[Bug 250072] graphics/drm-fbsd12.0-kmod: panic: !list_empty(&fence->cb_list) failed

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250072

--- Comment #4 from Jan Beich <jbeich at FreeBSD.org> ---
(In reply to Niclas Zeising from comment #2)
> Hikari is a Wayland compositor.  How can you run that on X11?

Via wlroots X11 backend. It works similar to Xephyr/Xnest but
hardware-accelerated: running Hikari on X11 would create a window where one can
manage Wayland and X11 clients according to Hikari rules. Such nesting isn't
limited by depth but at some point performance may degrade e.g., on Skylake
under Xorg "cage cage cage cage vkcube-wayland" runs with 60FPS but adding
another "cage" drops to 45FPS.

See also
https://old.reddit.com/r/linux_gaming/comments/iudig1/gamescope_continues_advancing_as_waylandvulkan/

(In reply to Niclas Zeising from comment #3)
> Duplicate of 250070 ?

Likely different panic/backtrace on the same radeonkms version. Confirming on
5.4-lts would be nice but until drm-fbsd12.2-kmod or similar appears it'd
require upgrading to -CURRENT.

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