2012-09-14 16:37:59.292407 7fc1d6240700 -1 *** Caught signal (Segmentation fault) **
 in thread 7fc1d6240700

 ceph version 0.51-469-ga672972 (commit:a672972fe36b94896ff73ca98c90008cd5da984f)
 1: /tmp/cephtest/binary/usr/local/bin/ceph-mds() [0x80ee31]
 2: (()+0xfcb0) [0x7fc1dafb2cb0]
 3: (CDentry::_mark_dirty(LogSegment*)+0x78) [0x63b038]
 4: (CDentry::mark_dirty(unsigned long, LogSegment*)+0x79) [0x63b1e9]
 5: (Server::_unlink_local_finish(MDRequest*, CDentry*, CDentry*, unsigned long)+0x2a1) [0x521631]
 6: (Context::complete(int)+0x12) [0x4ae2a2]
 7: (finish_contexts(CephContext*, std::list<Context*, std::allocator<Context*> >&, int)+0x12b) [0x4d30cb]
 8: (Journaler::_finish_flush(int, unsigned long, utime_t)+0x1df) [0x6b548f]
 9: (Objecter::handle_osd_op_reply(MOSDOpReply*)+0xefd) [0x6ceead]
 10: (MDS::handle_core_message(Message*)+0xadf) [0x4ce52f]
 11: (MDS::_dispatch(Message*)+0x32) [0x4ce6f2]
 12: (MDS::ms_dispatch(Message*)+0x21b) [0x4d03fb]
 13: (DispatchQueue::entry()+0x711) [0x7e7461]
 14: (DispatchQueue::DispatchThread::entry()+0xd) [0x76e39d]
 15: (()+0x7e9a) [0x7fc1dafaae9a]
 16: (clone()+0x6d) [0x7fc1d95524bd]
 NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.