0> 2013-04-09 21:28:44.394392 7fecbdcbb700 -1 *** Caught signal (Segmentation fault) **
 in thread 7fecbdcbb700

 ceph version 0.60 (f26f7a39021dbf440c28d6375222e21c94fe8e5c)
 1: /usr/bin/ceph-mds() [0x84364a]
 2: (()+0xfcb0) [0x7fecc28b1cb0]
 3: (Mutex::Lock(bool)+0x1b) [0x76e4fb]
 4: (SimpleMessenger::mark_down(Connection*)+0x4b) [0x788f8b]
 5: (Server::_session_logged(Session*, unsigned long, bool, unsigned long, interval_set<inodeno_t>&, unsigned long)+0xd3f) [0x51805f]
 6: (C_MDS_session_finish::finish(int)+0x37) [0x55c9d7]
 7: (Context::complete(int)+0xa) [0x4b219a]
 8: (finish_contexts(CephContext*, std::list<Context*, std::allocator<Context*> >&, int)+0x95) [0x4d5655]
 9: (Journaler::_finish_flush(int, unsigned long, utime_t)+0x19f) [0x6caa8f]
 10: (Objecter::handle_osd_op_reply(MOSDOpReply*)+0xe55) [0x6e6f25]
 11: (MDS::handle_core_message(Message*)+0xae8) [0x4d1018]
 12: (MDS::_dispatch(Message*)+0x2f) [0x4d11df]
 13: (MDS::ms_dispatch(Message*)+0x1db) [0x4d2c7b]
 14: (DispatchQueue::entry()+0x341) [0x813491]
 15: (DispatchQueue::DispatchThread::entry()+0xd) [0x7901ad]
 16: (()+0x7e9a) [0x7fecc28a9e9a]
 17: (clone()+0x6d) [0x7fecc174acbd]