intermittend problem with the new ceph::mutex

Hi Kefu, Can you take a look at: http://cephdev.digiware.nl:8180/jenkins/job/ceph-master/3614/consoleFull And see if you can figure out why fails. It does so on and off when run from jenkins. If I use ctest from the commandline it just completes with no errors. Or I expect some extra debugging stuff possible in the Class, given some of the names in the backtrace.... Thanx, --WjW