--- a/src/hotspot/share/gc/shared/satbMarkQueue.cpp	Mon Nov 25 12:32:40 2019 +0100
+++ b/src/hotspot/share/gc/shared/satbMarkQueue.cpp	Mon Nov 25 12:33:15 2019 +0100
@@ -136,7 +136,7 @@
     value += 2;
     assert(value > old, "overflow");
     if (value > threshold) value |= 1;
-    value = Atomic::cmpxchg(value, cfptr, old);
+    value = Atomic::cmpxchg(cfptr, old, value);
   } while (value != old);
 }
 
@@ -149,7 +149,7 @@
     old = value;
     value -= 2;
     if (value <= 1) value = 0;
-    value = Atomic::cmpxchg(value, cfptr, old);
+    value = Atomic::cmpxchg(cfptr, old, value);
   } while (value != old);
 }