rare failures in testForkHelpQuiesce tck tests

----------System.out:(0/0)----------
----------System.err:(254/17673)----------
junit.framework.AssertionFailedError: expected:<21> but was:<8>
------ stacktrace dump start ------
"main" prio=5 Id=1 WAITING on java.lang.Thread@255c541f
at java.base@13-ea/java.lang.Object.wait(Native Method)
- waiting on java.lang.Thread@255c541f
at java.base@13-ea/java.lang.Thread.join(Thread.java:1303)
at java.base@13-ea/java.lang.Thread.join(Thread.java:1371)
at app//com.sun.javatest.regtest.agent.MainWrapper.main(MainWrapper.java:74)

"Reference Handler" daemon prio=10 Id=2 RUNNABLE
at java.base@13-ea/java.lang.ref.Reference.waitForReferencePendingList(Native Method)
at java.base@13-ea/java.lang.ref.Reference.processPendingReferences(Reference.java:241)
at java.base@13-ea/java.lang.ref.Reference$ReferenceHandler.run(Reference.java:213)

"Common-Cleaner" daemon prio=8 Id=10 TIMED_WAITING on java.lang.ref.ReferenceQueue$Lock@4442cad6
at java.base@13-ea/java.lang.Object.wait(Native Method)
- waiting on java.lang.ref.ReferenceQueue$Lock@4442cad6
at java.base@13-ea/java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:155)
at java.base@13-ea/jdk.internal.ref.CleanerImpl.run(CleanerImpl.java:148)
at java.base@13-ea/java.lang.Thread.run(Thread.java:830)
at java.base@13-ea/jdk.internal.misc.InnocuousThread.run(InnocuousThread.java:134)

"MainThread" prio=5 Id=13 WAITING on ForkJoinTask8Test$8@b2b8c10
at java.base@13-ea/java.lang.Object.wait(Native Method)
- waiting on ForkJoinTask8Test$8@b2b8c10
at java.base@13-ea/java.util.concurrent.ForkJoinTask.externalAwaitDone(ForkJoinTask.java:330)
at java.base@13-ea/java.util.concurrent.ForkJoinTask.doJoin(ForkJoinTask.java:398)
at java.base@13-ea/java.util.concurrent.ForkJoinTask.join(ForkJoinTask.java:721)
at java.base@13-ea/java.util.concurrent.ForkJoinPool.invoke(ForkJoinPool.java:2432)
at app//ForkJoinTask8Test.testInvokeOnPool(ForkJoinTask8Test.java:110)
at app//ForkJoinTask8Test.testForkHelpQuiesce(ForkJoinTask8Test.java:565)
at app//ForkJoinTask8Test.testForkHelpQuiesce(ForkJoinTask8Test.java:551)
...

"ForkJoinPool.commonPool-worker-3" daemon prio=5 Id=781 WAITING on java.util.concurrent.ForkJoinPool@4c10cdc6
at java.base@13-ea/jdk.internal.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.ForkJoinPool@4c10cdc6
at java.base@13-ea/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
at java.base@13-ea/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1633)
at java.base@13-ea/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

"ForkJoinPool.commonPool-worker-5" daemon prio=5 Id=782 WAITING on java.util.concurrent.ForkJoinPool@4c10cdc6
at java.base@13-ea/jdk.internal.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.ForkJoinPool@4c10cdc6
at java.base@13-ea/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
at java.base@13-ea/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1633)
at java.base@13-ea/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

"ForkJoinPool.commonPool-worker-7" daemon prio=5 Id=783 WAITING on java.util.concurrent.ForkJoinPool@4c10cdc6
at java.base@13-ea/jdk.internal.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.ForkJoinPool@4c10cdc6
at java.base@13-ea/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
at java.base@13-ea/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1633)
at java.base@13-ea/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

"ForkJoinPool.commonPool-worker-11" daemon prio=5 Id=1527 WAITING on java.util.concurrent.ForkJoinPool@4c10cdc6
at java.base@13-ea/jdk.internal.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.ForkJoinPool@4c10cdc6
at java.base@13-ea/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
at java.base@13-ea/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1633)
at java.base@13-ea/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

"ForkJoinPool.commonPool-worker-9" daemon prio=5 Id=1528 WAITING on java.util.concurrent.ForkJoinPool@4c10cdc6
at java.base@13-ea/jdk.internal.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.ForkJoinPool@4c10cdc6
at java.base@13-ea/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
at java.base@13-ea/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1633)
at java.base@13-ea/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

"CompletableFutureDelayScheduler" daemon prio=5 Id=2042 TIMED_WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@427a2849
at java.base@13-ea/jdk.internal.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@427a2849
at java.base@13-ea/java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:235)
at java.base@13-ea/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2123)
at java.base@13-ea/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1182)
at java.base@13-ea/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:899)
at java.base@13-ea/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1054)
at java.base@13-ea/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1114)
at java.base@13-ea/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
...

