Hanging when calling NioServerSocketChannelFactory.releaseExternalResources()

[aspen264]

I am sure that I am not in a netty thread when I do this.  I see this happen
running JUnits tests.  After running the tests several times successfully,
one test in particular will start to hang.  It seems that a netty server
thread does not terminate.  Here is the top part of the stacktrace from a
thread dump.  Any Ideas?:

main at 1, prio=5, in group 'main', status: 'waiting'
  java.lang.Thread.State: WAITING
	  at sun.misc.Unsafe.park(Unsafe.java:-1)
	  at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:198)
	  at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:1963)
	  at
java.util.concurrent.ThreadPoolExecutor.awaitTermination(ThreadPoolExecutor.java:1245)

	  at
org.jboss.netty.util.internal.ExecutorUtil.terminate(ExecutorUtil.java:87)
	  at
org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory.releaseExternalResources(NioServerSocketChannelFactory.java:146)
	  at
com.company.util.net.transport.ServerNetworkControllerImpl.performPostShutdownCleanup(ServerNetworkControllerImpl.java:81)
	  at
com.company.util.net.transport.BaseNetworkController.shutdown(BaseNetworkController.java:69)
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