--- glibc-2.27/sysdeps/x86_64/atomic-machine.h~	2018-02-01 16:17:18.000000000 +0000
+++ glibc-2.27/sysdeps/x86_64/atomic-machine.h	2018-04-28 14:19:06.374119197 +0000
@@ -409,7 +409,7 @@
      __result; })
 
 
-#define atomic_spin_nop() asm ("rep; nop")
+#define atomic_spin_nop() asm ("lfence")
 
 
 #define __arch_and_body(lock, mem, mask) \