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[Launchpad Bug Tracker <1312964@xxxxxxxxxxxxxxxxxx>]

[Expired for neutron because there has been no activity for 60 days.]

** Changed in: neutron
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1312964

Title:
  lock wait timeout in update_port_status

Status in neutron:
  Expired

Bug description:
  There have been several occurences of this bug in check/gate queues.

  http://logstash.openstack.org/#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

  
  266 hits in 7 days at the time of bug report, excluding havana jobs (which are susceptible to lock wait timeout errors anyway because of fixes not backportable from icehouse)
  Build failure rate: 20.6%
  Hits in gate queue: 26
  Failures in gate queue: 1

  Notes:
  1) Occurrences and failure rate in gate queue are lower because most of the failure happen with the full job, which is not yet voting.
  2) Even if failure rate is generally low, a lock wait timeout should be always considered an error, regardless of the outcome of the build job.
  3) A detailed look at the logs reveals a pattern similar to bug 1283522, whose fingerprint is being matched. It seems the semaphore lock is ignored, but lockutils lacks the necessary logging to reveal whether a semaphore has been released or not; more investigations are in progress.

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