dakirily commented on PR #463:
URL: https://github.com/apache/qpid-broker-j/pull/463#issuecomment-6418226295

   NonBlockingConnection.doWork() checks the deadline before doRead(), but 
calls doWrite() unconditionally afterwards. Processing an incoming Close can 
start the deadline during the read. With connection.closeResponseTimeout = 0, 
that deadline has already expired when the handler returns, yet a write is 
still attempted. Likewise, an abort() during the read does not prevent this 
write.
   
   Please recheck the deadline and closed state after doRead(), abort on 
expiry, and skip normal writes once closed. Graceful flushing can remain in 
shutdownFinalWrite().
   
   The existing peer-close test invokes the close handler before doWork(), so 
it misses this path.


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