Build: https://jenkins.thetaphi.de/job/Lucene-Solr-master-MacOSX/6744/
Java: 64bit/jdk-15 -XX:-UseCompressedOops -XX:+UseParallelGC

3 tests failed.
FAILED:  org.apache.solr.cloud.ZkFailoverTest.testRestartZkWhenClusterDown

Error Message:
java.lang.AssertionError: Timeout waiting for number of live nodes = 2

Stack Trace:
java.lang.AssertionError: Timeout waiting for number of live nodes = 2
        at 
__randomizedtesting.SeedInfo.seed([79836633EDF6991F:1714E57F94113F9C]:0)
        at org.junit.Assert.fail(Assert.java:89)
        at 
org.apache.solr.cloud.ZkFailoverTest.waitForLiveNodes(ZkFailoverTest.java:102)
        at 
org.apache.solr.cloud.ZkFailoverTest.testRestartZkWhenClusterDown(ZkFailoverTest.java:62)
        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
        at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:564)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1754)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner$8.evaluate(RandomizedRunner.java:942)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner$9.evaluate(RandomizedRunner.java:978)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner$10.evaluate(RandomizedRunner.java:992)
        at 
com.carrotsearch.randomizedtesting.rules.SystemPropertiesRestoreRule$1.evaluate(SystemPropertiesRestoreRule.java:57)
        at org.junit.rules.RunRules.evaluate(RunRules.java:20)
        at 
org.apache.lucene.util.TestRuleSetupTeardownChained$1.evaluate(TestRuleSetupTeardownChained.java:49)
        at 
org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:45)
        at 
org.apache.lucene.util.TestRuleThreadAndTestName$1.evaluate(TestRuleThreadAndTestName.java:48)
        at 
org.apache.lucene.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:64)
        at 
org.apache.lucene.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:47)
        at org.junit.rules.RunRules.evaluate(RunRules.java:20)
        at 
com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at 
com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:370)
        at 
com.carrotsearch.randomizedtesting.ThreadLeakControl.forkTimeoutingTask(ThreadLeakControl.java:819)
        at 
com.carrotsearch.randomizedtesting.ThreadLeakControl$3.evaluate(ThreadLeakControl.java:470)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner.runSingleTest(RandomizedRunner.java:951)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner$5.evaluate(RandomizedRunner.java:836)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner$6.evaluate(RandomizedRunner.java:887)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner$7.evaluate(RandomizedRunner.java:898)
        at 
com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at 
com.carrotsearch.randomizedtesting.rules.SystemPropertiesRestoreRule$1.evaluate(SystemPropertiesRestoreRule.java:57)
        at org.junit.rules.RunRules.evaluate(RunRules.java:20)
        at 
org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:45)
        at 
com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at 
org.apache.lucene.util.TestRuleStoreClassName$1.evaluate(TestRuleStoreClassName.java:41)
        at 
com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
        at 
com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
        at 
com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at 
com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at 
org.apache.lucene.util.TestRuleAssertionsRequired$1.evaluate(TestRuleAssertionsRequired.java:53)
        at 
org.apache.lucene.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:47)
        at 
org.apache.lucene.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:64)
        at 
org.apache.lucene.util.TestRuleIgnoreTestSuites$1.evaluate(TestRuleIgnoreTestSuites.java:54)
        at org.junit.rules.RunRules.evaluate(RunRules.java:20)
        at 
com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at 
com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:370)
        at 
com.carrotsearch.randomizedtesting.ThreadLeakControl.lambda$forkTimeoutingTask$0(ThreadLeakControl.java:826)
        at java.base/java.lang.Thread.run(Thread.java:832)


