I'm pretty sure this is a concurrency bug somewhere because the test hits
this assertion:
if (ms instanceof ConcurrentMergeScheduler) {
assertEquals(0, ((ConcurrentMergeScheduler) ms).mergeThreadCount());
}
with merge threads somehow still running; it then closes the directories
and this results in multiple uncaught exceptions in merge threads (in the
full log from that build):
org.apache.lucene.store.AlreadyClosedException: Lock instance
already released:
org.apache.lucene.store.SingleInstanceLockFactory$SingleInstanceLock@173e491:
write.lock
at
app//org.apache.lucene.store.SingleInstanceLockFactory$SingleInstanceLock.ensureValid(SingleInstanceLockFactory.java:56)
at
app//org.apache.lucene.store.LockValidatingDirectoryWrapper.createOutput(LockValidatingDirectoryWrapper.java:42)
at
app//org.apache.lucene.index.ConcurrentMergeScheduler$1.createOutput(ConcurrentMergeScheduler.java:308)
at
app//org.apache.lucene.store.TrackingDirectoryWrapper.createOutput(TrackingDirectoryWrapper.java:41)
at
app//org.apache.lucene.codecs.lucene90.compressing.Lucene90CompressingStoredFieldsWriter.<init>(Lucene90CompressingStoredFieldsWriter.java:129)
at
app//org.apache.lucene.codecs.lucene90.compressing.Lucene90CompressingStoredFieldsFormat.fieldsWriter(Lucene90CompressingStoredFieldsFormat.java:140)
at
app//org.apache.lucene.codecs.lucene90.Lucene90StoredFieldsFormat.fieldsWriter(Lucene90StoredFieldsFormat.java:154)
at
app//org.apache.lucene.tests.codecs.asserting.AssertingStoredFieldsFormat.fieldsWriter(AssertingStoredFieldsFormat.java:49)
at
app//org.apache.lucene.index.SegmentMerger.mergeFields(SegmentMerger.java:248)
at
app//org.apache.lucene.index.SegmentMerger.mergeWithLogging(SegmentMerger.java:290)
at
app//org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:120)
at
app//org.apache.lucene.index.IndexWriter.addIndexesReaderMerge(IndexWriter.java:3467)
at
app//org.apache.lucene.index.IndexWriter$AddIndexesMergeSource.merge(IndexWriter.java:3349)
at
app//org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:661)
at
app//org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:720)
No matter how hard I tried (by injecting custom sleeps), I couldn't
reproduce this effect or thread ordering though. Frustrating.
Dawid
On Sat, Nov 15, 2025 at 7:42 PM Policeman Jenkins Server <
[email protected]> wrote:
> Build: https://jenkins.thetaphi.de/job/Lucene-main-Windows/17565/
> Java: 64bit/hotspot/jdk-25 -XX:+UseCompressedOops -XX:+UseSerialGC
>
> 1 tests failed.
> FAILED: org.apache.lucene.index.TestAddIndexes.testAddIndexesWithRollback
>
> Error Message:
> java.lang.AssertionError: expected:<0> but was:<5>
>
> Stack Trace:
> java.lang.AssertionError: expected:<0> but was:<5>
> at org.junit.Assert.fail(Assert.java:89)
> at org.junit.Assert.failNotEquals(Assert.java:835)
> at org.junit.Assert.assertEquals(Assert.java:647)
> at org.junit.Assert.assertEquals(Assert.java:633)
> at
> org.apache.lucene.index.TestAddIndexes.testAddIndexesWithRollback(TestAddIndexes.java:1302)
> at
> java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
> at java.base/java.lang.reflect.Method.invoke(Method.java:565)
> at
> com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1763)
> at
> com.carrotsearch.randomizedtesting.RandomizedRunner$8.evaluate(RandomizedRunner.java:946)
> at
> com.carrotsearch.randomizedtesting.RandomizedRunner$9.evaluate(RandomizedRunner.java:982)
> at
> com.carrotsearch.randomizedtesting.RandomizedRunner$10.evaluate(RandomizedRunner.java:996)
> at
> org.apache.lucene.tests.util.TestRuleSetupTeardownChained$1.evaluate(TestRuleSetupTeardownChained.java:48)
> at
> org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
> at
> org.apache.lucene.tests.util.TestRuleThreadAndTestName$1.evaluate(TestRuleThreadAndTestName.java:45)
> at
> org.apache.lucene.tests.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:60)
> at
> org.apache.lucene.tests.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:44)
> at org.junit.rules.RunRules.evaluate(RunRules.java:20)
> at
> com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
> at
> com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:390)
> at
> com.carrotsearch.randomizedtesting.ThreadLeakControl.forkTimeoutingTask(ThreadLeakControl.java:843)
> at
> com.carrotsearch.randomizedtesting.ThreadLeakControl$3.evaluate(ThreadLeakControl.java:490)
> at
> com.carrotsearch.randomizedtesting.RandomizedRunner.runSingleTest(RandomizedRunner.java:955)
> at
> com.carrotsearch.randomizedtesting.RandomizedRunner$5.evaluate(RandomizedRunner.java:840)
> at
> com.carrotsearch.randomizedtesting.RandomizedRunner$6.evaluate(RandomizedRunner.java:891)
> at
> com.carrotsearch.randomizedtesting.RandomizedRunner$7.evaluate(RandomizedRunner.java:902)
> at
> org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
> at
> com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
> at
> org.apache.lucene.tests.util.TestRuleStoreClassName$1.evaluate(TestRuleStoreClassName.java:38)
> 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.tests.util.TestRuleAssertionsRequired$1.evaluate(TestRuleAssertionsRequired.java:52)
> at
> org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
> at
> org.apache.lucene.tests.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:44)
> at
> org.apache.lucene.tests.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:60)
> at
> org.apache.lucene.tests.util.TestRuleIgnoreTestSuites$1.evaluate(TestRuleIgnoreTestSuites.java:47)
> at org.junit.rules.RunRules.evaluate(RunRules.java:20)
> at
> com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
> at
> com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:390)
> at
> com.carrotsearch.randomizedtesting.ThreadLeakControl.lambda$forkTimeoutingTask$0(ThreadLeakControl.java:850)
> at java.base/java.lang.Thread.run(Thread.java:1474)
>
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