ceph version 0.60 (f26f7a39021dbf440c28d6375222e21c94fe8e5c)
 1: /usr/bin/ceph-mon() [0x5834fa]
 2: (()+0xfcb0) [0x7f70bfdefcb0]
 3: (gsignal()+0x35) [0x7f70be9c5425]
 4: (abort()+0x17b) [0x7f70be9c8b8b]
 5: (__gnu_cxx::__verbose_terminate_handler()+0x11d) [0x7f70bf31769d]
 6: (()+0xb5846) [0x7f70bf315846]
 7: (()+0xb5873) [0x7f70bf315873]
 8: (()+0xb596e) [0x7f70bf31596e]
 9: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x1df) [0x636c8f]
 10: (PaxosService::propose_pending()+0x46d) [0x4dee3d]
 11: (MDSMonitor::tick()+0x1c62) [0x51cdd2]
 12: (MDSMonitor::on_active()+0x1a) [0x512ada]
 13: (PaxosService::_active()+0x31d) [0x4e067d]
 14: (Context::complete(int)+0xa) [0x4b7b4a]
 15: (finish_contexts(CephContext*, std::list<Context*, std::allocator<Context*> >&, int)+0x95) [0x4ba5a5]
 16: (Paxos::handle_last(MMonPaxos*)+0xbef) [0x4da92f]
 17: (Paxos::dispatch(PaxosServiceMessage*)+0x26b) [0x4dad8b]
 18: (Monitor::_ms_dispatch(Message*)+0x149f) [0x4b310f]
 19: (Monitor::ms_dispatch(Message*)+0x32) [0x4c9d12]
 20: (DispatchQueue::entry()+0x341) [0x698da1]
 21: (DispatchQueue::DispatchThread::entry()+0xd) [0x626c5d]
 22: (()+0x7e9a) [0x7f70bfde7e9a]
 23: (clone()+0x6d) [0x7f70bea82cbd]
 NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.