[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 #72 from Mark Millard <markmi at dsl-only.net> ---
(In reply to Mark Millard from comment #71)

I've done a few runs recovering the ghc.*.core
files and took a quick comparison/contrast:


info reg shows a few registers that seem to be
usually the same or very similar in value:

rbp            0x8053f17c8      0x8053f17c8
rbp            0x8053f17c8      0x8053f17c8

rbp            0x8053f17f8      0x8053f17f8

rbp            0x8053f17b8      0x8053f17b8

rsp            0x7fffffff8a08   0x7fffffff8a08
rsp            0x7fffffff8a08   0x7fffffff8a08
rsp            0x7fffffff8a08   0x7fffffff8a08
rsp            0x7fffffff8a08   0x7fffffff8a08

r13            0x3861ad8        59120344
r13            0x3861ad8        59120344
r13            0x3861ad8        59120344
r13            0x3861ad8        59120344

cs             0x43     67
cs             0x43     67
cs             0x43     67
cs             0x43     67

ss             0x3b     59
ss             0x3b     59
ss             0x3b     59
ss             0x3b     59

By contrast rip can vary some
but the values have the status:
"Cannot access memory at"

rip            0x646b7c 0x646b7c
rip            0x2db9b54        0x2db9b54
rip            0x646b7c 0x646b7c
rip            0x2db9b62        0x2db9b62

So it jumped to an address that can not be
accessed in each case.

For reference for these 4 runs:

[34 of 95] Compiling Language.Haskell.Extension (
libraries/Cabal/Cabal/Language/Haskell/Extension.hs,
bootstrapping/Language/Haskell/Extension.o )
ghc/ghc.mk:111: ghc/stage1/package-data.mk: No such file or directory
gmake[2]: *** [utils/ghc-cabal/ghc.mk:48:
utils/ghc-cabal/dist/build/tmp/ghc-cabal] Bus error (core dumped)
gmake[1]: *** [Makefile:130: all] Error 2
gmake[1]: Leaving directory '/wrkdirs/usr/ports/lang/ghc/work/ghc-8.0.2'
*** Error code 1

[35 of 95] Compiling Distribution.Compiler (
libraries/Cabal/Cabal/Distribution/Compiler.hs,
bootstrapping/Distribution/Compiler.o )
ghc/ghc.mk:111: ghc/stage1/package-data.mk: No such file or directory
gmake[2]: *** [utils/ghc-cabal/ghc.mk:48:
utils/ghc-cabal/dist/build/tmp/ghc-cabal] Bus error (core dumped)
gmake[1]: *** [Makefile:130: all] Error 2
gmake[1]: Leaving directory '/wrkdirs/usr/ports/lang/ghc/work/ghc-8.0.2'
*** Error code 1

[34 of 95] Compiling Language.Haskell.Extension (
libraries/Cabal/Cabal/Language/Haskell/Extension.hs,
bootstrapping/Language/Haskell/Extension.o )
ghc/ghc.mk:111: ghc/stage1/package-data.mk: No such file or directory
gmake[2]: *** [utils/ghc-cabal/ghc.mk:48:
utils/ghc-cabal/dist/build/tmp/ghc-cabal] Bus error (core dumped)
gmake[1]: *** [Makefile:130: all] Error 2
gmake[1]: Leaving directory '/wrkdirs/usr/ports/lang/ghc/work/ghc-8.0.2'
*** Error code 1

[11 of 95] Compiling Data.Binary.Class (
libraries/binary/src/Data/Binary/Class.hs, bootstrapping/Data/Binary/Class.o )
ghc/ghc.mk:111: ghc/stage1/package-data.mk: No such file or directory
gmake[2]: *** [utils/ghc-cabal/ghc.mk:48:
utils/ghc-cabal/dist/build/tmp/ghc-cabal] Bus error (core dumped)
gmake[1]: *** [Makefile:130: all] Error 2
gmake[1]: Leaving directory '/wrkdirs/usr/ports/lang/ghc/work/ghc-8.0.2'
*** Error code 1

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