[Bug 250193] Kernel panic loading DRM kmods

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250193

Hans Ottevanger <hans at beastielabs.net> changed:

           What    |Removed                     |Added
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                 CC|                            |hans at beastielabs.net

--- Comment #5 from Hans Ottevanger <hans at beastielabs.net> ---
(In reply to Jason W. Bacon from comment #4)

I can confirm that this also happens on my Core-2 Quad system, with a Radeon
HD-6450 based graphics card.

When using the drm-fbsd12.0-kmod-4.16.g20200221 package on 12.1-RELEASE-p10
everything works as usual. After upgrading to 12.2-RC3 the system panics
immediately on loading radeonkms.ko. I still get a stacktrace, but it is
followed by a hard hangup, so no core dump is made.

It does not matter whether I put

kld_list="/boot/modules/radeonkms.ko"

in /etc/rc.conf or run

kldload /boot/modules/radeonkms.ko

directly from the shell.

When I build drm-fbsd12.0-kmod-4.16.g20200221 locally from ports, the problem
does not occur and the systems functions normally.

I wonder what an end user gets to see when installing 12.2-RELEASE once it is
available and then attempts to use the package.

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