deal
  with those separately:

  http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22Received%20unexpected%20event
  %20network-vif-
  unplugged%5C%22%20AND%20NOT%20message%3A%5C%22and%20task_state%20None%5C%22%20AND%20tags%3A%5C%22screen-n-cpu.txt%5C%22&from=7d

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