--- old/src/hotspot/share/gc/parallel/psParallelCompact.hpp	2019-11-15 10:16:14.242379373 +0100
+++ new/src/hotspot/share/gc/parallel/psParallelCompact.hpp	2019-11-15 10:16:13.858377469 +0100
@@ -643,7 +643,8 @@
 }
 
 void ParallelCompactData::RegionData::mark_normal() {
-  _shadow_state = FINISH;
+  int old = Atomic::cmpxchg(FINISH, &_shadow_state, SHADOW);
+  assert(old == SHADOW, "Fail to mark the region as finish");
 }
 
 inline ParallelCompactData::RegionData*