[Bug 92782] Segfaults when running dEQP-GLES3.functional.shaders.conversions.matrix_combine.*

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92782

            Bug ID: 92782
           Summary: Segfaults when running
                    dEQP-GLES3.functional.shaders.conversions.matrix_combi
                    ne.*
           Product: Mesa
           Version: 10.5
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: glsl-compiler
          Assignee: idr at freedesktop.org
          Reporter: corentin at wallez.net
        QA Contact: intel-3d-bugs at lists.freedesktop.org

While running the GLES3 dEQP tests on ANGLE the Intel Mesa driver, many of the
tests in dEQP-GLES3.functional.shaders.conversions.matrix_combine.* segfault in
the driver in glLinkProgram.

This was running on an Ubuntu variant with the following:
OpenGL renderer string: Mesa DRI Intel(R) HD Graphics 5500 (Broadwell GT2) 
OpenGL core profile version string: 3.3 (Core Profile) Mesa 10.5.9
OpenGL core profile shading language version string: 3.30

I was able to repro the crash using the following vertex shader:
#version 330
in vec4 vPosition;
in vec3 v1;
in vec3 v2;
in vec2 v3;
out mat4x2 out0;
void main(){
(gl_Position = vPosition);
(out0 = mat4x2(v1, v2, v3));
}

and the following fragment shader:
#version 330
in mat4x2 out0;
out vec4 FragColor;
void main(){
(FragColor = vec4(1.0, out0[1][1], 0.0, 1.0));
}

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