[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 #89 from Don Lewis <truckman at FreeBSD.org> ---
In my latest experiment, I hacked the sched_ule steal_idle code to only allow
threads to be stolen from the other SMT thread on the same core and set
steal_idle=1.  CPU idle time was greatly reduced, but ghc failed with SIGBUS
and chromium failed with the rename problem.

I don't necessarily count this as a failure since the first time I tried
steal_idle=0, balance=0, and affinity=1000 I got the same two failures.  The
rename problems just seem to be really rare.  The ghc failures definitely
seemed to improve with steal_idle=0, but this experiment only provides one data
point.

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