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Subject: Re: 2.6.18: Kernel BUG at mm/rmap.c:522
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Andre Noll <maan@systemlinux.org>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>, linux-mm@kvack.org,
       linux-kernel@vger.kernel.org, andrea@suse.de, riel@redhat.com
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Date: Wed, 04 Oct 2006 17:49:00 +0200
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On Wed, 2006-10-04 at 17:42 +0200, Andre Noll wrote:
> On 23:59, Nick Piggin wrote:
> 
> > Ah, this old thing. I hope it is repeatable?
> 
> Well, it happened on both of the new machines we got last week. One
> of these is still up BTW and I'm able to ssh into it.
> 
> > What we really want is the bit before this, the "Eeek! page_mapcount went
> > negative" part.
> 
> There's no such message in the log. The preceeding lines are just normal
> startup messages:
> 
> 	Adding 16779852k swap on /dev/sda1.  Priority:42 extents:1 across:16779852k
> 	Adding 16779852k swap on /dev/sdb1.  Priority:42 extents:1 across:16779852k
> 	process `syslogd' is using obsolete setsockopt SO_BSDCOMPAT
> 
> > It is also nice if we can work out where the page actually came from. The
> > following attached patch should help out a bit with that, if you could
> > run with it?
> 
> Okay. I'll reboot with your patch and let you know if it crashes again.

enable CONFIG_DEBUG_VM to get that.