The following reply was made to PR kern/37400; it has been noted by GNATS.

From: Paul Ripke <stix@stix.id.au>
To: NetBSD gnats-bugs <gnats-bugs@NetBSD.org>
Cc: 
Subject: Re: kern/37400 panic in ath_rate_findrate(): ndx is 0
Date: Fri, 21 Dec 2007 11:20:29 +1100

 Managed to trip over this myself. Occurred exactly at the time I did
 a "sudo ifconfig en1 down up" on a Mac OS X laptop that was peered
 to the NetBSD access point.
 
 Have not tried again to see if it is reproducible.
 
 -- 
 Paul Ripke