From mboxrd@z Thu Jan  1 00:00:00 1970
From: Cong Wang <xiyou.wangcong@gmail.com>
Subject: Re: How to get trace during crash?
Date: Wed, 01 Feb 2012 10:07:50 +0800
Message-ID: <4F289E76.8070103@gmail.com>
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Cc: linux-btrfs <linux-btrfs@vger.kernel.org>
To: Chester <somethingsome2000@gmail.com>
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On 02/01/2012 02:04 AM, Chester wrote:
> In the event of a filesystem crash, how do I extract the debugging
> info for the mailing list? My attempts to SSH into the machine are
> unresponsive.
>

In this case, probably you need netconsole, see 
Documentation/networking/netconsole.txt for details.