FAILED:  org.apache.solr.cloud.ZkFailoverTest.classMethod

Error Message:
com.carrotsearch.randomizedtesting.ThreadLeakError: 20 threads leaked from 
SUITE scope at org.apache.solr.cloud.ZkFailoverTest: 
   1) Thread[id=11434, name=SyncThread:0, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
app//org.apache.zookeeper.server.SyncRequestProcessor.run(SyncRequestProcessor.java:170)
   2) Thread[id=11441, name=NIOWorkerThread-5, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   3) Thread[id=11445, name=NIOWorkerThread-6, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   4) Thread[id=11448, name=NIOWorkerThread-8, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   5) Thread[id=11452, name=NIOWorkerThread-11, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   6) Thread[id=11429, name=NIOServerCxnFactory.SelectorThread-0, 
state=RUNNABLE, group=TGRP-ZkFailoverTest]
        at java.base@15/sun.nio.ch.KQueue.poll(Native Method)
        at 
java.base@15/sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:122)
        at 
java.base@15/sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:129)
        at java.base@15/sun.nio.ch.SelectorImpl.select(SelectorImpl.java:146)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory$SelectorThread.select(NIOServerCnxnFactory.java:417)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory$SelectorThread.run(NIOServerCnxnFactory.java:382)
   7) Thread[id=11446, name=NIOWorkerThread-7, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   8) Thread[id=11433, name=SessionTracker, state=TIMED_WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/java.lang.Thread.sleep(Native Method)
        at 
app//org.apache.zookeeper.server.SessionTrackerImpl.run(SessionTrackerImpl.java:157)
   9) Thread[id=11453, name=NIOWorkerThread-12, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  10) Thread[id=11440, name=NIOWorkerThread-4, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  11) Thread[id=11451, name=NIOWorkerThread-10, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  12) Thread[id=11436, name=RequestThrottler, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
app//org.apache.zookeeper.server.RequestThrottler.run(RequestThrottler.java:139)
  13) Thread[id=11432, name=NIOWorkerThread-2, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  14) Thread[id=11431, name=NIOWorkerThread-1, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  15) Thread[id=11435, name=ProcessThread(sid:0 cport:55693):, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
app//org.apache.zookeeper.server.PrepRequestProcessor.run(PrepRequestProcessor.java:140)
  16) Thread[id=11427, name=ZkTestServer Run Thread, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/java.lang.Object.wait(Native Method)
        at java.base@15/java.lang.Thread.join(Thread.java:1303)
        at java.base@15/java.lang.Thread.join(Thread.java:1371)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory.join(NIOServerCnxnFactory.java:929)
        at 
app//org.apache.solr.cloud.ZkTestServer$ZKServerMain.runFromConfig(ZkTestServer.java:347)
        at app//org.apache.solr.cloud.ZkTestServer$2.run(ZkTestServer.java:570)
  17) Thread[id=11449, name=NIOWorkerThread-9, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  18) Thread[id=11437, name=NIOWorkerThread-3, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  19) Thread[id=11430, 
name=NIOServerCxnFactory.AcceptThread:0.0.0.0/0.0.0.0:55693, state=RUNNABLE, 
group=TGRP-ZkFailoverTest]
        at java.base@15/sun.nio.ch.KQueue.poll(Native Method)
        at 
java.base@15/sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:122)
        at 
java.base@15/sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:129)
        at java.base@15/sun.nio.ch.SelectorImpl.select(SelectorImpl.java:146)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory$AcceptThread.select(NIOServerCnxnFactory.java:219)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory$AcceptThread.run(NIOServerCnxnFactory.java:195)
  20) Thread[id=11428, name=ConnnectionExpirer, state=TIMED_WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/java.lang.Thread.sleep(Native Method)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory$ConnectionExpirerThread.run(NIOServerCnxnFactory.java:568)

