Robin Jansohn created LOG4J2-1159:
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Summary: 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: 2.4.1, 2.4
Reporter: Robin Jansohn
Priority: Minor
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.
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