[Nouveau] [Bug 68344] [NV50 gallium] [piglit] shaders/glsl-fs-texture2d-dependent-4 randomly passes or fails on NVAA/NV50

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68344

Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[piglit]                    |[NV50 gallium] [piglit]
                   |shaders/glsl-fs-texture2d-d |shaders/glsl-fs-texture2d-d
                   |ependent-4 randomly passes  |ependent-4 randomly passes
                   |or fails on NVAA/NV50       |or fails on NVAA/NV50

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
As a datapoint, I also got it to fail on NV96, similar failure. However for me
it was more like 1/100 times. And I never saw the failure with mesa 9.1.2, only
mesa-git (from a few days ago).

This is how I ran it:

for i in `seq 100`; do bin/shader_runner
tests/shaders/glsl-fs-texture2d-dependent-4.shader_test -auto; done

Here was the failure:

Probe color at (25,225)
  Expected: 0.000000 0.000000 1.000000
  Observed: 1.000000 0.000000 0.000000
Probe color at (225,225)
  Expected: 1.000000 1.000000 1.000000
  Observed: 0.000000 1.000000 0.000000

Note how for me it says ,225 and not ,224. Might be a different piglit test
version... I'm at latest. (Or could be a difference between nv84 3d and nva0
3d.)

This feels like a timing issue -- e.g. we return too early without having
flushed something.

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