[Bug 93722] Segfault when compiling shaders with more than one subroutine uniform

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93722

            Bug ID: 93722
           Summary: Segfault when compiling shaders with more than one
                    subroutine uniform
           Product: Mesa
           Version: 11.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: glsl-compiler
          Assignee: idr at freedesktop.org
          Reporter: nioko1337 at googlemail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

The fragment shader in question:

                #version 330
                #extension GL_ARB_shader_subroutine : require
                #extension GL_ARB_explicit_uniform_location : require

                out vec4 fragColor;
                subroutine vec4 color_t();
                subroutine vec4 modify_t(vec4 color);

                subroutine uniform color_t Color;
                subroutine uniform modify_t Modify;

                subroutine(color_t)
                vec4 ColorRed()
                {
                  return vec4(1, 0, 0, 1);
                }

                subroutine(color_t)
                vec4 ColorBlue()
                {
                  return vec4(0, 0.4, 1, 1);
                }

                subroutine(modify_t)
                vec4 SwapRB(vec4 color)
                {
                  return vec4(color.b, color.g, color.r, color.a);
                }

                subroutine(modify_t)
                vec4 DeleteR(vec4 color)
                {
                  return vec4(0, color.g, color.b, color.a);
                }

                void main()
                {
                    vec4 color = Color();
                    fragColor = Modify(color);
                }

Some debug logs I could gather:
[...]
[OpenGL] CreateShader(35632)
[OpenGL] ShaderSource(2, 1, 0x7fff29927210, 0x0)
[OpenGL] CompileShader(2)
An unknown error occurred

dmesg output:
[78197.436774] subroutines[12214]: segfault at 60 ip 00007f9d05705f70 sp
00007fff1f1da118 error 4 in i965_dri.so[7f9d0545c000+5d7000]

Also happens when using llvm renderer:
[78750.763639] subroutines[12766]: segfault at 60 ip 00007f25b4e88230 sp
00007fff299269f8 error 4 in swrast_dri.so[7f25b4bca000+86b000]

This is my first bug report, so I'm not entirely sure if I'm doing this
completely right.

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