Bug 250072

Summary: graphics/drm-fbsd12.0-kmod: panic: !list_empty(&fence->cb_list) failed
Product: Ports & Packages Reporter: Pascal Abresch <nep>
Component: Individual Port(s)Assignee: freebsd-x11 (Nobody) <x11>
Status: Closed Overcome By Events    
Severity: Affects Only Me CC: manu, zeising
Priority: --- Keywords: crash
Version: Latest   
Hardware: Any   
OS: Any   
Attachments:
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Description Pascal Abresch 2020-10-03 13:30:15 UTC 
Created attachment 218490 [details]
core file text

Occured while running hikari on X11 with love2d and love2d on X11 directly
Comment 1 Mark Linimon freebsd_committer freebsd_triage 2020-10-04 03:43:31 UTC 
From original Summary:

BUG ON !list_empty(&fence->cb_list) failed at /wrkdirs/usr/ports/graphics/drm-fbsd12.0-kmod/work/kms-drm-99da0ba/linuxkpi/gplv2/include/linux/dma-fence.h:91
Comment 2 Niclas Zeising freebsd_committer freebsd_triage 2020-10-05 08:01:54 UTC 
Hikari is a Wayland compositor.  How can you run that on X11?
Comment 3 Niclas Zeising freebsd_committer freebsd_triage 2020-10-05 08:02:41 UTC 
Duplicate of 250070 ?
Comment 4 Jan Beich freebsd_committer freebsd_triage 2020-10-05 14:07:24 UTC 
(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.
Comment 5 Pascal Abresch 2020-10-05 15:55:47 UTC 
I opened this second ticket becase the error message is more explicit, i have quite a number of page faults but this one had a specific assert beeing triggered, so i do not consider it a dupe. :)
Comment 6 Emmanuel Vadot freebsd_committer freebsd_triage 2021-11-19 14:49:18 UTC 
drm-fbsd12-kmod isn't maintained, please try FreeBSD 13 and re-open this bugs if this is still happening.