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Date:      Tue, 09 Feb 1999 18:27:36 -0800
From:      Mike Smith <mike@smith.net.au>
To:        Rahul Dhesi <dhesi@rahul.net>
Cc:        freebsd-stable@FreeBSD.ORG
Subject:   Re: Spontaneous reboots 
Message-ID:  <199902100227.SAA02049@dingo.cdrom.com>
In-Reply-To: Your message of "Tue, 09 Feb 1999 18:26:06 PST." <199902100226.AA08300@waltz.rahul.net> 

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> The next time the machine rebooted, I happened to have a video display
> connected to it and I happened to be nearbuy, and I saw the error
> message 'page fault in kernel mode" (or something similar).  I had to
> run elsewhere while this was going on, so I missed the display during
> the filesystem sync and reboot that followed. 

Ack.  The details associated with the pagefault in conjunction with 
your kernel would be critical in tracking this down.

> BTW, SunOS does not require crash dumps to be enabled in order to find
> out the reason for the crash.  SunOS logs a kernel backtrace into
> /var/log/messages after each panic.  I don't think FreeBSD does.  It
> would be nice if the panic message and a stack dump could be saved
> whether or not a full crash dump is being saved.

FreeBSD tries to save the kernel message buffer over reboots, but your 
BIOS may be overwriting these.  For obvious reasons, you can't expect 
to be able to write to the filesystem after a panic, and in some cases 
dumps can't be performed because the disk code is dead...


-- 
\\  Sometimes you're ahead,       \\  Mike Smith
\\  sometimes you're behind.      \\  mike@smith.net.au
\\  The race is long, and in the  \\  msmith@freebsd.org
\\  end it's only with yourself.  \\  msmith@cdrom.com



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