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port-i386/49168: auich crash the system

>Number:         49168
>Category:       port-i386
>Synopsis:       auich crash the system
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Aug 31 12:25:00 +0000 2014
>Originator:     Adrian Christiansen
>Release:        6.1.4
NetBSD farnsworth.hemma 6.1.4 NetBSD 6.1.4 (GENERIC) i386

IBM Thinkpad T23 type 2647
Booting a NetBSD kernel with auich enabled on a Thinkpad T23 will crash the 
system. The specific model is a T23 type 2647 with an Intel 82801CAM with AC'97 
sound feeding into a Cirrus Logic CS4299 AC'97 codec.

The system is unresponsive to Ctrl-Alt-ESC or anything other than a forced 
power off.
Boot the system with auich enabled.

Booting the kernel using the debug flag, boot -d, will give the following 

fatal breakpoint trap in supervisor mode
trap type 1 code 0 eip c0267794 cs 8 eflags 202 cr2 0 ilevel 8
Stopped in pid 0.1 (system) at netbsd:breakpoint+0x4: popl    %ebp
A poor work-around is to disable auich either by recompiling the kernel with 
that option commented out, or by booting the system with boot -c and using the 
userconf to disable auich (have to be done on each boot).

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