[JBoss JIRA] Created: (NETTY-310) Memory leak in netty-3.2.0.BETA1.jar

[Benoit Sigoure (JIRA)]

Memory leak in netty-3.2.0.BETA1.jar
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                 Key: NETTY-310
                 URL: https://jira.jboss.org/jira/browse/NETTY-310
             Project: Netty
          Issue Type: Bug
    Affects Versions: 3.2.0.BETA1
         Environment: $ uname -a
Darwin hactar.local 10.3.0 Darwin Kernel Version 10.3.0: Fri Feb 26 11:58:09 PST 2010; root:xnu-1504.3.12~1/RELEASE_I386 i386
$ javac -version
javac 1.6.0_17
$ java -version
java version "1.6.0_17"
Java(TM) SE Runtime Environment (build 1.6.0_17-b04-248-10M3025)
Java HotSpot(TM) 64-Bit Server VM (build 14.3-b01-101, mixed mode)
            Reporter: Benoit Sigoure
            Assignee: Trustin Lee
            Priority: Blocker


I'm currently writing an application against 3.2.0.BETA1 that kept dying with {{OutOfMemoryError}}.  The heap contained a very large number of objects owned by Netty ({{DefaultChannelFuture}}, {{LinkedTransferQueue$Node}}, {{DownstreamMessageEvent}}, {{BigEndianHeapChannelBuffer}}).  After being puzzled for a while, I backported it against 3.1.5.GA and the leak disappeared.  I couldn't reproduce the problem so instead I trimed down my code as much as I could and ended up with 110 lines in 4 classes, using no external dependencies other than Netty and the JDK.  When compiled and run against 3.1.5.GA, the heap size remains mostly constant.  When compiled and run against 3.2.0.BETA1, the heap keeps growing until the JVM is struggling, doing full GCs all the time.

I'm going to attach the code and GC log to this issue.

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