-rw-------   1 root  wheel     11292672 Jul 19 21:15 asterisk.core

(gdb) bt
#0  0x2829d4ab in pthread_testcancel () from /usr/lib/libpthread.so.2
#1  0x28295e3c in pthread_mutexattr_init () from /usr/lib/libpthread.so.2
#2  0x2810a450 in ?? ()
(gdb) bt full
#0  0x2829d4ab in pthread_testcancel () from /usr/lib/libpthread.so.2
No symbol table info available.
#1  0x28295e3c in pthread_mutexattr_init () from /usr/lib/libpthread.so.2
No symbol table info available.
#2  0x2810a450 in ?? ()
No symbol table info available.