From mboxrd@z Thu Jan  1 00:00:00 1970
From: Lyndon Nerenberg <lyndon@orthanc.ca>
To: 9fans@9fans.net
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Content-ID: <94188.1555552055.1@orthanc.ca>
Date: Wed, 17 Apr 2019 18:47:35 -0700
Message-Id: <fd2fd1ab411573f9@orthanc.ca>
Subject: [9fans] SMC SYS-5018A-FTN4 lapic weirdness (9front)
Topicbox-Message-UUID: faaef204-ead9-11e9-9d60-3106f5b1d025

I have a stack of Supermicro SYS-5018A-FTN4 servers upon which  I'm trying to
spin up 9front.

For the most part they work, but one annoyance is the *endless* stream of

  cpu0: lapicerror: 0x00000080

messages the kernel prints out.  Sometimes these originate from cpu1 as well.
The hardware has eight CPU cores.  I don't think I've seen anything from
cpu>1, but in the blizzard of messages, who knows.

I poked a wee bit inside the kernel source, but I don't have time right now
to chase this.  The hardware runs fine, other than refusing to reboot, which
I put down to the usual BIOS ACPI table stupidity.

For the time being I'm going to put a filter on the kprints, but I'm curious
if this sounds familiar to anyone.

Note this happens with both the 32- and 64-bit kernels.

I don't have a quick way to attach sysinfo(1) to this message, but if somebody
can use that I'll figure something out.

--lyndon