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

From: Alexander Motin <mav_at_FreeBSD.org>
Date: Sat, 04 Jul 2026 09:17:59 UTC 
On 7/3/26 14:08, 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?

I've reverted the commit.  I may not have much time nearest days, so if 
anybody wish to investigate it -- please do.

-- 
Alexander Motin