src/java.base/share/classes/java/lang/ref/Reference.java

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@@ -98,11 +98,11 @@
      *     pending:   this
      *    Enqueued:   next reference in queue (or this if last)
      *    Inactive:   this
      */
     @SuppressWarnings("rawtypes")
-    Reference next;
+    volatile Reference next;
 
     /* When active:   next element in a discovered reference list maintained by GC (or this if last)
      *     pending:   next element in the pending list (or null if last)
      *   otherwise:   NULL
      */