[Bug 101565] Intermittent graphical corruption since "radeonsi: don't emit partial flushes at the end of IBs (v2)" (c9040dc9)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101565

            Bug ID: 101565
           Summary: Intermittent graphical corruption since "radeonsi:
                    don't emit partial flushes at the end of IBs (v2)"
                    (c9040dc9)
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: greg at chown.ath.cx
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 132156
  --> https://bugs.freedesktop.org/attachment.cgi?id=132156&action=edit
Example of graphical corruption

Commit c9040dc9 seems to cause graphical corruption on VI for me. It looks like
some caching issue, since the corruption is intermittent and mostly appears
only for a single frame. Maybe some assumptions made about the kernel's
handling of IBs aren't true?

I can trigger issues reliably by running some OpenCL load in the background
(for instance, an Ethereum miner). That will make X (glamor) and gnome-shell
rendering glitch randomly with high probability.

Reverting the commit fixes the problem completely.

Attached is a screenshot, showing what kind of artefacts I encounter. (Using
the screenshot tool doesn't work as it'll rerender everything before capture)

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