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[Bug 1252409] Re: use of threading in libvirt driver causes deadlock when connecting to libvirtd

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Alan Pevec <1252409@xxxxxxxxxxxxxxxxxx>
Date: Mon, 22 Sep 2014 13:07:34 -0000
Reply-to: Bug 1252409 <1252409@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Also affects: nova/havana
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1252409

Title:
  use of threading in libvirt driver causes deadlock when connecting to
  libvirtd

Status in OpenStack Compute (Nova):
  Fix Released
Status in OpenStack Compute (nova) havana series:
  New

Bug description:
  the libvirt driver was running into this issue
  https://bitbucket.org/eventlet/eventlet/issue/137/use-of-threading-
  locks-causes-deadlock when trying to connect to the libvirtd daemon.

  the driver has logging messages during the _connect method which was
  called within a native thread. The logging code takes out a eventlet
  lock and mixing OS native threads and eventlet locks causes deadlocks
  due to the above eventlet bug. The resulting deadlock was enough to
  hang the nova-compute process.

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