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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

I'm going to mark this as not fixed yet because it introduced a
regression for same host resize + revert and the fix is being reverted
on master since it broke neutron's CI jobs:

https://review.opendev.org/#/c/667035/

** Changed in: nova
       Status: Fix Released => Triaged

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https://bugs.launchpad.net/bugs/1832028

Title:
  revert resize: vif-plugged external event sent too soon if Neutron is
  using OVS hybrid plug

Status in OpenStack Compute (nova):
  Triaged
Status in OpenStack Compute (nova) rocky series:
  In Progress
Status in OpenStack Compute (nova) stein series:
  In Progress

Bug description:
  Description
  ===========

  This is all only when Neutron is using OVS with hybrid plugging.

  When reverting a resized instance back to its original source host,
  Nova will timeout waiting for the vif-plugged external event, and
  never finish the revert. This happens because the event is sent by
  Neutron as soon as Nova updates the port binding to point back to the
  original source. This happens before the virt driver gets ready to
  listen for external events, so the event arrives, just too soon, and
  Nova times out.

  Steps to reproduce
  ==================

  1. Resize an instance
  2. When it's in VERIFY_RESIZE, revert it

  Expected result
  ===============

  Instance reverts correctly.

  Actual result
  =============

  Instance goes to ERROR.

  Environment
  ===========

  OVS with hybrid plug. Reported in OSP14/Rocky [1], reproduced on
  master [2] [3].

  [1] https://bugzilla.redhat.com/show_bug.cgi?id=1678681
  [2] https://review.opendev.org/#/c/660782/
  [3] https://review.opendev.org/#/c/653498/

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