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https://issues.apache.org/jira/browse/SSHD-340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14109110#comment-14109110
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Sampo Savolainen commented on SSHD-340:
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This seems to be connected to sessions opened on the server. If I wait 60
seconds after closing a session to the server, the server will immediately shut
down properly without leaving threads behind.
> Hanging threads
> ---------------
>
> Key: SSHD-340
> URL: https://issues.apache.org/jira/browse/SSHD-340
> Project: MINA SSHD
> Issue Type: Bug
> Affects Versions: 0.12.0
> Reporter: Sampo Savolainen
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> SSHD fails to stop properly due to errant threads. I've attached a thread
> dump from a point of execution where everything should have been cleaned up.
> The hanging threads happen only if the server has accepted connections and
> they do not hang forever, they seem to stop themselves after a minute or so.
> This might be an executor pool which is not shut down correctly.
> Earlier versions (0.8.0 and 0.9.0) did not exhibit this behavior.
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