On 11/3/2021 6:48 PM, Zev Weiss wrote:

On Wed, Nov 03, 2021 at 08:56:10AM PDT, Jae Hyun Yoo wrote:

quoted

Hi Zev,

Not sure but looks like one of LPC functions is enabled while kernel
booting.

Looks like that was exactly the clue I needed -- obvious in retrospect, 
but I realize now that I'm only seeing this happen when I bypass the 
normal shutdown sequence via 'reboot -f'; with a plain 'reboot' I don't 
hit any problems.  Can you reproduce it that way?

My system doesn't follow the reproduction pattern. What I usually do to
reproduce it is, making a host reset and followed by making a BMC reset
then host will try to send something through KCS channel and snoop-80
while BMC LPC drivers are being loaded. It's not easy to reproduce it
using my system and it's very timing sensitive.

As I suggested in previous email, disable all LPC sub functions and
enable back one by one. It could help for identifying which LPC sub
module causes the issue.

-Jae

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