[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 #9 from Nils Beyer <nbe at renzel.net> ---
(In reply to Nils Beyer from comment #2)

believe it or not, I also get these
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error: unable to rename temporary 'OptParserEmitter.o-a86dcd92' to output file
'OptParserEmitter.o': 'No such file or directory'
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while _not_ using TMPFS; here's the script I'm running:
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#!/bin/sh

OBJDIR="/tmp/ryzen_stress_test"

trap "exit 1" 1 2 3

cd /usr/src
mkdir ${OBJDIR}

while [ 1 ]; do
        echo "`date` begin"
        BEG="`date +%s`"
#       umount ${OBJDIR} ; umount ${OBJDIR} ; umount ${OBJDIR}
#       mount -t tmpfs tmpfs ${OBJDIR} || exit 1
        rm -rf ${OBJDIR}
        mkdir ${OBJDIR}
        export MAKEOBJDIRPREFIX=${OBJDIR}
        make -j20 buildworld buildkernel >${OBJDIR}/${BEG}.log 2>&1
        ERR="$?"
        echo "`date` end - errorcode ${ERR}"
        [ "${ERR}" != "0" ] && cp ${OBJDIR}/${BEG}.log ~/.
        rm ${OBJDIR}/${BEG}.log
done
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