https://bugs.kde.org/show_bug.cgi?id=374369

            Bug ID: 374369
           Summary: Panel freezes with compositing enabled and displays
                    out-of-date content
           Product: plasmashell
           Version: 5.8.4
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Panel
          Assignee: plasma-b...@kde.org
          Reporter: danielk...@gmail.com
  Target Milestone: 1.0

Created attachment 103104
  --> https://bugs.kde.org/attachment.cgi?id=103104&action=edit
Screenshot (icons blurred for privacy)

After some amount of time (or due to some circumstance I cannot determine), the
panel will "freeze", and get stuck displaying a very old image (from hours
ago). Icons will no longer be updated or highlighted, but interaction works -
clicking in the areas corresponding to the icons works fine, and even
attempting to change panel settings works, but it *does not* make the panel
update correctly.

Compositing is enabled, with KWin set to OpenGL (tried both 2.0 and 3.1).
Setting vsync to automatic, full or cheap doesn't change anything (haven't
tried XRender or other vsync settings yet).

A screenshot demonstrating the issue is attached.

System setup:

Fedora 25 x86_64
Plasma 5.8.4
KDE Frameworks 5.27.0
Qt 5.7.1
Linux 4.8.15
NVIDIA proprietary drivers (375.26)

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