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From "masc (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SSHD-743) Nio2Session sporadically leaks exceptions from nio2 threads
Date Wed, 15 Nov 2017 19:51:01 GMT

    [ https://issues.apache.org/jira/browse/SSHD-743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16254055#comment-16254055
] 

masc commented on SSHD-743:
---------------------------

Thinking about it, you're right.

The latter issue actually does not relate, as it doesn't leak the exception, but rather fails
from recovering from it. 
When it occurs, the process won't terminate and the server will still be accepting connections,
but fail to establish a functional session.

> 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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