Re: git: cd61eb4f6681 - main - zfs: Wire sha512 offload to the build

Hi Alan,

On Fri, Jul 03, 2026 at 12:08:47PM -0600, Alan Somers wrote:
> On Thu, Jul 2, 2026 at 12:02 PM Alexander Motin <mav@freebsd.org> wrote:
> >
> > The branch main has been updated by mav:
> >
> > URL: https://cgit.FreeBSD.org/src/commit/?id=cd61eb4f6681b13d98b6a7be252500ad30f05f74
> >
> > commit cd61eb4f6681b13d98b6a7be252500ad30f05f74
> > Author:     Alexander Motin <mav@FreeBSD.org>
> > AuthorDate: 2026-07-02 17:58:12 +0000
> > Commit:     Alexander Motin <mav@FreeBSD.org>
> > CommitDate: 2026-07-02 17:58:12 +0000
> >
> >     zfs: Wire sha512 offload to the build
> >
> >     FreeBSD main just got the CPUID_STDEXT4_SHA512 define.
> >
> >     OpenZFS PR #18732
> 
> This commit breaks boot for me.  The kernel can't open the zroot pool,
> leading to the familiar mountroot> prompt.  And in a UFS-root VM, I
> can't load the ZFS kernel module.  It fails with:
> 
> link_elf_obj: symbol zfs_sha512_transform_sha512ext undefined
> linker_load_file: /boot/kernel/zfs.ko - unsupported file type
> 
> On both systems, the CPU is a Ryzen 9 5950X, which does not support AVX-512.
> 
> Could we please revert the change for now?

+1 from my side.

Even booting the old kernel doesn't work as usual. I have to manually unload
all modules, load the old kernel and then load the old zfs module to get my
development machine booting.

I have reverted this change locally and did a fresh build and everything went back
to normal.

--Gordon