(gdb) bt
#0  0x08078a86 in Perl_pad_free () at eval.c:41
#1  0x08078d57 in S_op_clear () at eval.c:41
#2  0x08078be9 in Perl_op_free () at eval.c:41
#3  0x08078ba8 in Perl_op_free () at eval.c:41
#4  0x08078ba8 in Perl_op_free () at eval.c:41
#5  0x08078ba8 in Perl_op_free () at eval.c:41
#6  0x08078ba8 in Perl_op_free () at eval.c:41
#7  0x080bd376 in S_doeval () at eval.c:41
#8  0x080be494 in Perl_pp_require () at eval.c:41
#9  0x08097b40 in Perl_runops_standard () at eval.c:41
#10 0x0805cd18 in S_call_body () at eval.c:41
#11 0x0805cae6 in perl_call_sv () at eval.c:41
#12 0x0805f4db in S_call_list_body () at eval.c:41
#13 0x0805f1ce in Perl_call_list () at eval.c:41
#14 0x0807fed3 in Perl_newATTRSUB () at eval.c:41
#15 0x0807d086 in Perl_utilize () at eval.c:41
#16 0x080769fa in Perl_yyparse () at eval.c:41
#17 0x0805c063 in S_parse_body () at eval.c:41
#18 0x0805b7ee in perl_parse () at eval.c:41
#19 0x08059ee9 in main () at eval.c:41