Daniel van Mil created KARAF-7707:
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Summary: 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
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.
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([email protected]/Thread.java:833)
Locked ownable synchronizers:
- None
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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