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[OpenStack Infra <1482271@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/222173
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=691d497885cf4d8b39bb6ddb384b7c027bb52f95
Submitter: Jenkins
Branch:    master

commit 691d497885cf4d8b39bb6ddb384b7c027bb52f95
Author: Boris Bobrov <bbobrov@xxxxxxxxxxxx>
Date:   Thu Sep 3 16:05:55 2015 +0500

    Move region configuration to a critical section
    
    Cache initialization performed on the request handling
    after Apache wsgi module start raises exception
    region.RegionAlreadyConfigured on race condition
    in multithreaded mode.
    
    Change-Id: I65f85aedd5b087499b889540417b9502e050ce7c
    Closes-bug: 1482271


** Changed in: keystone
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1482271

Title:
  Race condition in multithreaded Apache/WSGI setup

Status in OpenStack Identity (keystone):
  Fix Released

Bug description:
  When configured as an Apache WSGI module a race condition is possible during keystone cache initialization:
  https://github.com/openstack/keystone/blob/a597a86b854215835a4d54885daeb161d7b0efb8/keystone/common/kvs/core.py#L240
  The operation raises exception region.RegionAlreadyConfigured.
  This is a result of the race condition involving global 'application' variable being initialized several times (1 per thread).
  application is required to be global according to Paste Deploy documentation:
  http://pythonpaste.org/deploy/
  Apache modwsgi documentation suggests protecting global objects with thread locks:
  http://code.google.com/p/modwsgi/wiki/ProcessesAndThreading#Building_A_Portable_Application

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