Comment 23 for bug 1179955

Rob -- did you issue this OSSN already? If not ..

May need to clarify Memcache without DB backend ( in "If you deploy using Memcache .." ), where flushing cache would resolve the issue. If there is a DB behind it, your next paragraph with DB script necessary to clean up.

And given Chmouel's fix has been committed .. please add

 "Patch https://review.openstack.org/39878 addresses the issue and will be part of the next official release of OpenStack/Keystone. "

Regards
Malini