*** Caught signal (Segmentation fault) **
 in thread 7f79770d7700
 ceph version 0.44.1-170-g0df6fbd (commit:0df6fbd3a66741ad02c7556b0c4026dc3577d797)
 1: /usr/bin/ceph-mds() [0x7dec21]
 2: (()+0xfb40) [0x7f797b355b40]
 3: (Server::handle_client_stat(MDRequest*)+0x585) [0x50d785]
 4: (Server::dispatch_client_request(MDRequest*)+0x426) [0x52b726]
 5: (Server::handle_client_request(MClientRequest*)+0x422) [0x52f352]
 6: (Server::dispatch(Message*)+0x2ab) [0x52fb7b]
 7: (MDS::handle_deferrable_message(Message*)+0xadf) [0x4a19ff]
 8: (MDS::_dispatch(Message*)+0x1317) [0x4b8e97]
 9: (MDS::ms_dispatch(Message*)+0x26a) [0x4b973a]
 10: (SimpleMessenger::dispatch_entry()+0x829) [0x7a86f9]
 11: (SimpleMessenger::DispatchThread::entry()+0xd) [0x732f6d]
 12: (()+0x7971) [0x7f797b34d971]
 13: (clone()+0x6d) [0x7f7979bdc92d]