Stack Trace:
com.carrotsearch.randomizedtesting.ThreadLeakError: 20 threads leaked from 
SUITE scope at org.apache.solr.cloud.ZkFailoverTest: 
   1) Thread[id=11434, name=SyncThread:0, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
app//org.apache.zookeeper.server.SyncRequestProcessor.run(SyncRequestProcessor.java:170)
   2) Thread[id=11441, name=NIOWorkerThread-5, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   3) Thread[id=11445, name=NIOWorkerThread-6, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   4) Thread[id=11448, name=NIOWorkerThread-8, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   5) Thread[id=11452, name=NIOWorkerThread-11, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   6) Thread[id=11429, name=NIOServerCxnFactory.SelectorThread-0, 
state=RUNNABLE, group=TGRP-ZkFailoverTest]
        at java.base@15/sun.nio.ch.KQueue.poll(Native Method)
        at 
java.base@15/sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:122)
        at 
java.base@15/sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:129)
        at java.base@15/sun.nio.ch.SelectorImpl.select(SelectorImpl.java:146)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory$SelectorThread.select(NIOServerCnxnFactory.java:417)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory$SelectorThread.run(NIOServerCnxnFactory.java:382)
   7) Thread[id=11446, name=NIOWorkerThread-7, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   8) Thread[id=11433, name=SessionTracker, state=TIMED_WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/java.lang.Thread.sleep(Native Method)
        at 
app//org.apache.zookeeper.server.SessionTrackerImpl.run(SessionTrackerImpl.java:157)
   9) Thread[id=11453, name=NIOWorkerThread-12, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  10) Thread[id=11440, name=NIOWorkerThread-4, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  11) Thread[id=11451, name=NIOWorkerThread-10, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  12) Thread[id=11436, name=RequestThrottler, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
app//org.apache.zookeeper.server.RequestThrottler.run(RequestThrottler.java:139)
  13) Thread[id=11432, name=NIOWorkerThread-2, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  14) Thread[id=11431, name=NIOWorkerThread-1, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  15) Thread[id=11435, name=ProcessThread(sid:0 cport:55693):, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
app//org.apache.zookeeper.server.PrepRequestProcessor.run(PrepRequestProcessor.java:140)
  16) Thread[id=11427, name=ZkTestServer Run Thread, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/java.lang.Object.wait(Native Method)
        at java.base@15/java.lang.Thread.join(Thread.java:1303)
        at java.base@15/java.lang.Thread.join(Thread.java:1371)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory.join(NIOServerCnxnFactory.java:929)
        at 
app//org.apache.solr.cloud.ZkTestServer$ZKServerMain.runFromConfig(ZkTestServer.java:347)
        at app//org.apache.solr.cloud.ZkTestServer$2.run(ZkTestServer.java:570)
  17) Thread[id=11449, name=NIOWorkerThread-9, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  18) Thread[id=11437, name=NIOWorkerThread-3, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  19) Thread[id=11430, 
name=NIOServerCxnFactory.AcceptThread:0.0.0.0/0.0.0.0:55693, state=RUNNABLE, 
group=TGRP-ZkFailoverTest]
        at java.base@15/sun.nio.ch.KQueue.poll(Native Method)
        at 
java.base@15/sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:122)
        at 
java.base@15/sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:129)
        at java.base@15/sun.nio.ch.SelectorImpl.select(SelectorImpl.java:146)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory$AcceptThread.select(NIOServerCnxnFactory.java:219)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory$AcceptThread.run(NIOServerCnxnFactory.java:195)
  20) Thread[id=11428, name=ConnnectionExpirer, state=TIMED_WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/java.lang.Thread.sleep(Native Method)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory$ConnectionExpirerThread.run(NIOServerCnxnFactory.java:568)
        at __randomizedtesting.SeedInfo.seed([79836633EDF6991F]:0)


FAILED:  org.apache.solr.cloud.ZkFailoverTest.classMethod

Error Message:
com.carrotsearch.randomizedtesting.ThreadLeakError: There are still zombie 
threads that couldn't be terminated:
   1) Thread[id=11440, name=NIOWorkerThread-4, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   2) Thread[id=11451, name=NIOWorkerThread-10, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   3) Thread[id=11432, name=NIOWorkerThread-2, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   4) Thread[id=11441, name=NIOWorkerThread-5, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   5) Thread[id=11445, name=NIOWorkerThread-6, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   6) Thread[id=11448, name=NIOWorkerThread-8, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   7) Thread[id=11431, name=NIOWorkerThread-1, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   8) Thread[id=11452, name=NIOWorkerThread-11, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   9) Thread[id=11429, name=NIOServerCxnFactory.SelectorThread-0, 
state=RUNNABLE, group=TGRP-ZkFailoverTest]
        at java.base@15/sun.nio.ch.IOUtil.write1(Native Method)
        at 
java.base@15/sun.nio.ch.KQueueSelectorImpl.wakeup(KQueueSelectorImpl.java:293)
        at 
java.base@15/java.nio.channels.spi.AbstractSelector$1.interrupt(AbstractSelector.java:230)
        at 
java.base@15/java.nio.channels.spi.AbstractSelector.begin(AbstractSelector.java:236)
        at java.base@15/sun.nio.ch.SelectorImpl.begin(SelectorImpl.java:99)
        at 
java.base@15/sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:118)
        at 
java.base@15/sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:129)
        at java.base@15/sun.nio.ch.SelectorImpl.select(SelectorImpl.java:146)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory$SelectorThread.select(NIOServerCnxnFactory.java:417)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory$SelectorThread.run(NIOServerCnxnFactory.java:382)
  10) Thread[id=11449, name=NIOWorkerThread-9, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  11) Thread[id=11437, name=NIOWorkerThread-3, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  12) Thread[id=11446, name=NIOWorkerThread-7, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  13) Thread[id=11453, name=NIOWorkerThread-12, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  14) Thread[id=11430, 
name=NIOServerCxnFactory.AcceptThread:0.0.0.0/0.0.0.0:55693, state=RUNNABLE, 
group=TGRP-ZkFailoverTest]
        at java.base@15/sun.nio.ch.IOUtil.write1(Native Method)
        at 
java.base@15/sun.nio.ch.KQueueSelectorImpl.wakeup(KQueueSelectorImpl.java:293)
        at 
java.base@15/java.nio.channels.spi.AbstractSelector$1.interrupt(AbstractSelector.java:230)
        at 
java.base@15/java.nio.channels.spi.AbstractSelector.begin(AbstractSelector.java:236)
        at java.base@15/sun.nio.ch.SelectorImpl.begin(SelectorImpl.java:99)
        at 
java.base@15/sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:118)
        at 
java.base@15/sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:129)
        at java.base@15/sun.nio.ch.SelectorImpl.select(SelectorImpl.java:146)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory$AcceptThread.select(NIOServerCnxnFactory.java:219)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory$AcceptThread.run(NIOServerCnxnFactory.java:195)

