When the broker is running with async store and if the producer doesn't sync then the broker can go out of memory. Gordon mentioned that this was fixed in the new code path. We can close this bz after Gordon is happy with testing etc.
qpidc-0.2.656926-1.el5, qpidd-0.2.656926-1.el5, and rhm-0.2.2058-1.el5 have been pushed to the staging repo for testing