[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 #53 from Don Lewis <truckman at FreeBSD.org> ---
I change the CPU clock speed from 3.0 GHz to the default 3.4 GHz and things
were not quite as rosey.  These were the failures:

 * ghc SIGBUS as usual

 * www/node - clang died with SIGABRT, but I did not find an assert message.

 * lang/go - one of the usual malloc arena consistency problems, this time
   failing with:

    failed MSpanList_InsertBack 0x8008bdb90 0x8008ba4f0 0x0 0x0
    fatal error: MSpanList_InsertBack

 * devel/py-singledispatch failed during extract with SIGBUS.  It looks
   like make was the victim.

 * editors/libreoffice failed due to a clang SIGABRT with no assert messages.

Interestingly both node and libreoffice core files indicate that c++ died at
the same place.

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