(gdb) bt full
#0  0xb6fbd786 in ?? ()
No symbol table info available.
#1  0xb74223b3 in exit () from /lib/libc.so.6
No symbol table info available.
#2  0xb740c870 in __libc_start_main () from /lib/libc.so.6
No symbol table info available.
#3  0x08069561 in _start ()
No symbol table info available.