2016-05-18 10:36:34.295957 7fb3240837a0  0 ceph version 0.87.2 (87a7cec9ab11c677de2ab23a7668a77d2f5b955e), process ceph-mds, pid 31668
2016-05-18 10:36:34.319204 7fb3240837a0 -1 monclient(hunting): ERROR: missing keyring, cannot use cephx for authentication
2016-05-18 10:36:34.320437 7fb3240837a0 -1 mds.-1.0 ERROR: failed to authenticate: (95) Operation not supported
2016-05-18 10:36:34.320459 7fb3240837a0  1 mds.-1.0 suicide.  wanted down:dne, now up:boot
2016-05-18 10:36:34.321412 7fb3240837a0 -1 common/Thread.cc: In function 'int Thread::join(void**)' thread 7fb3240837a0 time 2016-05-18 10:36:34.320534
common/Thread.cc: 136: FAILED assert("join on thread that was never started" == 0)

 ceph version 0.87.2 (87a7cec9ab11c677de2ab23a7668a77d2f5b955e)
 1: (Thread::join(void**)+0x41) [0x97af81]
 2: (MDS::ProgressThread::shutdown()+0x76) [0x5785f6]
 3: (MDS::suicide()+0x23d) [0x57ec8d]
 4: (MDS::init(MDSMap::DaemonState)+0x2714) [0x588594]
 5: (main()+0xe91) [0x577cc1]
 6: (__libc_start_main()+0xfd) [0x7fb32253cd5d]
 7: /usr/bin/ceph-mds() [0x576799]
 NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.

--- begin dump of recent events ---