[Bug 295528] FreeBSD 15.1-RC1: freebsd-update upgrade from 15.0-RELEASE triggers boot loop / Kernel Panic on systems with amdgpu (drm-kmod) due to ABI mismatch during stage 1 reboot

In reply to: bugzilla-noreply_a_freebsd.org: "[Bug 295528] 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"
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From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 24 May 2026 06:05:06 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295528

--- Comment #2 from jimm popkow <jimmbird2068@gmail.com> ---
Thanks for the insights! 

Yes, booting into single-user mode (`boot -s`) is a much cleaner workaround
than using a LiveCD, I will keep that in mind for the future.

However, the fact that the 15.0-compiled amdgpu.ko was actually executed by the
15.1-RC1 kernel instead of being rejected by the "tied modules" mechanism shows
there is indeed a bug or a loophole in how kernel module ABI compatibility is
currently checked during major/minor upgrades when loaded via kld_list.(In
reply to Warner Losh from comment #1)

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