[Bug 293382] Dead lock and kernel crash around closefp_impl

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293382

--- Comment #65 from Konstantin Belousov <kib@FreeBSD.org> ---
(In reply to Kristofer Peterson from comment #64)
So we have some lead.  There is a public errata document
https://docs.amd.com/v/u/en-US/58251_PUB_1.30

Look for the errata
1567 Instruction State May be Corrupted
during REP CMPSB or REP SCASB
Description

During the execution of a REP CMPSB or REP SCASB, the instruction state may be
corrupted.

Potential Effect on System

Unpredictable system behavior

Suggested Workaround

System software may contain the workaround for this erratum.

Fix Planned
No fix planned

It only says something about cmps and scas, not about movs.  But this is very
close.
Also, the revision is from July 2025, I did not found anything newer.

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