From owner-freebsd-stable@FreeBSD.ORG  Wed Nov 25 08:35:34 2009
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From: Hans Petter Selasky <hselasky@c2i.net>
To: "Guojun Jin" <gjin@ubicom.com>
Date: Wed, 25 Nov 2009 09:37:06 +0100
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Cc: bugs@freebsd.org, freebsd-stable@freebsd.org, freebsd-usb@freebsd.org
Subject: Re: 8.0-RC USB/FS problem
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On Wednesday 25 November 2009 00:08:59 Guojun Jin wrote:
> What other debug shall we turn on to analyze this problem.

Are you able to extract the panic message? Try enabling dump on the swap 
partition.

--HPS