Netty close the channel internally without any exception

[王福强]

the exceptionCaught() doesn't print out any exception information, 
and it seems that the channel is closed 'normally'.

we have 16*2 channels running in a same vm, each channel will blocked until
close is requested externally, the after each channel connected, I write
such code to wait until the channel is closed externally:
....
            while (running) {
                try {
                    if (future.getChannel().getCloseFuture()
                            .await(Integer.MAX_VALUE, TimeUnit.SECONDS)) {
                        logger.info("working channel:'{}' has been closed
internally.",
                                future.getChannel());
                        logger.info(
                                "working channel internal close reason:{}",
                               
ExceptionUtils.getFullStackTrace(future.getChannel()
                                        .getCloseFuture().getCause()));
                        break;
                    }
                    
                } catch (InterruptedException e) {
                    logger.info("ErosaWorkingChannelRunnable is interrupted,
"
                            + "we will break the loop and end it.");
                    Thread.currentThread().interrupt();
                    break;
                }
            }



        } finally {
            if (channel != null) {
               
channel.close().awaitUninterruptibly().addListener(ChannelFutureListener.CLOSE);
            }
        }

It seems that the channel just close internally without any information, is
there any way I can debug on this?  
(maybe too many threads reside in one VM? when we split different channels
to different vm instances, the problem seems fixed, I really can't figure
out why)

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