root@ceph05:~# gdb /usr/lib/debug/usr/bin/cosd /core.ceph05.2526 
GNU gdb (GDB) 7.1-ubuntu
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License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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Reading symbols from /usr/lib/debug/usr/bin/cosd...done.
[New Thread 2641]
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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/cosd -i 5 -c /etc/ceph/ceph.conf'.
Program terminated with signal 6, Aborted.
#0  0x00007fe975a8ba75 in ?? ()
(gdb) bt
#0  0x00007fe975a8ba75 in ?? ()
#1  0x00007fe975a8f5c0 in ?? ()
#2  0x0000000000000000 in ?? ()
(gdb)