[Bug 288507] amd64 page fault while in kernel mode in vm_pageout_scan_active while RAM+SWAP 704 GiBytes was mostly used

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288507

--- Comment #12 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Mark Millard from comment #2)

Relative to the GENERIC(-DEBUG) kernel, I've
rebooted with it and tried building just
sdl2_gpu in poudriere(-devel) . Each attempt
runs dot as 3 processes, 2 threads per. These
use up RAM+SWAP and one of the dot processes
is killed. The 2 left run, use up the RAM+SWAP 
gain, and one of the dots is killed. The dot
that is left uses up the RAM_SWAP again and is
then killed. The port then goes on to complete
as a successful build.

So far no panics and no debug-reports by the
debug-kernel from multiple tries.

This is without being part of an overall
bulk -Ca run. So the system is not otherwise
busy.

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