or download this
(gdb) bt
#0 0x080d2fb0 in S_find_byclass () at eval.c:41
...
#6 0x08059fd0 in main () at eval.c:41
#7 0x40073177 in __libc_start_main (main=0x8059f60 <main>, argc=4, ub
+p_av=0xbffff8fc, init=0x8059194 <_init>, fini=0x80dfa00 <_fini>,
rtld_fini=0x4000e184 <_dl_fini>, stack_end=0xbffff8ec) at ../sysde
+ps/generic/libc-start.c:129