[Bug 107747] [Intel GFX CI] spec at arb_texture_multisample@sample-position at 4 intermittently fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107747

            Bug ID: 107747
           Summary: [Intel GFX CI]
                    spec at arb_texture_multisample@sample-position at 4
                    intermittently fail
           Product: Mesa
           Version: 18.0
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: martin.peres at free.fr
        QA Contact: intel-3d-bugs at lists.freedesktop.org

On pig-snb-2600, we started seeing intermitent failures for the test
spec at arb_texture_multisample@sample-position at 4:

.../piglit/bin/arb_texture_multisample-sample-position 4 -auto -fbo

Stderr  
sample 0 position incorrect (y axis): observed 0.093750, expected 0.125000
sample 1 position incorrect (y axis): observed 0.093750, expected 0.375000
sample 2 position incorrect (y axis): observed 0.093750, expected 0.625000
sample 3 position incorrect (y axis): observed 0.093750, expected 0.875000

This never happened before, but it just happened twice yesterday, 3 hours
appart, which suggests something has changed. Given that we only changed the
kernel, it is possible that this would be a kernel change that led to this
instability, but I fail to see how it could happen as this is supposed to be
fixed functions...

This is why I wrote the bug for mesa, waiting for your input!

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