[Bug 103976] Regression: Videogame (Wakfu) no longer works with Mesa 17.2 (17.1 works)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103976

            Bug ID: 103976
           Summary: Regression: Videogame (Wakfu) no longer works with
                    Mesa 17.2 (17.1 works)
           Product: Mesa
           Version: 17.2
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: azari4096 at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

A game I play called Wakfu no longer loads at all with Mesa 17.2 while it
worked fine with 17.1

https://www.wakfu.com/en/mmorpg

It's free and there is no need to sign up in order to test it.

The problem occurs when clicking "Play" on the launcher, the game window is
supposed to launch, and instead you either get a crash notice in the launcher,
or you may get the game window but it will instantly lock up and not load the
game, it will just remain blank.

(the different behavior regarding crash or lockup seems to depend on whether
you have LLVM 5 or 4 installed, but it's broken either way when moving to Mesa
17.2)

I've reproduced this on two systems, one with a Radeon HD 4850, and one with a
Radeon HD 6950 (the former is an Intel i7 machine and the latter an AMD FX
machine).

I don't have the ability to test it on other drivers, but it's possible it
occurs on radeonsi too or even other vendor GPUs; it's worth testing even if
you don't have r600 I think, since it may affect all cards.

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