[Bug 221029] AMD Ryzen: strange compilation failures using poudriere or plain buildkernel/buildworld

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221029

--- Comment #79 from Mark Millard <markmi at dsl-only.net> ---
(In reply to Mark Millard from comment #77)

I have started a poudriere bulk -a based on:

sysctl kern.sched.balance=1
sysctl kern.sched.steal_idle=0

with:

#PARALLEL_JOBS=1
ALLOW_MAKE_JOBS=yes

and ALLOW_MAKE_JOBS_PACKAGES having a match
for lang/ghc (and various others, although
this should not matter given ALLOW_MAKE_JOBS)

So far it is working (relative to avoiding SIGEGV
and SIGBUS and the like) and it has managed to
build lang/ghc .

It likely will be days before it completes a pass.
I'll add notes about what it does for SIGSEGV,
SIGBUS, and the like.

So for it appears that kern.sched.steal_idle is the
primary context that matters. If kern.sched.balance
matters it seems to be less frequently that it does.

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