[LOG4J2-1259] Log4j threads are leaking on Tomcat shutdown

• Type: Bug
• Status: Reopened
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.5
• Component/s: Appenders
• Assignee: Unassigned
• Reporter: Misagh Moayyed
• Created: 20/Jan/16 21:59
• Updated: 06/Sep/17 15:29

Description

Running log4j2 v2.5 with disruptor 3.3.x. AsyncLoggers configured. log4j-web also included in the web application deployed in Tomcat 8. The context listener is correctly starting up and shutting down, catalina.properties does not include the log4j*.jar entry. Yet I see:

20-Jan-2016 14:59:26.322 WARNING [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [cas-server-webapp-4.3.0-SNAPSHOT] appears to have started a thread named [Log4j2-Log4j2Scheduled-5] 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.parkNanos(LockSupport.java:215)
 java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
 java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
 java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
 java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
 java.lang.Thread.run(Thread.java:745)
20-Jan-2016 14:59:26.336 WARNING [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [cas-server-webapp-4.3.0-SNAPSHOT] appears to have started a thread named [Log4j2-AsyncLoggerConfig-6] 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$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
 com.lmax.disruptor.BlockingWaitStrategy.waitFor(BlockingWaitStrategy.java:45)
 com.lmax.disruptor.ProcessingSequenceBarrier.waitFor(ProcessingSequenceBarrier.java:56)
 com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:124)
 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
 java.lang.Thread.run(Thread.java:745)

Issue Links

• relates to: LOG4J2-1419 Memory leak on Tomcat shutdown
• relates to: LOG4J2-1573 Layout is no longer optional