Turns out that was the issue.  Thanks Manuel! 

-----Original Message-----
From: Manuel Bouyer [mailto:bouyer@antioche.eu.org] 
Sent: Wednesday, October 15, 2003 1:06 PM
To: scotte@warped.com
Cc: gnats-bugs@gnats.netbsd.org; netbsd-bugs@netbsd.org
Subject: Re: kern/23163: 1.6ZD hangs during drive probe

On Wed, Oct 15, 2003 at 02:37:28AM -0000, scotte@warped.com wrote:
> fd0 at fdc0 drive 0: 1.44MB, 80 cyl, 2 head, 18 sec atapibus0 at 
> atabus0: 2 targets atapibus0 drive 0: <_NEC DV-5700A, , 1.91> cdrom 
> removable not configured

In fact it may be related to the "not configured" here.
It paniced on my sparc64 in this case.
Please try wdc.c 1.140 and atapi_wdc.c 1.59

--
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 24 ans d'experience feront toujours la difference
--