[Bug 1994002] Re: [SRU] migration was active, but no RAM info was set

[Brett Milford]

** Patch added: "lp1994002-qemu-kinetic.debdiff"
   https://bugs.launchpad.net/cloud-archive/+bug/1994002/+attachment/5633118/+files/lp1994002-qemu-kinetic.debdiff

-- 
You received this bug notification because you are a member of Ubuntu
OpenStack, which is subscribed to Ubuntu Cloud Archive.
https://bugs.launchpad.net/bugs/1994002

Title:
  [SRU] migration was active, but no RAM info was set

Status in Ubuntu Cloud Archive:
  New
Status in Ubuntu Cloud Archive ussuri series:
  New
Status in qemu package in Ubuntu:
  Incomplete
Status in qemu source package in Focal:
  New
Status in qemu source package in Jammy:
  New
Status in qemu source package in Kinetic:
  New

Bug description:
  [Impact]

   * While live-migrating many instances concurrently, libvirt sometimes
  return `internal error: migration was active, but no RAM info was
  set:`

   * Effects of this bug are mostly observed in large scale clusters
  with a lot of live migration activity.

   * Has second order effects for consumers of migration monitor such as
  libvirt and openstack.

  [Test Case]
  Steps to Reproduce:
  1. live evacuate a compute
  2. live migration of one or more instances fails with the above error

  N.B Due to the nature of this bug it is difficult consistently
  reproduce.

  [Where problems could occur]
   * In the event of a regression the migration monitor may report an inconsistent state.

  [Original Bug Description]

  While live-migrating many instances concurrently, libvirt sometimes return internal error: migration was active, but no RAM info was set:
  ~~~
  2022-03-30 06:08:37.197 7 WARNING nova.virt.libvirt.driver [req-5c3296cf-88ee-4af6-ae6a-ddba99935e23 - - - - -] [instance: af339c99-1182-4489-b15c-21e52f50f724] Error monitoring migration: internal error: migration was active, but no RAM info was set: libvirt.libvirtError: internal error: migration was active, but no RAM info was set
  ~~~

  From upstream bug: https://bugzilla.redhat.com/show_bug.cgi?id=2074205

  [Other Information]
  Related bug: https://bugs.launchpad.net/nova/+bug/1982284

To manage notifications about this bug go to:
https://bugs.launchpad.net/cloud-archive/+bug/1994002/+subscriptions