[Bug 262972] graphics/drm-fbsd13.0-kmod module radeonkms sometimes freezes system

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 01 Apr 2022 07:24:28 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262972

            Bug ID: 262972
           Summary: graphics/drm-fbsd13.0-kmod module radeonkms sometimes
                    freezes system
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: nkoch@demig.de

Created attachment 232854
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=232854&action=edit
dmesg output, loaded klds, and X-server log

I am testing an embedded board with AMD G-T56N processor and Radeon HD 6300
graphics under FreeBSD13.0/amd64.

Sometimes the system freezes when loading radeonkms.ko. It makes no
difference if I have kld_list="radeonkms" in rc.conf or the kernel module is
loaded when starting the X-server.

I tested drm-fbsd13-0-kmod form packages (5.4.144.g20220128) and the latest
version from ports  (5.4.144.g20220223).

I only made a short test FreeBSD13.0/i386. Here, when I start the X-server it
seems to hang in a syscall as it is unkillable.

The same hardware works without problems with radeonkms.ko under
FreeBSD12.1/i386.

Should I try modifying one of the many related sysctls?

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