[Nouveau] [Bug 96565] New: Clive Barker's Jericho displays strange, vivid colors when motion blur enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96565

            Bug ID: 96565
           Summary: Clive Barker's Jericho displays strange,vivid colors
                    when motion blur enabled
           Product: Mesa
           Version: 11.2
          Hardware: Other
                OS: All
            Status: NEW
          Keywords: bisected, regression
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: gyebro69 at gmail.com
        QA Contact: nouveau at lists.freedesktop.org
                CC: imirkin at alum.mit.edu

Created attachment 124580
  --> https://bugs.freedesktop.org/attachment.cgi?id=124580&action=edit
screenshot

When motion blur effect is enabled in the game, the screen is filled with red,
yellow and green colors (both the menus and midgame).
The problem doesn't exist with the software renderer.

Bisecting revealed that the problem is present since

commit 7752bbc44e78e982de3cd4c34862adc38a338234
Author: Ilia Mirkin <imirkin at alum.mit.edu>
Date:   Thu Dec 10 18:19:44 2015 -0500

    gk104/ir: simplify and fool-proof texbar algorithm

    With the current algorithm, we only look at tex uses. However there's a
    write-after-write hazard where we might decide to, on some path, not use
    a texture's output at all, but instead to write a different value to
    that register. However without the barrier, the texture might complete
    later and overwrite that value.

    This fixes Unreal Elemental demo on GK110/GK208, flightgear on GK10x,
    and likely other random-looking failures.

The game renders properly with the previous commit.

Trace (uncompressed 138M):
https://drive.google.com/open?id=0B-tTbLKBl-tOaVRvNmMwQW8zYlk

OpenGL vendor string: nouveau
OpenGL renderer string: Gallium 0.4 on NV106
OpenGL core profile version string: 4.3 (Core Profile) Mesa 12.1.0-devel
(git-5a64549)
OpenGL core profile shading language version string: 4.30

Fedora 23
Libdrm 2.4.68+git
Linux kernel 4.7.0-rc3

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