[Bug 107366] NIR verification crashes on piglit tests

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107366

            Bug ID: 107366
           Summary: NIR verification crashes on piglit tests
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Keywords: bisected, regression
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: danylo.piliaiev at gmail.com
          Reporter: mark.a.janes at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org
                CC: baker.dylan.c at gmail.com, jason at jlekstrand.net

Running piglit tests with NIR_TEST_CLONE=true NIR_TEST_SERIALIZE=true,
thousands of piglit tests crash:

NIR_TEST_CLONE=true NIR_TEST_SERIALIZE=true
/tmp/build_root/m64/lib/piglit/bin/shader_runner
/tmp/build_root/m64/lib/piglit/generated_tests/spec/arb_tessellation_shader/execution/built-in-functions/tcs-op-mult-float-mat4.shader_test
-auto -fbo
piglit: debug: Requested an OpenGL 3.2 Core Context, and received a matching
4.5 context

Segmentation fault


Bisected to:
d219521379626ebf2bff63e4a9c2f92725b3926a is the first bad commit
commit d219521379626ebf2bff63e4a9c2f92725b3926a
Author: Danylo Piliaiev <danylo.piliaiev at gmail.com>
Date:   Wed Jul 11 15:29:00 2018 +0300
    i965: Sweep NIR after linking phase to free held memory

    After optimization passes and many trasfromations most of memory
    NIR holds is a garbage which was being freed only after shader deletion.
    Freeing it at the end of linking will save memory which would be useful
    in case there are a lot of complex shaders being compiled.
    The common case for this issue is 32bit game running under Wine.

    The cost of the optimization is around ~3-5% of compilation speed
    with complex shaders.

    V2: by Jason Ekstrand
        - Move nir_sweep up, right after the last change of NIR

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103274
    Signed-off-by: Danylo Piliaiev <danylo.piliaiev at globallogic.com>
    Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>
    Cc: mesa-stable at lists.freedesktop.org

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