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

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From: Launchpad Bug Tracker <1994002@xxxxxxxxxxxxxxxxxx>
Date: Wed, 16 Nov 2022 02:37:19 -0000
Reply-to: Bug 1994002 <1994002@xxxxxxxxxxxxxxxxxx>
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You have been subscribed to a public bug by Brett Milford (brettmilford):

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

[Impact]

 * 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.

** Affects: cloud-archive
     Importance: Undecided
         Status: New

** Affects: cloud-archive/ussuri
     Importance: Undecided
     Assignee: Brett Milford (brettmilford)
         Status: New

** Affects: qemu (Ubuntu)
     Importance: Undecided
     Assignee: Brett Milford (brettmilford)
         Status: New

** Affects: qemu (Ubuntu Focal)
     Importance: Undecided
     Assignee: Brett Milford (brettmilford)
         Status: New

** Affects: qemu (Ubuntu Jammy)
     Importance: Undecided
     Assignee: Brett Milford (brettmilford)
         Status: New

** Affects: qemu (Ubuntu Kinetic)
     Importance: Undecided
     Assignee: Brett Milford (brettmilford)
         Status: New


** Tags: patch seg sru-needed sts
-- 
[SRU] migration was active, but no RAM info was set
https://bugs.launchpad.net/bugs/1994002
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