[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 #94 from Don Lewis <truckman at FreeBSD.org> ---
In my latest experiment, I still restricted the steal_idle to the CCX of the
current SMT thread.  At the CCX level, I changed thresh back to 1, but I also
excluded the current core so that stealing from the other SMT thread can only
happen if the steal_thresh condition was met for it on the first pass.  I still
a fair amount of build fallout.  In addition to the usual ghc SIGBUS, I also
saw a couple of clang SIGABRT failures when building security/nss and
www/webkit2-gtk3.  Also lang/go failed with these errors:

fatal error: runtime\xc2\xb7lock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
fatal error: runtime\xc2\xb7unlock: lock count
[snip]
fatal: morestack on g0
SIGTRAP: trace trap
PC=0x44ef02 m=1 sigcode=1

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