=> 0x7f2c18ef8e50 <pthread_mutex_destroy>:	testb  $0x10,0x10(%rdi)
   0x7f2c18ef8e54 <pthread_mutex_destroy+4>:	jne    0x7f2c18ef8e68 <pthread_mutex_destroy+24>
   0x7f2c18ef8e56 <pthread_mutex_destroy+6>:	mov    0xc(%rdi),%edx
   0x7f2c18ef8e59 <pthread_mutex_destroy+9>:	mov    $0x10,%eax
   0x7f2c18ef8e5e <pthread_mutex_destroy+14>:	test   %edx,%edx
   0x7f2c18ef8e60 <pthread_mutex_destroy+16>:	je     0x7f2c18ef8e68 <pthread_mutex_destroy+24>
   0x7f2c18ef8e62 <pthread_mutex_destroy+18>:	repz retq 
   0x7f2c18ef8e64 <pthread_mutex_destroy+20>:	nopl   0x0(%rax)
   0x7f2c18ef8e68 <pthread_mutex_destroy+24>:	movl   $0xffffffff,0x10(%rdi)
   0x7f2c18ef8e6f <pthread_mutex_destroy+31>:	xor    %eax,%eax
   0x7f2c18ef8e71 <pthread_mutex_destroy+33>:	retq   
   0x7f2c18ef8e72:	nop
   0x7f2c18ef8e73:	nop
   0x7f2c18ef8e74:	nop
   0x7f2c18ef8e75:	nop
   0x7f2c18ef8e76:	nop