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https://issues.apache.org/jira/browse/GUACAMOLE-958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17035392#comment-17035392
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Jonas Zeiger commented on GUACAMOLE-958:
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I added a PR hopefully taking care of the issue:
[https://github.com/apache/guacamole-server/pull/257]
> Race in guacd client termination
> --------------------------------
>
> Key: GUACAMOLE-958
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-958
> Project: Guacamole
> Issue Type: Bug
> Components: guacd
> Affects Versions: 1.1.0
> Reporter: Jonas Zeiger
> Priority: Minor
>
> I observed delays when trying to shutdown guacd cleanly:
> {code:java}
> 2020-02-12 12:20:52.886 [some-app] [0c7bfb7f-c009-4685-8b83-a144aa0bb4f6]
> [140049387599616]: guacd[174]: DEBUG: Client terminated successfully.
> 2020-02-12 12:20:52.887 [some-app] [0c7bfb7f-c009-4685-8b83-a144aa0bb4f6]
> [140049387599616]: guacd[166]: ERROR: Error handling message from VNC
> server.
> 2020-02-12 12:20:52.887 [some-app] [0c7bfb7f-c009-4685-8b83-a144aa0bb4f6]
> [140049387599616]: guacd[166]: INFO: User
> "@e2dac0b0-5e01-4b3e-8898-14d2d351abee" disconnected (0 users remain)
> 2020-02-12 12:20:52.887 [some-app] [0c7bfb7f-c009-4685-8b83-a144aa0bb4f6]
> [140049387599616]: guacd[166]: INFO: Last user of connection
> "$902a4fea-c198-409f-a249-9a5dbaa4bdec" disconnected
> 2020-02-12 12:20:52.887 [some-app] [0c7bfb7f-c009-4685-8b83-a144aa0bb4f6]
> [140049387599616]: guacd[166]: DEBUG: Requesting termination of
> client...
> 2020-02-12 12:20:52.887 [some-app] [0c7bfb7f-c009-4685-8b83-a144aa0bb4f6]
> [140049387599616]: guacd[166]: INFO: Internal VNC client disconnected
> 2020-02-12 12:20:57.887 [some-app] [0c7bfb7f-c009-4685-8b83-a144aa0bb4f6]
> [140049387599616]: guacd[166]: WARNING: Client did not terminate in a
> timely manner. Forcibly terminating client and any child processes.
> {code}
> I suspect the client actually terminated properly (see log message "Internal
> VNC client disconnected").
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