New problem upgrading from 3.1.3 -> 3.1.4

[IanS]

After upgrading from 3.1.3 to 3.1.4, I'm having problems with recurring
exceptions:

2009-09-28 21:29:18,875: Unexpected exception from downstream for
channel=[id: 0x128256c2, /10.0.1.200:58766 => /10.0.1.200:8083]
java.nio.channels.ClosedChannelException
	at
org.jboss.netty.channel.socket.nio.NioWorker.cleanUpWriteBuffer(NioWorker.java:614)
	at
org.jboss.netty.channel.socket.nio.NioWorker.writeNow(NioWorker.java:451)
	at org.jboss.netty.channel.socket.nio.NioWorker.write(NioWorker.java:352)
	at
org.jboss.netty.channel.socket.nio.NioSocketChannel$WriteTask.run(NioSocketChannel.java:233)
	at
org.jboss.netty.channel.socket.nio.NioWorker.processWriteTaskQueue(NioWorker.java:264)
	at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:193)
	at
org.jboss.netty.util.internal.IoWorkerRunnable.run(IoWorkerRunnable.java:46)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:637)
2009-09-28 21:29:18,875: Unexpected exception from downstream for
channel=[id: 0x128256c2, /10.0.1.200:58766 => /10.0.1.200:8083]
java.nio.channels.ClosedChannelException
	at
org.jboss.netty.channel.socket.nio.NioWorker.cleanUpWriteBuffer(NioWorker.java:614)
	at
org.jboss.netty.channel.socket.nio.NioWorker.writeNow(NioWorker.java:451)
	at org.jboss.netty.channel.socket.nio.NioWorker.write(NioWorker.java:352)
	at
org.jboss.netty.channel.socket.nio.NioSocketChannel$WriteTask.run(NioSocketChannel.java:233)
	at
org.jboss.netty.channel.socket.nio.NioWorker.processWriteTaskQueue(NioWorker.java:264)
	at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:193)
	at
org.jboss.netty.util.internal.IoWorkerRunnable.run(IoWorkerRunnable.java:46)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:637)
2009-09-28 21:29:18,875: Unexpected exception from downstream for
channel=[id: 0x128256c2, /10.0.1.200:58766 => /10.0.1.200:8083]

This repeats indefinitely, and I am adding the logline to print the
exception and channel in exceptionCaught().  

This does not happen consistently in my testing, but once it happens, the
only way I can stop is to kill the process.  I also can't seem to reproduce
it in the debugger.  

This is on MacOSX 10.6 with JDK 1.5 FYI.  

-Ian
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