On 10/11/2009 05:41 PM, Rafael J. Wysocki wrote:

[Note:
  10 new reports in the last 10 days, but fortunately we're fixing them faster
  than they're being reported.]

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=14181
Subject		: b43 causes panic at ifconfig down / shutdown
Submitter	: Jeremy Huddleston [off-list ref]
Date		: 2009-09-15 18:34 (27 days old)

A patch to fix this one is in the hands of the OP. It should be tested
within the next couple of days.

Larry