Follow-up to mailing list discussion.
I was now able to reproduce the problem with a MINA test. Or let's say I did the brute-force approach by re-running one test in an endless loop.
I have attached a patch of AbstractIoServiceTest (against https://github.com/apache/mina/tree/2.0) and a stack trace. After a few loops the test is stuck. You can see a lot of threads hanging in dispose() and the test is stuck when it tries to dispose the acceptor.
What is a little strange is that the javadoc says that connector.dispose(TRUE) should not be called from an IoFutureListener, but in the test it is done anyway. However, changing the parameter to FALSE does not help either.
Is there anything that can be done to prevent this hang?