[Bug 93648] Random lines being rendered when playing Dolphin on radeonsi (w/ apitrace)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93648

            Bug ID: 93648
           Summary: Random lines being rendered when playing Dolphin on
                    radeonsi (w/ apitrace)
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: delroth at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

We recently setup Dolphin's automated rendering tests on Fiji XT with
Mesa/amdgpu. It started detected a random rendering issue which I think we can
attribute to a driver bug.

See https://fifoci.dolphin-emu.org/compare/1086020-1085934/ . Left side has the
"bad" rendering, right side the "good" rendering.

The issue is properly captured in this apitrace:
http://delroth.net/radeon-unpredictable.trace -- rendering it on my Fiji XT
system shows the lines but rendering it on i965 doesn't.

We have also had reports of users seeing this in action on Pitcairn GPUs:
https://bugs.dolphin-emu.org/issues/9239

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