[jira] [Assigned] (KARAF-7707) Eternal high CPU load when using Gogo plugin in web console

["Jean-Baptiste Onofré (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KARAF-7707?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jean-Baptiste Onofré reassigned KARAF-7707:
-------------------------------------------

    Assignee: Jean-Baptiste Onofré

> Eternal high CPU load when using Gogo plugin in web console
> -----------------------------------------------------------
>
>                 Key: KARAF-7707
>                 URL: https://issues.apache.org/jira/browse/KARAF-7707
>             Project: Karaf
>          Issue Type: Question
>          Components: webconsole
>    Affects Versions: 4.4.0
>            Reporter: Daniel van Mil
>            Assignee: Jean-Baptiste Onofré
>            Priority: Major
>
> Sometimes when we open (and sometimes not even interact) with the Karaf web console Gogo plugin we get a very high CPU load (100%) from that point and Karaf never seems to recover from this.
>  
> {code:java}
> Analysis of the showed us the following thread caused this:
> "Thread-210" #16393 prio=5 os_prio=0 cpu=22819544.54ms elapsed=77820.53s tid=0x00007f21101c86c0 nid=0x406e runnable [0x00007f20c319a000]
> java.lang.Thread.State: RUNNABLE
> at org.apache.karaf.webconsole.gogo.GogoPlugin$SessionTerminal.run(GogoPlugin.java:247)
> at java.lang.Thread.run(java.base@17.0.2/Thread.java:833)
> Locked ownable synchronizers:
> None{code}
> which points to the GogoPlugin. 
> A quick look at the gogo plugin shows some suspicious code: [https://github.com/apache/karaf/blob/main/webconsole/gogo/src/main/java/org/apache/karaf/webconsole/gogo/GogoPlugin.java#L55]
> where the plugin could end in and endless loop causing high CPU load.
> Strange thing is we can only find a few appearances of people who ran into this, like [https://community.talend.com/s/question/0D53p00007vCkucCAC/runtime-esb-high-cpu-load-caused-by-webconsole-gogo-?language=en_US]
> It could be caused by the fact that we run Karaf on AWS and also behind an nginx, but by debugging Karaf locally we can also reproduce the issue somehow; the plugin sometimes receives strange characters and seems to go into an endless loop.
> Is this a known issue?



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