Jason/Ken, Can you please put it into ON_QA state so that i can mark this BUG as verified. It is currently in NEW state.
Marking this Bug as verified, I ran lots of librbd test for 2-3 days and i am unable to reproduce the same.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2015:1883