[Bug 43516] New: GCC march=native Flag Causes " Unhandled Pagefault on Write"

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=43516

            Bug ID: 43516
           Summary: GCC march=native Flag Causes "Unhandled Pagefault on
                    Write"
           Product: Wine
           Version: 2.14
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: ben at xnode.org
      Distribution: ---

I've run into a specific crash that only happens with using the "-march=native"
GCC flag at build time (usage of -O3 or -O2 don't affect it). Removing "march"
entirely stops the crash from occurring.

This is on a Intel Broadwell i7-5775C using GCC 7.1.1.

Triggering the crash is unfortunately a bit specific: The crash occurs when
loading Mario Kart 8 in CEmu (1.8) under a 64bit Wine prefix. The exact moment
it happens is once the game's splash screen appears - pressing A should then
take you to the menu, but instead if Wine has been built with march=native,
it'll throw an Unhandled Pagefault at this point instead:

"wine: Unhandled page fault on write access to 0x7f7fda6f0080 at address
0x1400e1867 (thread 005f), starting debugger..."

According to GCC, the flags it activates when using march=native on this
platform are:
-march=broadwell -mmmx -mno-3dnow -msse -msse2 -msse3 -mssse3 -mno-sse4a -mcx16
-msahf -mmovbe -maes -mno-sha -mpclmul -mpopcnt -mabm -mno-lwp -mfma -mno-fma4
-mno-xop -mbmi -mno-sgx -mbmi2 -mno-tbm -mavx -mavx2 -msse4.2 -msse4.1 -mlzcnt
-mrtm -mhle -mrdrnd -mf16c -mfsgsbase -mrdseed -mprfchw -madx -mfxsr -mxsave
-mxsaveopt -mno-avx512f -mno-avx512er -mno-avx512cd -mno-avx512pf
-mno-prefetchwt1 -mno-clflushopt -mno-xsavec -mno-xsaves -mno-avx512dq
-mno-avx512bw -mno-avx512vl -mno-avx512ifma -mno-avx512vbmi -mno-avx5124fmaps
-mno-avx5124vnniw -mno-clwb -mno-mwaitx -mno-clzero -mno-pku -mno-rdpid --param
l1-cache-size=32 --param l1-cache-line-size=64 --param l2-cache-size=6144
-mtune=broadwell -fPIE -fstack-check=specific -fstack-protector-strong
(in case any of those stand out as being an issue when used with Wine)

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