[Bug 288607] MCA kernel panic on non-existent BANK 8

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 08 Aug 2025 16:35:23 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288607

John Baldwin <jhb@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jhb@FreeBSD.org
         Resolution|---                         |Not A Bug
             Status|New                         |Closed

--- Comment #3 from John Baldwin <jhb@FreeBSD.org> ---
The MCA bank doesn't mean "RAM" or "DIMM" bank.  It indicates which register is
reporting the error (MCA uses different banks of registers to report different
types of errors, and the mapping of errors to banks is vendor-specific and also
uarch-specific).  So dmidecode isn't useful here, mcelog from ports (which
should support AMD) is the only tool that can provide more details than is in
dmesg, but often it doesn't provide any more detail.

The bits decoded in dmesg do indicate an uncorrected checksum error in your
CPU's instruction-cache.  That would generally be a hardware failure.  Software
can't really trigger ECC errors inside the CPU die.

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