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To: Andy Pfiffer <andyp@osdl.org>
Cc: suparna@in.ibm.com, linux-kernel@vger.kernel.org,
       lkcd-devel@lists.sourceforge.net, fastboot@osdl.org
Subject: Re: [Fastboot] Re: Kexec on 2.5.59 problems ?
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From: ebiederm@xmission.com (Eric W. Biederman)
Date: 10 Feb 2003 11:07:06 -0700
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Andy Pfiffer <andyp@osdl.org> writes:

> On Mon, 2003-02-10 at 03:14, Suparna Bhattacharya wrote:
> > I am using the OSDL versions of the kexec patches for
> > 2.5.59 (plm 1442 and 1444) for lkcd-kexec based crash dump
> > work.
> 
> <snip>
> 
> > 
> > Surprisingly though, when I tried just a simple 
> > kexec -e today (having loaded the kernel earlier on), 
> > I ran into the following Oops, consistently:
> > 
> > I'm using kexec-tools-1.8, and this has worked for me
> > earlier. The test system is a 4way SMP machine.
> > 
> > Has anyone seen this as well ?  (I'd already issued init 1 
> > and unmounted filesystems by this point)

Hmm.  Would love to know which cpu this is on...

I think the primary candidate if this only occurs in smp is
the switch_mm.  It may be that modifying the init_mm is not safe,
or it gets zapped somewhere else.

As soon as I get distractions in other directions under control
I will take a look.

Eric
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