--- old/src/hotspot/share/gc/g1/g1ParallelCleaning.cpp	2019-11-21 11:57:12.983028027 +0100
+++ new/src/hotspot/share/gc/g1/g1ParallelCleaning.cpp	2019-11-21 11:57:12.551020730 +0100
@@ -39,7 +39,7 @@
     return false;
   }
 
-  return Atomic::cmpxchg(1, &_cleaning_claimed, 0) == 0;
+  return Atomic::cmpxchg(&_cleaning_claimed, 0, 1) == 0;
 }
 
 void JVMCICleaningTask::work(bool unloading_occurred) {