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Reply-To: yhlu.kernel@gmail.com
To: Ingo Molnar <mingo@elte.hu>
Subject: Re: [bug] SLUB + mm/slab.c boot crash in -rc9
Date: Tue, 15 Apr 2008 01:31:18 -0700
User-Agent: KMail/1.9.6 (enterprise 20070904.708012)
Cc: Pekka Enberg <penberg@cs.helsinki.fi>, linux-kernel@vger.kernel.org,
       Christoph Lameter <clameter@sgi.com>, Mel Gorman <mel@csn.ul.ie>,
       Nick Piggin <npiggin@suse.de>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       "Rafael J. Wysocki" <rjw@sisk.pl>
References: <20080411074145.GA4944@elte.hu> <84144f020804142341ic4621c9o6de06d68eee74871@mail.gmail.com> <20080415070811.GA15499@elte.hu>
In-Reply-To: <20080415070811.GA15499@elte.hu>
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Message-Id: <200804150131.18469.yhlu.kernel@gmail.com>
From: Yinghai Lu <yhlu.kernel.send@gmail.com>
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On Tuesday 15 April 2008 12:08:11 am Ingo Molnar wrote:
> 
> * Pekka Enberg <penberg@cs.helsinki.fi> wrote:
> 
> > On Tue, Apr 15, 2008 at 9:25 AM, Ingo Molnar <mingo@elte.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