Endless Reboot after Update 15.0 to 15.1, bricked on reboot after rollback

[kennethcf]

I just had a catastrophic failure of the worst kind and am not quite sure what I should do.
Any help would be appreciated.

I just upgraded from 15.0 to 15.1 after applying latest security patches and rebooting.
# freebsd-update -r 15.1-RELEASE upgrade
It got stuck in a reboot cycle. Last I remember were lots of drm error messages, then reboot.
On one of the reboot cycles, I selected the previous kernel, which worked.
I executed a rollback.
# freebsd-update rollback
I got no errors, so I shutdown -r now
That was the last I saw of my system.
After rebooting, the console eventually stopped on
Loader variables:
vfs.root.mountfrom=zfs:zroot/ROOT/default
Manual root filesystem specification:
<fstype>:<device> [options]
Mount <device> using filesystem <fstype>
and with the specified (optional) option list.
e.g. ufs:/dev/da0s1a
zfs:zroot/ROOT/default
cd9660:/dev/cd0 ro
(which is equivalent to: mount -t cd9660 -o ro /dev/cd0 /)
? List valid disk boot devices
. Yield 1 second (for background tasks)
<empty line> Abort manual input
mountroot>

UPDATE
Apparently, the above is the result of the "freebsd-update rollback" not rolling back the kernel. It still boots into the new kernel.
I hit return to "Abort manual input" and after another message about not finding a partition, it finally restarted and I could select the old kernel. I guess I am not bricked. But I do need to remove the new kernel.

Anyone have a link to a post on removing a new kernel from the boot options and restoring the old kernel as the default?

I think I'm going to have to go through this again if I am to find out what is going on with drm and why the reboots. Am I forever stuck on 15.0?

 

[MG]

A 15.1 kernel crashes without panic message? I had that with 15.1RC2 but it doesn't happen with the finished 15.1.
But what computer is this? If it supports USB boot, you can check if the installer kernel works to make sure that's the problem. You can also change things on an installed system with the live shell, like faulty /etc/fstab settings.

 

[kennethcf]

Thanks MG. I don't know if it actually panicked, or it just rebooted.

It is an AOOStar Gem12 Mini AMD Ryzen9 6900HX w/internal Radeon 680M. After being replaced for not turning on, it has been pretty stable. Yes, it supports USB boot. I had to install drm-515-kmod to get the graphics to work on 14.1 and had to change to drm-66-kmod when I moved from FreeBSD 14.1 to 15.0. See https://forums.freebsd.org/threads/...n-cpu-and-gpu-7-8-9-family.85401/#post-752347

Additional update - Things are not exactly perfect after a rollback and booting into kernel.old. I don't know if I need to be worried or do an update of security patches again and all will be well.
freebsd-version -k --> 15.0-RELEASE-p6
freebsd-version -u --> 15.0-RELEASE-p6
uname -r --> 15.0-RELEASE-p10

I noted problems with drm on other posts with 15.0 STABLE a couple of months back and I wonder if this is related or similar. Maybe 15.1 requires drm-66-kmod to be compiled on a 15.1 system from source before it works? I'll work on this in the morning.