0x1008ec80: subl	$12,%esp

0x1008ec83: movl	0x18(%esp),%eax   ;<- load arg_8 to eax

0x1008ec87: movl	0x10(%esp),%ecx

0x1008ec8b: flds	0xc(%eax)        ; <- here is the crash (eax is NULL)

....