root@mds0:~# gdb /usr/lib/debug/usr/bin/cmds /core GNU gdb (GDB) 7.1-ubuntu Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". For bug reporting instructions, please see: ... Reading symbols from /usr/lib/debug/usr/bin/cmds...done. [New Thread 18272] [New Thread 18328] [New Thread 18334] [New Thread 18347] [New Thread 18273] [New Thread 18256] [New Thread 18327] [New Thread 18329] [New Thread 18262] [New Thread 18330] [New Thread 18263] [New Thread 18331] [New Thread 18326] [New Thread 18332] [New Thread 18335] [New Thread 18336] [New Thread 18337] [New Thread 18346] [New Thread 18348] [New Thread 18349] [New Thread 18258] [New Thread 18261] [New Thread 18268] warning: Unable to find dynamic linker breakpoint function. GDB will be unable to debug shared library initializers and track explicitly loaded dynamic code. Core was generated by `/usr/bin/cmds -i 0 -c /etc/ceph/ceph.conf'. Program terminated with signal 11, Segmentation fault. #0 CDentry::get_dir (this=0x94c4d0, mds=0x15592c0) at mds/events/../CDentry.h:196 196 mds/events/../CDentry.h: No such file or directory. in mds/events/../CDentry.h (gdb) bt #0 CDentry::get_dir (this=0x94c4d0, mds=0x15592c0) at mds/events/../CDentry.h:196 #1 LogSegment::try_to_expire (this=0x94c4d0, mds=0x15592c0) at mds/journal.cc:105 #2 0x00007f44d42c5e00 in ?? () #3 0x00007f44d4a640ea in ?? () #4 0x00000002385a9c71 in ?? () #5 0x0000000000025824 in ?? () #6 0x00000000000038c0 in ?? () #7 0x00007f44d4e168e9 in ?? () #8 0x0000000000000000 in ?? () (gdb)