[Bug 94186] Immediate crash when launching World of Warcraft with RV790

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94186

            Bug ID: 94186
           Summary: Immediate crash when launching World of Warcraft with
                    RV790
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: rankincj at googlemail.com
        QA Contact: dri-devel at lists.freedesktop.org

Warcraft has suddenly started to crash on launch with git Mesa on my RV790.
Bisection has identified this commit:

61ed09c7ea41e559219c772f18ea00942d54d30a is the first bad commit
commit 61ed09c7ea41e559219c772f18ea00942d54d30a
Author: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Date:   Mon Jan 4 23:56:08 2016 +0100

    gallium/cso: add support for compute shaders

    Changes from v2:
     - removed cso_{save,restore}_compute_shader() functions and the
       compute_shader_saved variable because disabling compute shaders for
       meta ops is not currently needed

However, I'm not sure I trust bisection here because I have built Mesa from
this revision *twice* and while WoW always crashes with one build, it never
crashes with the other?!

WoW's crash dump only implies that Mesa is trying to read from a null pointer;
I can find no useful stack trace.

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