https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295528
Bug ID: 295528
Summary: FreeBSD 15.1-RC1: freebsd-update upgrade from
15.0-RELEASE triggers boot loop / Kernel Panic on
systems with amdgpu (drm-66-kmod) due to ABI mismatch
during stage 1 reboot
Product: Base System
Version: 15.1-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
Environment:
* OS: FreeBSD 15.0-RELEASE upgrading to 15.1-RC1 via freebsd-update.
* Hardware: AMD GPU (using drm-kmod and gpu-firmware-kmod).
* Storage: ZFS with Boot Environments (zroot).
Steps to reproduce:
1. Run `freebsd-update fetch`.
2. Run `freebsd-update upgrade -r 15.1-RC1`
2. Run `freebsd-update install` to install the stage 1 (new kernel).
4. Keep `kld_list="amdgpu"` active in /etc/rc.conf.
5. Reboot the system.
Expected behavior:
The system should boot into a text console using the new 15.1-RC1 kernel,
allowing the user to run the second stage of `freebsd-update install` and
upgrade userland packages (`pkg upgrade`) to resolve kernel module
dependencies.
Actual behavior:
During the boot process, the system attempts to load the old 15.0-compiled
`amdgpu.ko` module from /boot/modules/. Due to kernel ABI mismatch between 15.0
and 15.1-RC1, the kernel panics immediately ("loading kernel modules amdgpu" is
shown, screen blanks, and the machine enters an infinite boot loop).
Workaround found:
Booting via LiveCD, importing the ZFS pool, and commenting out
`#kld_list="amdgpu"` in /etc/rc.conf allows the 15.1-RC1 kernel to boot
successfully into a text-only console to complete the upgrade.
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