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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

Because of https://review.opendev.org/#/c/605041/ I think we can take
the fix back to stable/rocky.

** Changed in: nova
     Assignee: sean mooney (sean-k-mooney) => Artom Lifshitz (notartom)

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

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

** Changed in: nova/rocky
       Status: New => Confirmed

** Changed in: nova/stein
       Status: New => Confirmed

** Changed in: nova/stein
   Importance: Undecided => Medium

** Changed in: nova/rocky
   Importance: Undecided => Medium

** Tags added: libvirt

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You received this bug notification because you are a member of Yahoo!
Engineering Team, which is subscribed to OpenStack Compute (nova).
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):
  In Progress
Status in OpenStack Compute (nova) rocky series:
  Confirmed
Status in OpenStack Compute (nova) stein series:
  Confirmed

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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