[Bug 92940] [HSW, bisected][GLES 31 CTS][Regression] ES31-CTS.gtf.GL31Tests.shader_helper.shader_helper - segfault/assert

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92940

            Bug ID: 92940
           Summary: [HSW, bisected][GLES 31 CTS][Regression]
                    ES31-CTS.gtf.GL31Tests.shader_helper.shader_helper -
                    segfault/assert
           Product: Mesa
           Version: 11.0
          Hardware: Other
                OS: All
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: marta.lofstedt at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Software versions:
    4.3.0-rc3
    OpenGL version string: 3.0 Mesa 11.1.0-devel (git-a29d922)

GPU hardware:
    OpenGL renderer string: Mesa DRI Intel(R) Haswell Desktop 
    00:02.0 VGA compatible controller [0300]: Intel Corporation Xeon E3-1200
v3/4th Gen Core Processor Integrated Graphics Controller [8086:0412] (rev 06)

CPU hardware:
    x86_64
    Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
Khronos CTS version:
git at 29e4891ef6

command:
./glcts --deqp-case=ES31-CTS.gtf.GL31Tests.shader_helper.shader_helper

Environment:
Mesa built with: --enable-debug
export MESA_GLES_VERSION_OVERRIDE=3.1
export MESA_EXTENSION_OVERRIDE=GL_ARB_compute_shader
-----------------------------------------------------

With debug build the ES31-CTS.gtf.GL31Tests.shader_helper.shader_helper asserts
with:
glcts: nir/nir.c:1569: nir_intrinsic_from_system_value: Assertion `!"system
value does not directly correspond to intrinsic"' failed.
Aborted (core dumped)
On a build without debug the test segfaults. 
This issue is blocking OpenGL ES 3.1 conformance testing.

The regression was bisected to the following commit:

commit 20748318c5b870fc27f699637041e67a67321f5f
Author: Ilia Mirkin <imirkin at alum.mit.edu>
Date:   Mon Sep 14 16:13:43 2015 -0400

    glsl: add gl_HelperInvocation system value

    Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
    Reviewed-by: Matt Turner <mattst88 at gmail.com>

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