[Mesa-dev] [Bug 103762] [swr] piglit ext_transform_feedback-immediate-reuse-uniform-buffer has a ~5% pass rate

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103762

            Bug ID: 103762
           Summary: [swr] piglit
                    ext_transform_feedback-immediate-reuse-uniform-buffer
                    has a ~5% pass rate
           Product: Mesa
           Version: 17.2
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/swr
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: agomez at igalia.com
        QA Contact: mesa-dev at lists.freedesktop.org

When running the complete "all" profile in piglit against mesa's swr driver,
ext_transform_feedback-immediate-reuse-uniform-buffer most of the time fails,
but not always.

It seems its pass rate is ~5%.

AFAIK, this is not new for 17.2.x not a recent regression.

A typical piglit report is as follows, although varies from failed run to run:


Detail      |   Value
------------+---------------
Returncode  |   1
------------+---------------
Time        |   0:00:00.211612
------------+---------------
Stdout      | Probe color at (224,0)
            |   Expected: 223 31 223
            |   Observed: 0 0 0
            | Probe color at (240,0)
            |   Expected: 239 15 239
            |   Observed: 0 0 0
------------+---------------
Stderr      | WR detected AVX2 
            | vert shader  0x7f492c287000
            | frag shader  0x7f492c285000
            | so shader    0x7f492c283000
            | fetch shader 0x7f492c281000
            | fetch shader 0x7f492c27f000
            | SWR destroy screen!
------------+---------------
Environment | PIGLIT_PLATFORM="mixed_glx_egl"
PIGLIT_SOURCE_DIR="/home/local/piglit"
------------+---------------
Command     |
/home/local/piglit/bin/ext_transform_feedback-immediate-reuse-uniform-buffer
-auto -fbo
------------+---------------
dmesg       |
----------------------------

Environment is an Ubuntu Xenial with custom LLVM packages installed and locally
compiled mesa and mesa dependencies. If needed, I can provide a docker image
with which to test.

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