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[Bug 1194565] Re: Race condition exists for mac uniqueness

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>
Date: Thu, 05 Feb 2015 14:50:12 -0000
Reply-to: Bug 1194565 <1194565@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: neutron
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1194565

Title:
  Race condition exists for mac uniqueness

Status in OpenStack Neutron (virtual network service):
  Fix Released

Bug description:
  The mac uniqueness check is being done in code
  (https://github.com/openstack/quantum/blob/master/quantum/db/db_base_plugin_v2.py#L289)
  without explicit locking, which opens the door to a race condition if
  multiple requests try to secure the same mac.

  It probably makes sense to move the check into a uniqueness constraint
  on the model.

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