CPU usage 100% with wildfly 26.

[Arjun Lodhe]

Hello everyone,

We are observing high CPU utilization with security scanner (e.g. Qualys).

So we have a JAVA application deployed on wildfly which works fine normally. But as soon as we run the Qualys scanner the utilization goes high (upto 100%) and it stays like this until we reboot the server or restart the wildfly services. 

Wildfly version: WFLYSRV0050: WildFly Full 26.1.3.Final (WildFly Core 18.1.2.Final).

Also, we dont see this with wildfly version: WFLYSRV0049: WildFly Full 19.0.0.Final (WildFly Core 11.0.0.Final)

Regards,

Arjun

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[Pratik Gupta]

Hi,

We are also facing the same issue where CPU utilization going very high at the time of security scan. Any solution or workaround for this? 

- Pratik

[Kumar Dawani]

Hello All,

Lot of of our customers are facing the similar issue, please suggest a quick fix or workaround for this issue.

If anyone has any clue to the fix or root cause of the issue please post it would be really helpful.

Regards,

Kumar

[Darran Lofthouse]

I would suggest seeing if you can reproduce this in a non production environment so that you can undertake some investigation as to what is happening.

A couple of things that may be useful could be some GC logging and a few thread dumps taken during the high CPU utilisation to try and see what is happening at the time.

[Arjun Lodhe]

Thank you for the response Darran Lofthouse. 

Unfortunately, when the CPU  utilization is high, we are not able to generate heapdump or threaddump. However I managed to generate process stack using gdb and almost all the processes are stuck here:

Thread 246 (Thread 0x7fa93ceb5700 (LWP 8409)):
#0  0x00007fa965568a35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fa964432873 in os::PlatformEvent::park() () from /usr/lib/jvm/java-11-openjdk-11.0.18.0.10-1.el7_9.x86_64/lib/server/libjvm.so
#2  0x00007fa9643dc1a2 in Monitor::IWait(Thread*, long) () from /usr/lib/jvm/java-11-openjdk-11.0.18.0.10-1.el7_9.x86_64/lib/server/libjvm.so
#3  0x00007fa9643dcd66 in Monitor::wait(bool, long, bool) () from /usr/lib/jvm/java-11-openjdk-11.0.18.0.10-1.el7_9.x86_64/lib/server/libjvm.so
#4  0x00007fa96414a08e in JVM_WaitForReferencePendingList () from /usr/lib/jvm/java-11-openjdk-11.0.18.0.10-1.el7_9.x86_64/lib/server/libjvm.so
#5  0x00007fa94ab50a30 in ?? ()
#6  0x00007fa93ceb48f0 in ?? ()

Regards,

Arjun

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