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[CI] ConcurrentModificationException in DequeRecycler.close #41683

@davidkyle

Description

@davidkyle

The error happened in the afterClass method in IPHostnameVerificationTests, I doubt it is related to the test

java.util.ConcurrentModificationException
	at __randomizedtesting.SeedInfo.seed([26CFB3C362D0C58B]:0)
	at java.base/java.util.ArrayDeque.nonNullElementAt(ArrayDeque.java:271)
	at java.base/java.util.ArrayDeque$DeqIterator.next(ArrayDeque.java:701)
	at org.elasticsearch.common.recycler.DequeRecycler.close(DequeRecycler.java:42)
	at org.elasticsearch.common.recycler.FilterRecycler.close(FilterRecycler.java:39)
	at org.elasticsearch.core.internal.io.IOUtils.close(IOUtils.java:103)
	at org.elasticsearch.core.internal.io.IOUtils.close(IOUtils.java:85)
	at org.elasticsearch.common.lease.Releasables.close(Releasables.java:36)
	at org.elasticsearch.common.lease.Releasables.close(Releasables.java:46)
	at org.elasticsearch.common.lease.Releasables.close(Releasables.java:67)
	at org.elasticsearch.common.lease.Releasables.close(Releasables.java:75)
	at org.elasticsearch.common.util.PageCacheRecycler.close(PageCacheRecycler.java:78)
	at org.elasticsearch.core.internal.io.IOUtils.close(IOUtils.java:103)
	at org.elasticsearch.core.internal.io.IOUtils.close(IOUtils.java:85)
	at org.elasticsearch.node.Node.close(Node.java:852)
	at org.elasticsearch.test.InternalTestCluster$NodeAndClient.close(InternalTestCluster.java:995)
	at org.elasticsearch.core.internal.io.IOUtils.close(IOUtils.java:103)
	at org.elasticsearch.core.internal.io.IOUtils.close(IOUtils.java:85)
	at org.elasticsearch.test.InternalTestCluster.close(InternalTestCluster.java:816)
	at org.elasticsearch.core.internal.io.IOUtils.close(IOUtils.java:103)
	at org.elasticsearch.core.internal.io.IOUtils.close(IOUtils.java:85)
	at org.elasticsearch.test.ESIntegTestCase.clearClusters(ESIntegTestCase.java:541)
	at org.elasticsearch.test.ESIntegTestCase.afterClass(ESIntegTestCase.java:2184)
	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:566)
	at com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1750)
	at com.carrotsearch.randomizedtesting.RandomizedRunner$7.evaluate(RandomizedRunner.java:901)
	at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
	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$1.evaluate(TestRuleIgnoreTestSuites.java:54)
	at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
	at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:368)
	at java.base/java.lang.Thread.run(Thread.java:834)

https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+master+multijob-unix-compatibility/os=ubuntu-18.04&&immutable/364/console

Does not reproduce and not a lot to work with sorry

./gradlew :x-pack:plugin:security:test --tests "org.elasticsearch.xpack.security.transport.netty4.IPHostnameVerificationTests.null" \
  -Dtests.seed=26CFB3C362D0C58B \
  -Dtests.security.manager=true \
  -Dtests.locale=en-US \
  -Dtests.timezone=Etc/UTC \
  -Dcompiler.java=12 \
  -Druntime.java=11

Note the repo command lists the test IPHostnameVerificationTests.null, null is not a test this must be a result of the failure occurring in the after class method

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