linux-kernel - Re: [bug] SLUB + mm/slab.c boot crash in -rc9

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Date:	Tue, 15 Apr 2008 01:31:18 -0700
From:	Yinghai Lu <yhlu.kernel.send@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org, Christoph Lameter <clameter@....com>,
	Mel Gorman <mel@....ul.ie>, Nick Piggin <npiggin@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [bug] SLUB + mm/slab.c boot crash in -rc9

On Tuesday 15 April 2008 12:08:11 am Ingo Molnar wrote:
> 
> * Pekka Enberg <penberg@...helsinki.fi> wrote:
> 
> > On Tue, Apr 15, 2008 at 9:25 AM, Ingo Molnar <mingo@...e.hu> wrote:
> > >  so it's probably the first few page allocations (setup_cpu_cache())
> > >  going wrong already - suggesting a some fundamental borkage in SLAB?
> > 
> > I think it's still pointing to the page allocator and/or setting up 
> > the zonelists...
> 
> i did a .config bisection and it pinpointed CONFIG_SPARSEMEM=y as the 
> culprit. Changing it to FLATMEM gives a correctly booting system.
> 
..
> why are there no good debug logs possible in this area? To debug such 
> bugs we'd need an early dump of the precise layout of all memory maps, 
> what points where, how large it is, where it is allocated - and then 
> compare it with how the rest of the system is layed out - looking at 
> possible overlaps or other bugs. This 8-way box is a pain to debug on, 
> it takes a long time to boot it up, etc. etc.

so same config 64 bit with SLUB works and only 32bit is broken? or it 2.6.24 with 32bit + sparse + slub is broken already?

YH

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