[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 #90 from Don Lewis <truckman at FreeBSD.org> ---
When stealing a thread from the other SMT thread on the same core, another
tuning knob comes into play, kern.sched.steal_thresh.  A thread will only be
stolen if the that value, which defaults to 2.  My previous experiment used the
default, but for my latest experiment, I set it to 1, to match the hardwired
value that is used for stealing from other levels of the hierarchy.

The results were definitely poor.  In addition to the usual ghc SIGBUS,
lang/guile2 failed to build due to a SIGSEGV, textproc/p5-String-ShellQuote
failed in the fetch phase when make got a SIGBUS, and editors/libreoffice
failed to build  because of a clang SIGABRT.

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