[root@hpc7870 ~]# PAGER=cat journalctl -xu ceph-mds@hpc7870
-- Logs begin at Wed 2015-12-30 02:45:21 UTC, end at Tue 2016-03-01 20:43:01 UTC. --
<snip>
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: *** Caught signal (Segmentation fault) **
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: in thread 7fbc84a4f700
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: ceph version 9.2.0 (bb2ecea240f3a1d525bcb35670cb07bd1f0ca299)
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 1: (()+0x4b6fa2) [0x7fbc8a8fffa2]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 2: (()+0xf100) [0x7fbc89841100]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 3: (tc_new()+0x97) [0x7fbc89fe96c7]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 4: (std::string::_Rep::_S_create(unsigned long, unsigned long, std::allocator<char> const&)+0x59) [0x7fbc88fc4c69]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 5: (std::string::_Rep::_M_clone(std::allocator<char> const&, unsigned long)+0x1b) [0x7fbc88fc58ab]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 6: (std::string::reserve(unsigned long)+0x44) [0x7fbc88fc5954]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 7: (std::string::append(unsigned long, char)+0x46) [0x7fbc88fc5d36]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 8: (PrebufferedStreambuf::overflow(int)+0x30) [0x7fbc8a9cab00]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 9: (std::basic_streambuf<char, std::char_traits<char> >::xsputn(char const*, long)+0x36) [0x7fbc88fa6d66]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 10: (std::basic_ostream<char, std::char_traits<char> >& std::__ostream_insert<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)+0x215) [0x7fbc88f9dab5]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 11: (std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)+0x27) [0x7fbc88f9ddb7]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 12: (Server::handle_client_session(MClientSession*)+0x3c1) [0x7fbc8a672821]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 13: (Server::dispatch(Message*)+0x6ab) [0x7fbc8a6b033b]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 14: (MDSRank::handle_deferrable_message(Message*)+0x80c) [0x7fbc8a6381ec]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 15: (MDSRank::_dispatch(Message*, bool)+0x200) [0x7fbc8a642e40]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 16: (MDSRankDispatcher::ms_dispatch(Message*)+0x15) [0x7fbc8a643f35]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 17: (MDSDaemon::ms_dispatch(Message*)+0xf3) [0x7fbc8a62d473]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 18: (DispatchQueue::entry()+0x649) [0x7fbc8aae3479]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 19: (DispatchQueue::DispatchThread::entry()+0xd) [0x7fbc8a9d61dd]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 20: (()+0x7dc5) [0x7fbc89839dc5]
Feb 29 11:51:20 hpc7870.eng.fireeye.com ceph-mds[5060]: 21: (clone()+0x6d) [0x7fbc8872421d]
Feb 29 11:51:20 hpc7870.eng.fireeye.com systemd[1]: ceph-mds@hpc7870.service: main process exited, code=killed, status=11/SEGV
Feb 29 11:51:20 hpc7870.eng.fireeye.com systemd[1]: Unit ceph-mds@hpc7870.service entered failed state.
Feb 29 11:51:20 hpc7870.eng.fireeye.com systemd[1]: ceph-mds@hpc7870.service failed.