8371502: serviceability/jvmti/vthread/ThreadListStackTracesTest/ThreadListStackTracesTest.java failing

Reviewed-by: lmesnik, amenkov
Backport-of: c46bed7

Author: Serguei Spitsyn

test/hotspot/jtreg/serviceability/jvmti/vthread/ThreadListStackTracesTest/ThreadListStackTracesTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2023, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -44,6 +44,13 @@ static void sleep(long millis) {
         }
     }
 
+    public void ensureReadyAndWaiting(Thread vt, Thread.State expState, ReentrantLock rlock) {
+        // wait while the thread is not ready or thread state is unexpected
+        while (!threadReady || (vt.getState() != expState) || !rlock.hasQueuedThreads()) {
+            sleep(1);
+        }
+    }
+
     public void ensureReady(Thread vt, Thread.State expState) {
         // wait while the thread is not ready or thread state is unexpected
         while (!threadReady || (vt.getState() != expState)) {
@@ -97,7 +104,7 @@ private static void checkReentrantLock() throws InterruptedException {
         String name = "ReentrantLockTestTask";
         TestTask task = new ReentrantLockTestTask();
         Thread vt = Thread.ofVirtual().name(name).start(task);
-        task.ensureReady(vt, expState);
+        task.ensureReadyAndWaiting(vt, expState, reentrantLock);
         checkStates(vt, expState);
     }