Ivo: it is actually:
commit 6fe5f6846dc725e94702564096ed7199bb37baf3
Author: Clebert Suconic <clebertsuconic>
Date: Thu Nov 5 16:38:10 2015 -0500
HORNETQ-1501 - ServerConsumer::cancelRefs is not thread safe - fixing issue
(cherry picked from commit eb55c784e2aab4ee16899d682f48c85554461a41)
It's the first issue hit with the user.