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Date: Fri, 27 Jul 2007 14:52:42 +0100
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To: Zhang hw <zhhw210095@gmail.com>
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From: Adam J Richardson <fatman.uk@gmail.com>
Cc: freebsd-questions@freebsd.org
Subject: Re: panic : swap_pager
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Hi,

> Cannot dump. No dump device defined.

At least I know what this means. If you don't define a dump device, the 
swapper can't dump the corrupted swap data anywhere so you can analyse 
it later. Rather than explain here I recommend you, and everyone else in 
fact, read and digest these tutorials.

http://www.onlamp.com/pub/a/bsd/2002/03/21/Big_Scary_Daemons.html
http://www.onlamp.com/pub/a/bsd/2002/04/04/Big_Scary_Daemons.html

They're a little out of date but still work perfectly well. I managed to 
help Ben Close stomp a bug in the wpi driver after reading these 
tutorials. All hail Michael Lucas. :P

HtH
Adam J Richardson