[Bug 251736] [panic] memcpy_erms general protection fault on AMD Zen 3 (Ryzen 5000 series)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251736

Greg V <greg at unrelenting.technology> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |Closed
         Resolution|---                         |Not A Bug

--- Comment #8 from Greg V <greg at unrelenting.technology> ---
Closing as there's no ERMS bug, but it seems that there is *some* bug causing
wild instability on these CPUs that was added in the last couple months.

Testing log:

- turned off all overclocking (even XMP, RAM is 2400MHz now) just to be sure,
turned off ERMS, basically running stock firmware settings
- everything seems perfectly stable on a kernel from September
- rebuilt current kernel cleanly (erasing /usr/obj and ccache), unstable
- rebuilt it with llvm10, unstable
- rebuilt it without CPUTYPE, unstable
- rebuilt the exact git revision of the September kernel, fine!

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