Comment 3 for bug 1193199

Seeing a similar deadlock on the old side of grenade which would be stable/icehouse now:

http://logs.openstack.org/60/109660/7/check/check-grenade-dsvm-partial-ncpu/deb4b82/logs/old/screen-n-api.txt.gz#_2014-07-28_19_59_01_933

This is in a security group test but I'm not sure that matters.

Bug 1297590 seems related.