Stack Trace:
com.carrotsearch.randomizedtesting.ThreadLeakError: There are still zombie 
threads that couldn't be terminated:
   1) Thread[id=11440, name=NIOWorkerThread-4, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   2) Thread[id=11451, name=NIOWorkerThread-10, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   3) Thread[id=11432, name=NIOWorkerThread-2, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   4) Thread[id=11441, name=NIOWorkerThread-5, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   5) Thread[id=11445, name=NIOWorkerThread-6, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   6) Thread[id=11448, name=NIOWorkerThread-8, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   7) Thread[id=11431, name=NIOWorkerThread-1, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   8) Thread[id=11452, name=NIOWorkerThread-11, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
   9) Thread[id=11429, name=NIOServerCxnFactory.SelectorThread-0, 
state=RUNNABLE, group=TGRP-ZkFailoverTest]
        at java.base@15/sun.nio.ch.IOUtil.write1(Native Method)
        at 
java.base@15/sun.nio.ch.KQueueSelectorImpl.wakeup(KQueueSelectorImpl.java:293)
        at 
java.base@15/java.nio.channels.spi.AbstractSelector$1.interrupt(AbstractSelector.java:230)
        at 
java.base@15/java.nio.channels.spi.AbstractSelector.begin(AbstractSelector.java:236)
        at java.base@15/sun.nio.ch.SelectorImpl.begin(SelectorImpl.java:99)
        at 
java.base@15/sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:118)
        at 
java.base@15/sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:129)
        at java.base@15/sun.nio.ch.SelectorImpl.select(SelectorImpl.java:146)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory$SelectorThread.select(NIOServerCnxnFactory.java:417)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory$SelectorThread.run(NIOServerCnxnFactory.java:382)
  10) Thread[id=11449, name=NIOWorkerThread-9, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  11) Thread[id=11437, name=NIOWorkerThread-3, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  12) Thread[id=11446, name=NIOWorkerThread-7, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  13) Thread[id=11453, name=NIOWorkerThread-12, state=WAITING, 
group=TGRP-ZkFailoverTest]
        at java.base@15/jdk.internal.misc.Unsafe.park(Native Method)
        at 
java.base@15/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
        at 
java.base@15/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
        at 
java.base@15/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
        at 
java.base@15/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
        at 
java.base@15/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base@15/java.lang.Thread.run(Thread.java:832)
  14) Thread[id=11430, 
name=NIOServerCxnFactory.AcceptThread:0.0.0.0/0.0.0.0:55693, state=RUNNABLE, 
group=TGRP-ZkFailoverTest]
        at java.base@15/sun.nio.ch.IOUtil.write1(Native Method)
        at 
java.base@15/sun.nio.ch.KQueueSelectorImpl.wakeup(KQueueSelectorImpl.java:293)
        at 
java.base@15/java.nio.channels.spi.AbstractSelector$1.interrupt(AbstractSelector.java:230)
        at 
java.base@15/java.nio.channels.spi.AbstractSelector.begin(AbstractSelector.java:236)
        at java.base@15/sun.nio.ch.SelectorImpl.begin(SelectorImpl.java:99)
        at 
java.base@15/sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:118)
        at 
java.base@15/sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:129)
        at java.base@15/sun.nio.ch.SelectorImpl.select(SelectorImpl.java:146)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory$AcceptThread.select(NIOServerCnxnFactory.java:219)
        at 
app//org.apache.zookeeper.server.NIOServerCnxnFactory$AcceptThread.run(NIOServerCnxnFactory.java:195)
        at __randomizedtesting.SeedInfo.seed([79836633EDF6991F]:0)
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