[Mesa-dev] [Bug 109259] Mesa compiled with LLVM/clang-7.0 segfaults

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109259

            Bug ID: 109259
           Summary: Mesa compiled with LLVM/clang-7.0 segfaults
           Product: Mesa
           Version: 18.3
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: tpgxyz at gmail.com
        QA Contact: mesa-dev at lists.freedesktop.org

Hi,

we have noticed that mesa-18.3.x segfault when it is compiled with
LLVM/clang-7.0.x and run on older hardware.

After some deep digging we noticed this may be related to missing AVX
instructions on these machines, even if we build for generic x86_64, i686
targets.

Fast workaround for eliminating segfaults was to build Mesa with gcc :(
https://github.com/OpenMandrivaAssociation/mesa/commit/4d330587a4d80012c5888e1a33a01a7a979b84e8

Rebuilding Mesa with LLVM/clang-7.0.1 still segfaults. 

Our users have reported this occurs on:
r600 driver
nvidia gfx card
AMD Athlon II X4 620
AMD Phenom II x4 N930
Intel Quad 9650
Intel i3 530

Links to bug reports:
https://issues.openmandriva.org/show_bug.cgi?id=2381
https://issues.openmandriva.org/show_bug.cgi?id=2393

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