(gdb) disas pop_ret
Dump of assembler code for function pop_ret:
=> 0x0804a028 <+0>: pop    ecx
   0x0804a029 <+1>: ret
   0x0804a02a <+2>: add    BYTE PTR [eax],al
   0x0804a02c <+4>: add    BYTE PTR [eax],al
   0x0804a02e <+6>: add    BYTE PTR [eax],al
   0x0804a030 <+8>: add    BYTE PTR [eax],al
   0x0804a032 <+10>:    add    BYTE PTR [eax],al
   0x0804a034 <+12>:    add    BYTE PTR [eax],al
   0x0804a036 <+14>:    add    BYTE PTR [eax],al
End of assembler dump.
(gdb) x/4wx $esp
0xffffd4d4: 0x0804a060  0xf7e371e0  0xdeadbeef  0x00000000
(gdb) x/x 0x0804a060
0x804a060 <command>:    0x69622f2f
(gdb) x/s 0x0804a060
0x804a060 <command>:    "//bin/ls"
(gdb) i r ecx
ecx            0xf7fd8000   -134381568
(gdb) x/x 0xf7fd8000
0xf7fd8000: 0x0a
(gdb) x/s 0xf7fd8000
0xf7fd8000: "\nirst\n"
(gdb) si

Program terminated with signal SIGSEGV, Segmentation fault.
The program no longer exists.