How do I find out what is locking up my CPU (kernel:watchdog: BUG: soft lockup - CPU#3 stuck for 21s! [java:1026941])

paul.edi

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HI all,

I recently had the feeling that my server had some problems.
Even my ssh session stuck for a few seconds.
and then I've seen this on the SSH:
kernel:watchdog: BUG: soft lockup - CPU#3 stuck for 21s! [java:12399]

What does this tell me?
OK it is clear what it does tell me, but how do I get more information?

When I'm looking for the PID = 12399 I can't find it (seems to be terminated?)
But how could I find out what it was? (more then a Java application)
It would be good to know what command line was used to start it.

The server is a Oracle Linux Server 8.
 
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