ceph version 0.61.2-57-g8544ea7 (8544ea751884617616addc17b4467b9a86bd9d8a)
 1: /usr/bin/ceph-mon() [0x5999fa]
 2: (()+0xfcb0) [0x7f774bdb6cb0]
 3: (gsignal()+0x35) [0x7f774a2a1425]
 4: (abort()+0x17b) [0x7f774a2a4b8b]
 5: (__gnu_cxx::__verbose_terminate_handler()+0x11d) [0x7f774abf369d]
 6: (()+0xb5846) [0x7f774abf1846]
 7: (()+0xb5873) [0x7f774abf1873]
 8: (()+0xb596e) [0x7f774abf196e]
 9: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x1df) [0x6529ef]
 10: (PerfCountersCollection::remove(PerfCounters*)+0x24f) [0x6a04ef]
 11: (LevelDBStore::~LevelDBStore()+0x1b) [0x58324b]
 12: (LevelDBStore::~LevelDBStore()+0x9) [0x5834c9]
 13: (Monitor::StoreConverter::needs_conversion()+0x20a) [0x4a950a]
 14: (main()+0x44b) [0x48cb8b]
 15: (__libc_start_main()+0xed) [0x7f774a28c76d]
 16: /usr/bin/ceph-mon() [0x49098d]
 NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.