--- old/src/hotspot/share/utilities/bitMap.inline.hpp	2019-11-21 11:55:42.713502603 +0100
+++ new/src/hotspot/share/utilities/bitMap.inline.hpp	2019-11-21 11:55:42.457498276 +0100
@@ -72,7 +72,7 @@
     if (new_val == old_val) {
       return false;     // Someone else beat us to it.
     }
-    const bm_word_t cur_val = Atomic::cmpxchg(new_val, addr, old_val, memory_order);
+    const bm_word_t cur_val = Atomic::cmpxchg(addr, old_val, new_val, memory_order);
     if (cur_val == old_val) {
       return true;      // Success.
     }
@@ -91,7 +91,7 @@
     if (new_val == old_val) {
       return false;     // Someone else beat us to it.
     }
-    const bm_word_t cur_val = Atomic::cmpxchg(new_val, addr, old_val, memory_order);
+    const bm_word_t cur_val = Atomic::cmpxchg(addr, old_val, new_val, memory_order);
     if (cur_val == old_val) {
       return true;      // Success.
     }