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https://issues.apache.org/jira/browse/SSHD-635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15129903#comment-15129903
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Goldstein Lyor commented on SSHD-635:
-------------------------------------
I have looked into it and tried to create conditions that can lead to such a
hang but cannot cause it (perhaps it is very difficult to time the events
correctly). I have added a "defensive" check on the
_ClientSessionImpl#preClose_ call to be on the safe side. The issue description
states that it is a "potential" hang, so in the absence of some way to
re-create or pinpoint it, this is the best I can do for now.
> potential hang in AuthFuture.verify(Long.MAX_VALUE) on error
> ------------------------------------------------------------
>
> Key: SSHD-635
> URL: https://issues.apache.org/jira/browse/SSHD-635
> Project: MINA SSHD
> Issue Type: Bug
> Reporter: Oliver Stöneberg
> Attachments: ssh.log
>
>
> It appears that after the SshClient.connect().verify() call was successful
> the ClientSession.auth().verify() call might hang if the connection was
> closed in-between those calls. If AuthFuture.verify() is called with a
> timeout it correctly times out, but I would expect it to detect that the
> connection is closed/closing and throw a proper error even without the
> timeout.
> The errors I see in the log are these (more completel log attached):
> DEBUG [sshd-SshClient[329a1f8d]-nio2-thread-5] (Nio2Session.java:137) Caught
> IOException[An established connection was aborted by the software in your
> host machine] - calling handler
> DEBUG [sshd-SshClient[329a1f8d]-nio2-thread-5] (Nio2Session.java:142)
> Exception handler threw IllegalStateException, closing the session: No
> session available
> It's hard to debug for me since it only happens in a multi-threaded scenario
> and I haven't been able to generate separate logs per session (is this even
> possible?)
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