[Bug 267028] graphics/drm-510-kmod: General protection fault immediately after kldload amdgpu

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267028

            Bug ID: 267028
           Summary: graphics/drm-510-kmod: General protection fault
                    immediately after kldload amdgpu
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11@FreeBSD.org
          Reporter: george@m5p.com
             Flags: maintainer-feedback?(x11@FreeBSD.org)
          Assignee: x11@FreeBSD.org

Created attachment 237279
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=237279&action=edit
/var/crash/core.txt.1 crash description

It doesn't happen every time.  If I use kld_list="amdgpu" in /etc/rc.conf, it
happens close to 50% of the time.  If instead I boot to single user mode and
manually kldload amdgpu, it happens maybe 20% of the time.  If I have
amdgpu_load="YES" in /boot/loader.conf, the module fails to load at all,
without saying anything.

FreeBSD 13.1-RELEASE-p2, drm-510-kmod-5.10.113_7, AMD Ryzen 3 2200G with Radeon
Vega Graphics.

Crashes are always general protection fault panics, replete with complaints
about drm_modeset_is_locked being false.

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