[Bug 106005] KWin shadows occasionally corrupt, only fixed after a full-screen redraw

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106005

            Bug ID: 106005
           Summary: KWin shadows occasionally corrupt, only fixed after a
                    full-screen redraw
           Product: Mesa
           Version: 18.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: fdbugs at fratti.ch
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 138800
  --> https://bugs.freedesktop.org/attachment.cgi?id=138800&action=edit
Screenshot of the bug in action, with some sensitive info blacked out to
protect the innocent

Occasionally, the window shadows of a window in KWin exhibit a strange
corrupted pattern, which flickers depending on (I believe?) cursor movement and
disappears when the screen is fully redrawn (e.g. after taking a screenshot in
Spectacle, or toggling compositing off and back on)

00:02.0 VGA compatible controller: Intel Corporation HD Graphics 620 (rev 02)
Mesa version: 18.0.0
kwin 5.12.4 running on X11

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