"ForkJoinPool.commonPool-worker-13" daemon prio=5 Id=2164 TIMED_WAITING on java.util.concurrent.ForkJoinPool@4c10cdc6
at java.base@13-ea/jdk.internal.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.ForkJoinPool@4c10cdc6
at java.base@13-ea/java.util.concurrent.locks.LockSupport.parkUntil(LockSupport.java:276)
at java.base@13-ea/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1624)
at java.base@13-ea/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

"ForkJoinPool.commonPool-worker-15" daemon prio=5 Id=2561 WAITING on java.util.concurrent.ForkJoinPool@4c10cdc6
at java.base@13-ea/jdk.internal.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.ForkJoinPool@4c10cdc6
at java.base@13-ea/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
at java.base@13-ea/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1633)
at java.base@13-ea/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

"ForkJoinPool-313-worker-3" daemon prio=5 Id=2920 RUNNABLE
at java.management@13-ea/sun.management.ThreadImpl.dumpThreads0(Native Method)
at java.management@13-ea/sun.management.ThreadImpl.dumpAllThreads(ThreadImpl.java:502)
at java.management@13-ea/sun.management.ThreadImpl.dumpAllThreads(ThreadImpl.java:490)
at app//JSR166TestCase.dumpTestThreads(JSR166TestCase.java:1107)
at app//JSR166TestCase.threadRecordFailure(JSR166TestCase.java:769)
at app//JSR166TestCase.threadUnexpectedException(JSR166TestCase.java:955)
at app//JSR166TestCase$CheckedRecursiveAction.compute(JSR166TestCase.java:1687)
at java.base@13-ea/java.util.concurrent.RecursiveAction.exec(RecursiveAction.java:189)
...

"ForkJoinPool-313-worker-5" daemon prio=5 Id=2921 WAITING on java.util.concurrent.ForkJoinPool@103c5eaa
at java.base@13-ea/jdk.internal.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.ForkJoinPool@103c5eaa
at java.base@13-ea/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
at java.base@13-ea/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1635)
at java.base@13-ea/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

"ForkJoinPool-313-worker-7" daemon prio=5 Id=2922 WAITING on java.util.concurrent.ForkJoinPool@103c5eaa
at java.base@13-ea/jdk.internal.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.ForkJoinPool@103c5eaa
at java.base@13-ea/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
at java.base@13-ea/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1633)
at java.base@13-ea/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

"ForkJoinPool-313-worker-9" daemon prio=5 Id=2923 WAITING on java.util.concurrent.ForkJoinPool@103c5eaa
at java.base@13-ea/jdk.internal.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.ForkJoinPool@103c5eaa
at java.base@13-ea/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
at java.base@13-ea/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1633)
at java.base@13-ea/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

"ForkJoinPool-313-worker-11" daemon prio=5 Id=2924 WAITING on java.util.concurrent.ForkJoinPool@103c5eaa
at java.base@13-ea/jdk.internal.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.ForkJoinPool@103c5eaa
at java.base@13-ea/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
at java.base@13-ea/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1635)
at java.base@13-ea/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

"ForkJoinPool-313-worker-13" daemon prio=5 Id=2925 WAITING on java.util.concurrent.ForkJoinPool@103c5eaa
at java.base@13-ea/jdk.internal.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.ForkJoinPool@103c5eaa
at java.base@13-ea/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
at java.base@13-ea/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1635)
at java.base@13-ea/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

"ForkJoinPool-313-worker-15" daemon prio=5 Id=2926 WAITING on java.util.concurrent.ForkJoinPool@103c5eaa
at java.base@13-ea/jdk.internal.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.ForkJoinPool@103c5eaa
at java.base@13-ea/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
at java.base@13-ea/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1633)
at java.base@13-ea/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

"ForkJoinPool-313-worker-1" daemon prio=5 Id=2927 WAITING on java.util.concurrent.ForkJoinPool@103c5eaa
at java.base@13-ea/jdk.internal.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.ForkJoinPool@103c5eaa
at java.base@13-ea/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
at java.base@13-ea/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1633)
at java.base@13-ea/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

