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

[Launchpad Bug Tracker]

This bug was fixed in the package qemu - 1:2.11+dfsg-1ubuntu7.42

---------------
qemu (1:2.11+dfsg-1ubuntu7.42) bionic; urgency=medium

  [ Brett Milford ]
  * d/p/u/lp1994002-migration-Read-state-once.patch: Fix for libvirt
    error 'migration was active, but no RAM info was set' (LP: #1994002)

  [ Mauricio Faria de Oliveira ]
  * d/p/u/lp2009048-vfio_map_dma_einval_amd_iommu_1tb.patch: Add hint
    to VFIO_MAP_DMA error on AMD IOMMU for VMs with ~1TB+ RAM (LP: #2009048)

 -- Mauricio Faria de Oliveira <mfo at canonical.com>  Thu, 02 Mar 2023
18:26:12 -0300

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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:
  Fix Released
Status in qemu source package in Bionic:
  Fix Released
Status in qemu source package in Focal:
  Fix Released
Status in qemu source package in Jammy:
  Fix Released
Status in qemu source package in Kinetic:
  Fix Released

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]

  Synthetic reproducer with GDB in comment #21.

  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.
  In an environment where it has been observed it is estimated to occur approximately 1/1000 migrations.

  [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

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