[Bug 1722951] Fix included in openstack/swift ocata-eol

[OpenStack Infra]

This issue was fixed in the openstack/swift ocata-eol release.

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https://bugs.launchpad.net/bugs/1722951

Title:
  Container updater may be stuck and not make progress

Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive ocata series:
  Triaged
Status in Ubuntu Cloud Archive pike series:
  Triaged
Status in Ubuntu Cloud Archive queens series:
  Fix Released
Status in Ubuntu Cloud Archive rocky series:
  Fix Released
Status in OpenStack Object Storage (swift):
  Fix Released
Status in swift package in Ubuntu:
  Fix Released

Bug description:
  Container updater may be stuck and not make further progress. This was
  reported after the "PipeMutex" primitive was added to fix a deadlock
  in the logging layer. The bug can be reproduced with the attached
  python script.

  The observed behavior is that after some time the container stats are
  no longer updated and strace for the daemons shows that they are all
  stuck in "epoll_wait".

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