I have had a crash issue with Linux, which when I was forced to logout and log back in, I found that the boinc process "yafu" was running about 1024-1178% in the CPU power column. boincmgr was off. When I activated it, it said that the process was still active with 12 cores running. I hit "Suspend", which changed all of the options in boincmgr, but in "top", yafu remained unchanged.
Cannot kill (SIGTERM / SIGKILL) process, as it has the permission of boinc to run, not my permission.

Seems like yafu isn't listening to me or boinc any more.

Gallery containing different combinations of Suspended and Running BOINC.

A friend recommended using

sudo taskset -pc 0 [PID]

which bumped the CPU usage down to 300%, but the task still is not responding to BOINC command to suspend.

I reset the computer and yafu jumped immediately back to 12 full core usage, and does not respond to BOINC commands. This is preventing me from doing other work, and will need to suspend the project completely, in order to break its hold over my CPU, provided we cannot find an amenable solution.