(gdb) bt full
#0  0xb7f586ea in ?? ()
No symbol table info available.
#1  0xbfaa66b8 in ?? ()
No symbol table info available.
#2  0xb7c23d40 in ?? ()
No symbol table info available.
#3  0x00000000 in ?? ()
No symbol table info available.

(gdb) bt
#0  0xb7f586ea in ?? ()
#1  0xbfaa66b8 in ?? ()
#2  0xb7c23d40 in ?? ()
#3  0x00000000 in ?? ()