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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 42585] New: - SocketNode can leak Sockets
Date Tue, 05 Jun 2007 12:08:10 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=42585

           Summary: SocketNode can leak Sockets
           Product: Log4j
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: Other
        AssignedTo: log4j-dev@logging.apache.org
        ReportedBy: odi@odi.ch


We had an issue when the SocketNode thread died with an OOM exception. The
socket is not closed in this case. The sending SocketAppender doesn't notice and
blocks indefinitely in SocketOutputStream.write. Due to the locks held on the
appender this causes the whole application to block.

One solution should be to close the the socket in a finally block. Of course we
are also adding size checks to the problematic log statement plus increasing the
heap size of the logserver.

"Dispatcher-Thread-3" daemon prio=1 tid=0x5b6b6120 nid=0x6c8e runnable
[0x5b16f000..0x5b16f770]
	at java.net.SocketOutputStream.socketWrite0(Native Method)
	at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
	at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
	at
java.io.ObjectOutputStream$BlockDataOutputStream.drain(ObjectOutputStream.java:1682)
	at
java.io.ObjectOutputStream$BlockDataOutputStream.setBlockDataMode(ObjectOutputStream.java:1591)
	at java.io.ObjectOutputStream.writeNonProxyDesc(ObjectOutputStream.java:1173)
	at java.io.ObjectOutputStream.writeClassDesc(ObjectOutputStream.java:1127)
	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1284)
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:302)
	at org.apache.log4j.net.SocketAppender.append(SocketAppender.java:224)
	at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:221)
	- locked <0x66a9c690> (a org.apache.log4j.net.SocketAppender)
	at
org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:57)
	at org.apache.log4j.Dispatcher.run(AsyncAppender.java:310)
	- locked <0x66a9a060> (a org.apache.log4j.helpers.AppenderAttachableImpl)

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