On 8/13/20 2:04 PM, Wells, Roger K. via devel wrote:
After some time, usually hours, the following four tasks in top are running at 100%: sadc kworker/6:1+events_freezable dmesg systemd-journal
So sadc is not part of current Fedora. It may be some artifact from older Fedoras (e.g. sysstat-11.5.7-4.fc27.x86_64 has /usr/lib64/sa/sadc) or some custom system activity data collection software that is locally installed at your site.
My guess is it goes bonkers and causes frantic kernel worker thread activity, and generates tons of messges, keeping dmesg and journal busy. Please look into that, and let us know what you find out.
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