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https://issues.apache.org/jira/browse/SSHD-743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16248536#comment-16248536
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Goldstein Lyor commented on SSHD-743:
-------------------------------------
I guess what bothers me is that {{catch (Exception e)}} - seems a bit too
generic - perhaps only {{catch (IOException e)}} would be better. This way, if
we have some internal bug (e.g., NPE) it won't be suppressed...but then we
should make sure that only this kind of exceptions are thrown by
{{startWriting}} if there is a problem with the socket.
> Nio2Session sporadically leaks exceptions from nio2 threads
> -----------------------------------------------------------
>
> Key: SSHD-743
> URL: https://issues.apache.org/jira/browse/SSHD-743
> Project: MINA SSHD
> Issue Type: Bug
> Affects Versions: 1.3.0, 1.4.0, 1.6.0
> Reporter: masc
> Assignee: Goldstein Lyor
> Priority: Critical
>
> We are using {{sshd-core}} for tcp forwarding/tunnelling.
> Since updating to {{1.3.0}} we see sporadic process terminations caused by
> exceptions leaking from nio2 threads.
> I had to downgrade to {{1.2.0}} to stabilise.
> {code}
> 2017-04-21 18:56:28,606 1245641365 sshd-SshServer[4be7acd9]-nio2-thread-3
> org.apache.sshd.server.session.ServerSessionImpl WARN -
> exceptionCaught(ServerSessionImpl[leoz@/185.17.206.254:21464])[state=Opened]
> InterruptedByTimeoutException: null
> 2017-04-21 18:56:28,606 1245641365 sshd-SshServer[4be7acd9]-nio2-thread-3
> org.deku.leoz.node.Application ERROR - Writing not allowed due to timeout or
> cancellation
> java.lang.IllegalStateException: Writing not allowed due to timeout or
> cancellation
> at
> sun.nio.ch.AsynchronousSocketChannelImpl.write(AsynchronousSocketChannelImpl.java:350)
> at
> sun.nio.ch.AsynchronousSocketChannelImpl.write(AsynchronousSocketChannelImpl.java:399)
> at
> org.apache.sshd.common.io.nio2.Nio2Session.doWriteCycle(Nio2Session.java:334)
> at
> org.apache.sshd.common.io.nio2.Nio2Session.startWriting(Nio2Session.java:318)
> at
> org.apache.sshd.common.io.nio2.Nio2Session.finishWrite(Nio2Session.java:393)
> at
> org.apache.sshd.common.io.nio2.Nio2Session.handleWriteCycleFailure(Nio2Session.java:387)
> at
> org.apache.sshd.common.io.nio2.Nio2Session$2.onFailed(Nio2Session.java:348)
> at
> org.apache.sshd.common.io.nio2.Nio2CompletionHandler.lambda$failed$1(Nio2CompletionHandler.java:46)
> at java.security.AccessController.doPrivileged(Native Method)
> at
> org.apache.sshd.common.io.nio2.Nio2CompletionHandler.failed(Nio2CompletionHandler.java:45)
> at sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:128)
> at sun.nio.ch.Invoker$2.run(Invoker.java:218)
> at
> sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:112)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> {code}
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