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Date:      Wed, 30 Mar 2005 06:27:56 -0800
From:      Kris Kennaway <kris@obsecurity.org>
To:        Rene Ladan <r.c.ladan@student.tue.nl>
Cc:        Kris Kennaway <kris@obsecurity.org>
Subject:   Re: 5.4pre panic
Message-ID:  <20050330142756.GA82796@xor.obsecurity.org>
In-Reply-To: <20050330141707.GA2020@82-168-75-155-bbxl.xdsl.tiscali.nl>
References:  <20050330101123.GA641@82-168-75-155-bbxl.xdsl.tiscali.nl> <20050330135103.GB66640@xor.obsecurity.org> <20050330141707.GA2020@82-168-75-155-bbxl.xdsl.tiscali.nl>

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On Wed, Mar 30, 2005 at 04:17:08PM +0200, Rene Ladan wrote:
> On Wed, Mar 30, 2005 at 05:51:04AM -0800, Kris Kennaway wrote:
> > On Wed, Mar 30, 2005 at 12:11:23PM +0200, Rene Ladan wrote:
> > > Got this panic with auto-reboot (no dump :(  ), saved from dmesg on
> > > 5.4pre 2003-05-29 09:49 UTC
> > >=20
> > > processor eflags	=3D IOPL =3D 0
> > > current process		=3D 29 (swi1: net)
> > > trap number		=3D 3
> > > panic: breakpoint instruction fault
> >=20
> > I'd have expected this panic to be the result of setting a breakpoint,
> > i.e. requesting the kernel to panic at this location.  Are you
> > absolutely certain this is not the case?
> I did not set a breakpoint, maybe some application was doing it for me.
> I was working in X at the moment.
>=20
> > If so, you should try to use
> > DDB to obtain a traceback to find out what it was doing.
> I have DDB/KDB in my kernelconfig, but auto-reboot without dump doesn't
> help much, does it?

The point is to disable "auto-reboot" (I assume you mean
DDB_UNATTENDED?) and obtain the traceback manually from the ddb prompt
when it panics.

Kris

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