diff --git a/src/java.base/share/classes/java/util/concurrent/locks/AbstractQueuedLongSynchronizer.java b/src/java.base/share/classes/java/util/concurrent/locks/AbstractQueuedLongSynchronizer.java
index c50621090bb..9a18002ebd5 100644
--- a/src/java.base/share/classes/java/util/concurrent/locks/AbstractQueuedLongSynchronizer.java
+++ b/src/java.base/share/classes/java/util/concurrent/locks/AbstractQueuedLongSynchronizer.java
@@ -1156,7 +1156,9 @@ public abstract class AbstractQueuedLongSynchronizer
          */
         private boolean canReacquire(ConditionNode node) {
             // check links, not status to avoid enqueue race
-            return node != null && node.prev != null && isEnqueued(node);
+            Node p; // traverse unless known to be bidirectionally linked
+            return node != null && (p = node.prev) != null &&
+                (p.next == node || isEnqueued(node));
         }
 
         /**
diff --git a/src/java.base/share/classes/java/util/concurrent/locks/AbstractQueuedSynchronizer.java b/src/java.base/share/classes/java/util/concurrent/locks/AbstractQueuedSynchronizer.java
index 921150f58ca..618ba7b05f3 100644
--- a/src/java.base/share/classes/java/util/concurrent/locks/AbstractQueuedSynchronizer.java
+++ b/src/java.base/share/classes/java/util/concurrent/locks/AbstractQueuedSynchronizer.java
@@ -1524,7 +1524,9 @@ public abstract class AbstractQueuedSynchronizer
          */
         private boolean canReacquire(ConditionNode node) {
             // check links, not status to avoid enqueue race
-            return node != null && node.prev != null && isEnqueued(node);
+            Node p; // traverse unless known to be bidirectionally linked
+            return node != null && (p = node.prev) != null &&
+                (p.next == node || isEnqueued(node));
         }
 
         /**