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[Dan Smith <dms@xxxxxxxxxxxxx>]

Public bug reported:

The following message in nova gate test logs shows that libvirt live
migration can stall on some sort of deadlock:

2016-01-28 16:53:20.878 INFO nova.virt.libvirt.driver [req-692a1f4f-
16aa-4d93-a694-1f7eef4df9f6 tempest-
LiveBlockMigrationTestJSON-1471114638 tempest-
LiveBlockMigrationTestJSON-1937054400] [instance:
7b1bc0e2-a6a9-4d85-a3f9-4568d52d1f1b] Migration running for 30 secs,
memory 100% remaining; (bytes processed=0, remaining=0, total=0)

Additionally, the libvirt logger thread seems to be deadlocked before
this happens.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1539271

Title:
  Libvirt live migration stalls

Status in OpenStack Compute (nova):
  New

Bug description:
  The following message in nova gate test logs shows that libvirt live
  migration can stall on some sort of deadlock:

  2016-01-28 16:53:20.878 INFO nova.virt.libvirt.driver [req-692a1f4f-
  16aa-4d93-a694-1f7eef4df9f6 tempest-
  LiveBlockMigrationTestJSON-1471114638 tempest-
  LiveBlockMigrationTestJSON-1937054400] [instance:
  7b1bc0e2-a6a9-4d85-a3f9-4568d52d1f1b] Migration running for 30 secs,
  memory 100% remaining; (bytes processed=0, remaining=0, total=0)

  Additionally, the libvirt logger thread seems to be deadlocked before
  this happens.

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