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https://issues.apache.org/jira/browse/LOG4J2-1259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15466627#comment-15466627
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Steffen Offermann edited comment on LOG4J2-1259 at 9/6/16 8:10 AM:
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I was able to do a local build, and the result was:
- Before undeploying the web application:
{noformat}
Thread Name Thread State Blocked Count Blocked Time Waited Count
Waited Time Total CPU Usage(%) Deadlocked Lock Name Lock
Owner ID Lock Owner Name Thread Id Native Suspended Allocated
Bytes(bytes)
Log4j2-TF-4-AsyncLoggerConfig-2 TIMED_WAITING 102 893
-45,623,600 Not Enabled
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@5118f78a
37 0 0 -256,236
Log4j2-TF-3-Scheduled-1 TIMED_WAITING 0 1
-45,623,600 Not Enabled
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@31d99db5
36 0 0 -256,236
{noformat}
- After undeploying the web application:
{noformat}
Thread Name Thread State Blocked Count Blocked Time Waited Count
Waited Time Total CPU Usage(%) Deadlocked Lock Name Lock
Owner ID Lock Owner Name Thread Id Native Suspended Allocated
Bytes(bytes)
Log4j2-TF-3-Scheduled-1 TIMED_WAITING 0 2
-45,623,600 Not Enabled
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@31d99db5
36 0 0 -256,236
{noformat}
- After redeploying the web application:
{noformat}
Thread Name Thread State Blocked Count Blocked Time Waited Count
Waited Time Total CPU Usage(%) Deadlocked Lock Name Lock
Owner ID Lock Owner Name Thread Id Native Suspended Allocated
Bytes(bytes)
Log4j2-TF-4-AsyncLoggerConfig-2 TIMED_WAITING 96 676
-45,623,600 Not Enabled
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@7d134f0b
69 0 0 -256,236
Log4j2-TF-3-Scheduled-1 TIMED_WAITING 0 1
-45,623,600 Not Enabled
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@5536ad8b
68 0 0 -256,236
Log4j2-TF-3-Scheduled-1 TIMED_WAITING 0 2
-45,623,600 Not Enabled
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@31d99db5
36 0 0 -256,236
{noformat}
- After undeploying it again:
{noformat}
Thread Name Thread State Blocked Count Blocked Time Waited Count
Waited Time Total CPU Usage(%) Deadlocked Lock Name Lock
Owner ID Lock Owner Name Thread Id Native Suspended Allocated
Bytes(bytes)
Log4j2-TF-3-Scheduled-1 TIMED_WAITING 0 2
-45,623,600 Not Enabled
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@5536ad8b
68 0 0 -256,236
Log4j2-TF-3-Scheduled-1 TIMED_WAITING 0 2
-45,623,600 Not Enabled
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@31d99db5
36 0 0 -256,236
{noformat}
I.e. one thread remains active with every deployment/undeployment. I had
managed to get that far with v2.6.2, too, in the meantime.
was (Author: steffeno):
I was able to do a local build, and the result was:
- Before undeploying the web application:
{noformat}
Thread Name Thread State Blocked Count Blocked Time Waited Count
Waited Time Total CPU Usage(%) Deadlocked Lock Name Lock
Owner ID Lock Owner Name Thread Id Native Suspended Allocated
Bytes(bytes)
Log4j2-TF-4-AsyncLoggerConfig-2 TIMED_WAITING 102 893
-45,623,600 Not Enabled
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@5118f78a
37 0 0 -256,236
Log4j2-TF-3-Scheduled-1 TIMED_WAITING 0 1
-45,623,600 Not Enabled
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@31d99db5
36 0 0 -256,236
{noformat}
- After undeploying the web application:
{noformat}
Thread Name Thread State Blocked Count Blocked Time Waited Count
Waited Time Total CPU Usage(%) Deadlocked Lock Name Lock
Owner ID Lock Owner Name Thread Id Native Suspended Allocated
Bytes(bytes)
Log4j2-TF-3-Scheduled-1 TIMED_WAITING 0 2
-45,623,600 Not Enabled
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@31d99db5
36 0 0 -256,236
{noformat}
- After redeploying the web application:
{noformat}
Thread Name Thread State Blocked Count Blocked Time Waited Count
Waited Time Total CPU Usage(%) Deadlocked Lock Name Lock
Owner ID Lock Owner Name Thread Id Native Suspended Allocated
Bytes(bytes)
Log4j2-TF-4-AsyncLoggerConfig-2 TIMED_WAITING 96 676
-45,623,600 Not Enabled
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@7d134f0b
69 0 0 -256,236
Log4j2-TF-3-Scheduled-1 TIMED_WAITING 0 1
-45,623,600 Not Enabled
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@5536ad8b
68 0 0 -256,236
Log4j2-TF-3-Scheduled-1 TIMED_WAITING 0 2
-45,623,600 Not Enabled
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@31d99db5
36 0 0 -256,236
{noformat}
- After undeploying it again:
{noformat}
Thread Name Thread State Blocked Count Blocked Time Waited Count
Waited Time Total CPU Usage(%) Deadlocked Lock Name Lock
Owner ID Lock Owner Name Thread Id Native Suspended Allocated
Bytes(bytes)
Log4j2-TF-3-Scheduled-1 TIMED_WAITING 0 2
-45,623,600 Not Enabled
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@5536ad8b
68 0 0 -256,236
Log4j2-TF-3-Scheduled-1 TIMED_WAITING 0 2
-45,623,600 Not Enabled
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@31d99db5
36 0 0 -256,236
{noformat}
I.e. one remains active with every deployment/undeployment. I had managed to
get that far with v2.6.2, too, in the meantime.
> Log4j threads are leaking on tomcat shutdown
> --------------------------------------------
>
> Key: LOG4J2-1259
> URL: https://issues.apache.org/jira/browse/LOG4J2-1259
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.5
> Reporter: Misagh Moayyed
>
> 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:
> {code}
> 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)
> {code}
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