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From "Remko Popma (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LOG4J2-1159) ThreadLocal leaks in Tomcat8 (org.apache.logging.log4j.core.async.AsyncLogger.Info)
Date Sun, 18 Oct 2015 15:24:06 GMT

     [ https://issues.apache.org/jira/browse/LOG4J2-1159?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Remko Popma updated LOG4J2-1159:
--------------------------------
    Fix Version/s: 2.5

> ThreadLocal leaks in Tomcat8 (org.apache.logging.log4j.core.async.AsyncLogger.Info)
> -----------------------------------------------------------------------------------
>
>                 Key: LOG4J2-1159
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1159
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.4, 2.4.1
>            Reporter: Robin Jansohn
>            Priority: Minor
>             Fix For: 2.5
>
>
> Since v2.4 there a TreadLocal warnings reported by Tomcat. A minimal webapp to reproduce
can be found here: https://github.com/jansohn/log4j2-threadlocal
> {noformat}
> WARNUNG: The web application [log4j2webapp] appears to have started a thread named [AsyncLogger-1]
but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
>  sun.misc.Unsafe.park(Native Method)
>  java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
>  java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
>  com.lmax.disruptor.BlockingWaitStrategy.waitFor(BlockingWaitStrategy.java:45)
>  com.lmax.disruptor.ProcessingSequenceBarrier.waitFor(ProcessingSequenceBarrier.java:55)
>  com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:123)
>  java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>  java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>  java.lang.Thread.run(Thread.java:745)
> Okt 14, 2015 1:06:48 PM org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
> SCHWERWIEGEND: The web application [log4j2webapp] created a ThreadLocal with key of type
[org.apache.logging.log4j.core.async.AsyncLogger$Info$1] (value [org.apache.logging.log4j.core.async.AsyncLogger$Info$1@1d29f54])
and a value of type [org.apache.logging.log4j.core.async.AsyncLogger.Info] (value [org.apache.logging.log4j.core.async.AsyncLogger$Info@1ea59ba])
but failed to remove it when the web application was stopped. Threads are going to be renewed
over time to try and avoid a probable memory leak.
> {noformat}



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