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Date:      Wed, 13 Mar 2002 14:42:33 -0700
From:      Nate Williams <nate@yogotech.com>
To:        dochawk@psu.edu
Cc:        nate@yogotech.com (Nate Williams), freebsd-mobile@FreeBSD.ORG
Subject:   Re: init 1 causes panic on A21p and A22m 
Message-ID:  <15503.51145.499114.537234@caddis.yogotech.com>
In-Reply-To: <200203132138.g2DLc5T00692@fac13.ds.psu.edu>
References:  <15503.46021.471159.480323@caddis.yogotech.com> <200203132138.g2DLc5T00692@fac13.ds.psu.edu>

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> > > I just tried it without X, and got the same thing.  It's a page read 
> > > failure in supervisor mode.
>  
> > You may need to get a back-trace.  It sounds like you're get a NULL
> > pointer exception.  Can you try a minimal boot (no X, no other programs
> > runningg, etc..) and see if it's related to some program that's running.
> 
> I did this with /usr and /home set to ro in fstab (they take forever to 
> fsck, even with soft updates), and xdm disabled.  It still happened.

Can you just for kicks try booting into single-user mode and then
shutdown down to see if something happens.

Hit a key at boot up, and then type 'boot -s'.  Once it comes up, hit
return at the /bin/sh prompt, and then type 'reboot'.

> How do I backtrace a kernel panic?  I think I have a gig of swap with a 
> hlaf-gig of ram, but I don't know how to cause the dump (or what to do 
> with it).

See the handbook section on kernel debugging.  You'll need to setup your
swap device in /etc/rc.conf to something:

dumpdev="/dev/ad0s1b"

(It should be the same as your swap partition.

> > This is happening on two different hardware boxes, right?  If it wasn't
> > happening on two different boxes, I would suspect a hardware issue.
> 
> Two boxes--but the same hard drive.

It may be completely unrelated to the hard drive.


Nate

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