Nouveau - Aug 2013 - [Bug 68344] New: [piglit] shaders/glsl-fs-texture2d-dependent-4 randomly passes or fails on NVAA/NV50

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

          Priority: medium
            Bug ID: 68344
          Assignee: nouveau at lists.freedesktop.org
           Summary: [piglit] shaders/glsl-fs-texture2d-dependent-4
                    randomly passes or fails on NVAA/NV50
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: dirkneukirchen at web.de
          Hardware: x86 (IA32)
            Status: NEW
           Version: git
         Component: Driver/nouveau
           Product: xorg

Created attachment 84349
  --> https://bugs.freedesktop.org/attachment.cgi?id=84349&action=edit
normal bootlog

./piglit-run.py -t '/shaders/glsl-fs-texture2d-dependent-4'
tests/quick.tests
results/quick-shaders-single-test.tests 

passes or fails seemingly random
20 passes - 9 fails

Result of fail:
Probe color at (25,224)
  Expected: 0.000000 0.000000 1.000000
  Observed: 1.000000 0.000000 0.000000
Probe color at (224,224)
  Expected: 1.000000 1.000000 1.000000
  Observed: 0.000000 1.000000 0.000000

Hardware:
Nvidia 8200 Onboard NVAA/NV50
nouveau  [  DEVICE][0000:02:00.0] Chipset: MCP77/MCP78 (NVAA)
nouveau  [  DEVICE][0000:02:00.0] Family : NV50

Software:
Linux Mint 15 + xorg-edgers + 3.11-rc5
Kernel: 3.11.0-rc5-vanillaice (compiled)
libdrm-nouveau: 2.4.46+git20130702.c6d73cfe-0ubuntu0sarvatt~raring
xserver-xorg-video-nouveau :
1:1.0.9+git20130730.300c5a32-0ubuntu0sarvatt~raring
mesa: 9.2.0~git20130729+9.2.9b8ad643-0ubuntu0sarvatt~raring

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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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--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Hmmm... I just went and retested this with latest mesa, and I can't get it
to
fail on NV98. There have been a few patches that went in that may affect this
type of issue.

Could you verify that this still happens with mesa-git?

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--- Comment #3 from dirkneukirchen at web.de ---
It will take a while to set up because several other things are not working
with NVAA too and temporary "removal" of the driver in 3.13-rc1 -
3.13-rc3 is
not helping either

see (similar?) NVAA / NVAC:
https://bugs.freedesktop.org/show_bug.cgi?id=72399
and on the mailing list:
http://lists.freedesktop.org/archives/dri-devel/2013-December/050037.html


building with Ubuntu wasnt as nice ... now trying to set up with Fedora

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--- Comment #4 from Ilia Mirkin <imirkin at alum.mit.edu> ---
This could be tested with 3.12 just fine. The commits I was referencing were to
mesa. The important part would be to have a fresh mesa git checkout. (And use
it to run the tests :) )

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Martin Peres <martin.peres at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #5 from Martin Peres <martin.peres at free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
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You can subscribe and participate further through the new bug through this link
to our GitLab instance:
https://gitlab.freedesktop.org/xorg/driver/xf86-video-nouveau/issues/52.

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