Kernel panic with drm-515-kmod

Yesterday i installed drm-515-kmod (before i have drm-510-kmod for amdgpu) during play a video in firefox kernel panic occurred.
after multiply reboots system goes to single-user mode. now with drm-510-kmod i doesn't see the panic.

The problem really from drm driver or something else?
 
Which version of FreeBSD, exactly?

freebsd-version -kru ; uname -aKU

Packages of ports from latest, or quarterly?

pkg -vv | grep -e url -e enabled -e priority

Reports of panics are in Bugzilla for FreeBSD, and at:

github.com/freebsd/drm-kmod/issues
 
Many people do have currently issues with the current 5.15 including me.

I do currently use https://github.com/wulf7/drm-kmod/tree/5.15-lts-focal suggested in PR 274770.

It builds fine on RELEASE and STABLE and i do use it now over a week and can say that it works fine (No panics or other drm related issues).

There is working progress to bring this branch to the main 5.15 branch.

 
If it is the drm-515-kmod, the issue could be tested with the same video in a different browser, or even opening the URL with multimedia/mpv. It is also possible that specific video causes trouble. Maybe only in www/firefox, maybe in other browsers.

My line of deduction of errors always starts with:
  1. the file or URL;
  2. the program used;
  3. basic components;
  4. the FreeBSD kernel.

Most trouble is within the first two options.
 
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