FreeBSD-15 kernel panic when the amdtemp device is in the kernel

From: Gary Jennejohn <garyj_at_gmx.de>
Date: Fri, 01 Sep 2023 11:03:14 UTC 
I have a laptop wioth a AMD Ryzen 5 and a tower with a AMD Ryzen 7 3700X.

These are respectively Zen 1 and Zen 2 CPUs.

I built a kernel on both computers using the FreeBSD-15 source tree.

If I include the amdtemp device in my kernel file BOTH computers end up
with a kernel panic while trying to attach the amdtemp device.

If I remove amdtemp both computers boot without any issues.

I suspect that this commit is the cause:

commit 323a94afb6236bcec3a07721566aec6f2ea2b209
Author: Akio Morita <akio.morita@kek.jp>
Date:   Tue Aug 1 22:32:12 2023 +0200

    amdsmn(4), amdtemp(4): add support for Zen 4

    Zen 4 support, tested on Ryzen 9 7900

    Reviewed by:    imp (previous version), mhorne
    Approved by:    mhorne
    Obtained from:  http://jyurai.ddo.jp/~amorita/diary/?date=20221102#p01
    Differential Revision:  https://reviews.freebsd.org/D41049

--
Gary Jennejohn