[Bug 111009] Segmentation fault when running shader on Intel Mesa

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Jun 26 22:58:54 UTC 2019


            Bug ID: 111009
           Summary: Segmentation fault when running shader on Intel Mesa
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: jiradet.jd at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 144650
  --> https://bugs.freedesktop.org/attachment.cgi?id=144650&action=edit
The shader containing code that produces an error and the stack trace by

I ran a piglit shader test with the following fragment shader which should
render the red solid color image. However, I got an error: Segmentation fault
(core dumped). The attachment are the shader and the log obtained when running
shader runner with catchsegv tool (by using command “catchsegv
./bin/shader_runner_gles3 shaders/sample.shader_test”).

void main()
     int _injected_loop_counter = 0;
     1 != int((injectionSwitch.y));
   if(gl_FragCoord.y < 0.0)
   _GLF_color = vec4(1.0, 0.0, 0.0, 1.0);
   if(gl_FragCoord.x < 0.0)
 while(0.0 > injectionSwitch.y);

uniform vec2 injectionSwitch 0.0 1.0
draw rect -1 -1 2 2

Steps to reproduce:
1. Obtain and build piglit, the Mesa OpenGL test suite runner:
2. Download the attached archive.
3. From a terminal, execute the supplied tests with the piglit GLES3 shader
$ bin/shader_runner_gles3 result.shader_test

Build & PC specs:
CPU: Intel Core i7-2860QM
GPU: Intel Sandybridge Mobile

OS: Ubuntu 18.04.2 LTS
libdrm: git-46cb2aa1ede16380df2d965ca125d855c4278823 (most recent as of this
Mesa: git-d19fe5e67a3945582448748c72b10fd5029d2ed5 (most recent as of this
Linux kernel version: 4.18.0-20-generic

This bug was found with GraphicsFuzz: https://github.com/google/graphicsfuzz

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