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Date:      Fri, 12 May 2000 09:01:24 +0930
From:      Greg Lehey <grog@lemis.com>
To:        "Brian O'Shea" <boshea@ricochet.net>
Cc:        Marco Molteni <molter@sofia.csl.sri.com>, freebsd-hackers@FreeBSD.ORG
Subject:   Re: kernel panics at boot, how to specify dump device?
Message-ID:  <20000512090124.C10505@freebie.lemis.com>
In-Reply-To: <20000511130359.Y337@beastie.localdomain>
References:  <20000511122038.A99408@sofia.csl.sri.com> <20000511130359.Y337@beastie.localdomain>

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On Thursday, 11 May 2000 at 13:03:59 -0700, Brian O'Shea wrote:
> On Thu, May 11, 2000 at 12:20:38PM -0700, Marco Molteni wrote:
>>
>> I have a 4-STABLE kernel that panics at boot. How do I force the kernel
>> to core dump?
>>
>> I know that the handbook says to build a debug kernel and to set the
>> dump device via (dumpon + /etc/rc.conf) but in this case the kernel
>> panics during booting. The handbook says that, if the kernel panics at
>> boot, one can specify the dump device in the kernel configuration file,
>> with the "config kernel" line. I tried something like
>>
>> config         kernel dump on /dev/wd0s3b
>
>> From the LINT kernel config file:
>
> config		kernel	root on wd0 dumps on wd0

That's not there in 4.0.  I believe most of this was vandalized some
time late last year.

I've been running in to this problem too.  I'm planning to add an
option to ddb where you can specify the dump device at the time where
you want to take the dump.

Marco, where exactly is it panicing?  Do you have ddb in the kernel?

Greg
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