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[Lee Yarwood <1902276@xxxxxxxxxxxxxxxxxx>]

** No longer affects: nova

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https://bugs.launchpad.net/bugs/1902276

Title:
  libvirtd going into a tight loop causing instances to not transition
  to ACTIVE

Status in libvirt package in Ubuntu:
  New

Bug description:
  Description
  ===========
  This is current master branch (wallaby) of OpenStack.

  We seen this regularly, but it's intermittent. Said another way: We
  see it on jobs daily, but it's not every run.

  We are seeing nova instances that do not transition to ACTIVE inside
  five minutes. Investigating this led us to find that libvirtd seems to
  be going into a tight loop on an instance delete.

  The 136MB log is here:
  https://storage.gra.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_c77/759973/3/check/octavia-v2-dsvm-
  scenario/c77fe63/controller/logs/libvirt/libvirtd_log.txt

  The overall job logs are here:
  https://zuul.opendev.org/t/openstack/build/c77fe63a94ef4298872ad5f40c5df7d4/logs

  When running the Octavia scenario test suite, we occasionally see nova
  instances fail to become ACTIVE in a timely manner, causing timeouts
  and failures. In investigating this issue we found the libvirtd log
  was 136MB.

  Most of the file is full of this repeating:
  2020-10-28 23:45:06.330+0000: 20852: debug : qemuMonitorIO:767 : Error on monitor internal error: End of file from qemu monitor
  2020-10-28 23:45:06.330+0000: 20852: debug : qemuMonitorIO:788 : Triggering EOF callback
  2020-10-28 23:45:06.330+0000: 20852: debug : qemuProcessHandleMonitorEOF:301 : Received EOF on 0x7f6278014ca0 'instance-00000001'
  2020-10-28 23:45:06.330+0000: 20852: debug : qemuProcessHandleMonitorEOF:305 : Domain is being destroyed, EOF is expected

  Here is a snippet for the lead in to the repeated lines:
  http://paste.openstack.org/show/799559/

  It appears to be a tight loop, repeating many times per second.

  Eventually it does stop and things seem to go back to normal in nova.

  Here is the snippet of the end of the loop in the log:
  http://paste.openstack.org/show/799560/

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