kern/57063: Kernel panic in -current in iic_attach

[brad%anduin.eldar.org@localhost]

>Number:         57063
>Category:       kern
>Synopsis:       Kernel panic in -current in iic_attach
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Oct 17 17:50:00 +0000 2022
>Originator:     brad%anduin.eldar.org@localhost
>Release:        NetBSD 9.99.101
>Organization:
	eldar.org
>Environment:
System: NetBSD anduin.eldar.org 9.99.101 NetBSD 9.99.101 (XEN3_DOM0) amd64
Architecture: x86_64
Machine: amd64
>Description:

NetBSD-current panics on a AsRock Rack E3C246D2I motherboard with a
Intel Xeon E-2224 cpu.  The panic occurs before the USB keyboard
attaches so it is next to impossible to use DDB.

A video pulled from the BMC is available here:

http://www.netbd.org/~brad/public_html/video_17-10-2022_13-13-51_part1.avi

As best as I can tell the panic in the iic_attach routine for dwiic.

>How-To-Repeat:

Try -current on mentioned motherboard.  NetBSD 9.2_STABLE works fine.

>Fix:

Unknown.  Hopefully something simple.  I am currently building a
kernel without dwiic to see if that doesn't panic.