Re: EXTERNAL: Re: hundred percent cpu load

[Przemek Klosowski via devel <devel@xxxxxxxxxxxxxxxxxxxxxxx>]

On 8/14/20 8:33 AM, Wells, Roger K. via devel wrote:

That was not the cause. 
Now when it happens I have only three tasks running at 100% (same ones
as reported earlier).
Everything else, kerneloops, shutdown via power switch, etc, is as before.

Could you repost to the list with more info? I think you're saying that after removing sadc you still are 100% CPU with

kworker/6:1+events_freezable
dmesg
systemd-journal

running full tilt. THis probably means that it's the kernel worker threads are doing something that causes lots of errors, and all the other processes (including sadc that is now gone) are just busy writing those errors.

So, what is kernel doing? what does your system log say? type 'dmesg' or 'journalctl -e' and look at the end of the data.

Also, the perf toolkit might help as explained in https://askubuntu.com/questions/33640/kworker-what-is-it-and-why-is-it-hogging-so-much-cpu

1. Install perf:

   sudo apt-get install linux-tools-common linux-tools-3.11.0-15-generic
   

   (The second package must match your kernel version. You can first install just linux-tools-common and call perf to let it tell you which package it needs.)

2. Record some 10 seconds of backtraces on all your CPUs:

   sudo perf record -g -a sleep 10
   

3. Analyse your recording:

   sudo perf report
   

   
   

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