[Bug 225584] Various compile process hang on Ryzen, but not on Intel

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225584

--- Comment #11 from Eugene Grosbein <eugen at freebsd.org> ---
(In reply to mike from comment #9)

These threads locked in "umtxn" state remind me of
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=186114 that revealed
long-standing bugs in our libc
being not cancel-safe for multi-threaded code (fixed now). The problem was a
race and could be reproduced in very specific load pattern leading mutex lock
leak and following live-lock.

I suspect we may be facing similar problem here that is not hardware-specific
but is more probably to hit with specific hardware due to different timings.

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