Robert Muir created LUCENE-6518:
-----------------------------------
Summary: "classcache reaper" needs exemption from thread leaks
Key: LUCENE-6518
URL: https://issues.apache.org/jira/browse/LUCENE-6518
Project: Lucene - Core
Issue Type: Bug
Reporter: Robert Muir
This happens on IBM JDK (some system thread or what have you).
its 100% reproducible if you just cd lucene/analysis/smartcn and run 'ant
test': we time out waiting for the thread to die and fail like this:
{noformat}
[junit4] Suite:
org.apache.lucene.analysis.cn.smart.TestHMMChineseTokenizerFactory
[junit4] 2> Jun 03, 2015 12:30:39 PM
com.carrotsearch.randomizedtesting.ThreadLeakControl checkThreadLeaks
[junit4] 2> WARNING: Will linger awaiting termination of 1 leaked
thread(s).
[junit4] 2> Jun 03, 2015 12:30:59 PM
com.carrotsearch.randomizedtesting.ThreadLeakControl checkThreadLeaks
[junit4] 2> SEVERE: 1 thread leaked from SUITE scope at
org.apache.lucene.analysis.cn.smart.TestHMMChineseTokenizerFactory:
[junit4] 2> 1) Thread[id=27, name=ClassCache Reaper, state=WAITING,
group=TGRP-TestHMMChineseTokenizerFactory]
[junit4] 2> at java.lang.Object.wait(Native Method)
[junit4] 2> at java.lang.Object.wait(Object.java:201)
[junit4] 2> at
java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:119)
[junit4] 2> at
java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:91)
[junit4] 2> at java.io.ClassCache$Reaper.run(ClassCache.java:222)
[junit4] 2> Jun 03, 2015 12:30:59 PM
com.carrotsearch.randomizedtesting.ThreadLeakControl tryToInterruptAll
[junit4] 2> INFO: Starting to interrupt leaked threads:
[junit4] 2> 1) Thread[id=27, name=ClassCache Reaper, state=WAITING,
group=TGRP-TestHMMChineseTokenizerFactory]
[junit4] 2> Jun 03, 2015 12:31:02 PM
com.carrotsearch.randomizedtesting.ThreadLeakControl tryToInterruptAll
[junit4] 2> SEVERE: There are still zombie threads that couldn't be
terminated:
[junit4] 2> 1) Thread[id=27, name=ClassCache Reaper, state=WAITING,
group=TGRP-TestHMMChineseTokenizerFactory]
[junit4] 2> at java.lang.Object.wait(Native Method)
[junit4] 2> at java.lang.Object.wait(Object.java:201)
[junit4] 2> at
java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:119)
[junit4] 2> at
java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:91)
[junit4] 2> at java.io.ClassCache$Reaper.run(ClassCache.java:222)
[junit4] 2> NOTE: test params are: codec=Asserting(Lucene50): {},
docValues:{}, sim=RandomSimilarityProvider(queryNorm=true,coord=no): {},
locale=ar_JO, timezone=Europe/Andorra
[junit4] 2> NOTE: Linux 3.13.0-49-generic amd64/IBM Corporation 1.8.0
(64-bit)/cpus=8,threads=2,free=1204464,total=20643840
[junit4] 2> NOTE: All tests run in this JVM:
[TestHMMChineseTokenizerFactory]
[junit4] 2> NOTE: reproduce with: ant test
-Dtestcase=TestHMMChineseTokenizerFactory -Dtests.seed=4546D15E2A47A285
-Dtests.locale=ar_JO -Dtests.timezone=Europe/Andorra -Dtests.asserts=true
-Dtests.file.encoding=UTF-8
{noformat}
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