------ stacktrace dump end ------
junit.framework.AssertionFailedError: expected:<21> but was:<8>
at junit.framework.Assert.fail(Assert.java:50)
at junit.framework.Assert.failNotEquals(Assert.java:287)
at junit.framework.Assert.assertEquals(Assert.java:67)
at junit.framework.Assert.assertEquals(Assert.java:199)
at junit.framework.Assert.assertEquals(Assert.java:205)
at ForkJoinTask8Test$AsyncFib.checkCompletedNormally(ForkJoinTask8Test.java:365)
at ForkJoinTask8Test$8.realCompute(ForkJoinTask8Test.java:563)
at JSR166TestCase$CheckedRecursiveAction.compute(JSR166TestCase.java:1685)
at java.base/java.util.concurrent.RecursiveAction.exec(RecursiveAction.java:189)
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1016)
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1665)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1598)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)
JavaTest Message: JUnit Failure: testForkHelpQuiesce(ForkJoinTask8Test): null
junit.framework.AssertionFailedError
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
at java.base/java.util.concurrent.ForkJoinTask.getThrowableException(ForkJoinTask.java:603)
at java.base/java.util.concurrent.ForkJoinTask.reportException(ForkJoinTask.java:678)
at java.base/java.util.concurrent.ForkJoinTask.join(ForkJoinTask.java:722)
at java.base/java.util.concurrent.ForkJoinPool.invoke(ForkJoinPool.java:2432)
at ForkJoinTask8Test.testInvokeOnPool(ForkJoinTask8Test.java:110)
at ForkJoinTask8Test.testForkHelpQuiesce(ForkJoinTask8Test.java:565)
at ForkJoinTask8Test.testForkHelpQuiesce(ForkJoinTask8Test.java:551)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at junit.framework.TestCase.runTest(TestCase.java:168)
at JSR166TestCase.runTest(JSR166TestCase.java:369)
at junit.framework.TestCase.runBare(TestCase.java:134)
at JSR166TestCase.runBare(JSR166TestCase.java:360)
at junit.framework.TestResult$1.protect(TestResult.java:110)
at junit.framework.TestResult.runProtected(TestResult.java:128)
at junit.framework.TestResult.run(TestResult.java:113)
at junit.framework.TestCase.run(TestCase.java:124)
at junit.framework.TestSuite.runTest(TestSuite.java:243)
at junit.framework.TestSuite.run(TestSuite.java:238)
at junit.framework.TestSuite.runTest(TestSuite.java:243)
at junit.framework.TestSuite.run(TestSuite.java:238)
at junit.framework.TestSuite.runTest(TestSuite.java:243)
at junit.framework.TestSuite.run(TestSuite.java:238)
at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:24)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
at org.junit.runner.JUnitCore.run(JUnitCore.java:136)
at org.junit.runner.JUnitCore.run(JUnitCore.java:127)
at org.junit.runner.JUnitCore.runClasses(JUnitCore.java:76)
at com.sun.javatest.regtest.agent.JUnitRunner.main(JUnitRunner.java:76)
at com.sun.javatest.regtest.agent.JUnitRunner.main(JUnitRunner.java:43)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:830)
Caused by: junit.framework.AssertionFailedError: expected:<21> but was:<8>
at junit.framework.Assert.fail(Assert.java:50)
at junit.framework.Assert.failNotEquals(Assert.java:287)
at junit.framework.Assert.assertEquals(Assert.java:67)
at junit.framework.Assert.assertEquals(Assert.java:199)
at junit.framework.Assert.assertEquals(Assert.java:205)
at ForkJoinTask8Test$AsyncFib.checkCompletedNormally(ForkJoinTask8Test.java:365)
at ForkJoinTask8Test$8.realCompute(ForkJoinTask8Test.java:563)
at JSR166TestCase$CheckedRecursiveAction.compute(JSR166TestCase.java:1685)
at java.base/java.util.concurrent.RecursiveAction.exec(RecursiveAction.java:189)
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1016)
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1665)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1598)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

java.lang.Exception: JUnit test failure
at com.sun.javatest.regtest.agent.JUnitRunner.main(JUnitRunner.java:92)
at com.sun.javatest.regtest.agent.JUnitRunner.main(JUnitRunner.java:43)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:830)

JavaTest Message: Test threw exception: java.lang.Exception: JUnit test failure
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.Exception: JUnit test failure