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From: John Baldwin <jhb@freebsd.org>
To: freebsd-stable@freebsd.org
Subject: Re: System doesn't dump
Date: Thu, 30 May 2013 09:02:29 -0400
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 (bigwig.baldwin.cx); Thu, 30 May 2013 09:11:16 -0400 (EDT)
Cc: Dominic Fandrey <kamikaze@bsdforen.de>
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On Wednesday, May 29, 2013 2:41:38 am Dominic Fandrey wrote:
> I have a number of actions that reliably panic the system, such as
> performing shutdown -p (yes I'm booting into an inconsistent file
> system every time). Both with my notebook and my workstation.
> 
> However I cannot get the system to dump.
> 
> dumpdir=/var/crash
> and I've tried ada0s2b, /dev/ada0s2b, label/5swap, /dev/label/5swap and AUTO
> for dumpdev to no avail.
> 
> The swap partition is 16g, the machines have 8g RAM and there's plenty
> of hard disk space available for /var/crash.
> 
> I'm looking for that secret, undocumented trigger, that makes the
> system dump if a panic occurs. Once upon a time dumping just worked
> if the swap partition was large enough. I miss those olden days.

Does /dev/dumpdev exist and point to your swap partition after booting?

-- 
John Baldwin