[jira] [Created] (LOG4J2-570) Memory Leak

["Scott (JIRA)" <ji...@apache.org>]

Scott created LOG4J2-570:
----------------------------

             Summary: Memory Leak
                 Key: LOG4J2-570
                 URL: https://issues.apache.org/jira/browse/LOG4J2-570
             Project: Log4j 2
          Issue Type: Bug
          Components: Core
    Affects Versions: 2.0-rc1
         Environment: Ubuntu 12.04
Linux bos-lpuv7 3.2.0-58-generic #88-Ubuntu SMP Tue Dec 3 17:37:58 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
8 GB RAM

java version "1.7.0_51"
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)

JAVA_OPTS=-Xmx1024m -Dsun.net.inetaddr.ttl=60 -Dsun.net.inetaddr.negative.ttl=60 -Djava.net.preferIPv4Stack=true -XX:PermSize=128m -XX:MaxPermSize=256m -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled

<log4j.version>2.0-rc1</log4j.version>
log4j-api
log4j-core
log4j-jcl

Spring webmvc 4.0.2.RELEASE application (simple hello world) deployed in tomcat7.0.52 container.

            Reporter: Scott
             Fix For: 2.0-rc2


The tomcat7 stop, undeploy, or redeploy actions on a WAR which utilizes log4j leaves creates a memory leak.  The memory leak is believed to be log4j for the following reasons:
1)Heap Dump reveals the classloader instance responsible for the WAR plugin (of type org.apache.catalina.loader.WebappClassLoader) has 2 non weak/soft reference which are of type (org.apache.logging.log4j.core.LoggerContext$ShutdownThread) and (org.apache.logging.log4j.core.jmx.LoggerContextAdmin) after the WAR has been stopped or undeployed.
2)Using the SLF4J NOP logger implementation all memory is gc as expected (the org.apache.catalina.loader.WebappClassLoader which loaded the WAR is no longer referenced by any hard references)

This may not be unique to 2.0rc-1 and I have seen similar behavior in previous 2.0 beta releases.

This is reproducible and I can provide more information if necessary.  I don't see anywhere to attach a heap dump, but a sequence of these and simple hello world source code can be supplied upon request.



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