[Bug 105271] WebGL2 shader crashes i965_dri.so 17.3.3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105271

            Bug ID: 105271
           Summary: WebGL2 shader crashes i965_dri.so 17.3.3
           Product: Mesa
           Version: 17.3
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: hugues.evrard at graphicsfuzz.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Running a WebGL2 shader through Firefox crashes the tab, and the crash
originates from i965_dri.so. See the Mozilla crash details here:

https://crash-stats.mozilla.com/report/index/89138e8c-9743-4697-b67b-9185b1180227

dmesg indicates what seems like a division by zero:

[ 9949.151041] traps: Web Content[1889] trap divide error ip:7fcb84f87bd0
sp:7ffedcf28570 error:0 in i965_dri.so[7fcb84c48000+7ed000]

For ease of reproduction, this web page will automatically run this WebGL
shader:
http://hevrard.org/unlinked/graphicsfuzz/benchmark/android-v1/shader06.html

Setup:

CPU: i3-6100U
GPU: Intel HD 520
Mesa: 17.3.3 (as shipped in Debian testing)
Linux 4.14.0-3-amd64 #1 SMP Debian 4.14.17-1 (2018-02-14)

This shader is part of the GraphicsFuzz demo, a small excerpt of shaders that
trigger issues on most Android platforms. It does not use to cause much trouble
on Mesa, but updating to Mesa 17.3.3 lead to appearance of that crash issue.
You can easily try the 15 tests of the on-line demo here:

http://www.graphicsfuzz.com/#demo

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