linux-kernel - Re: [bug] mm/slab.c boot crash in -git, "kernel BUG at mm/slab.c:2103!"

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Message-ID: <20080411085411.GA10181@elte.hu>
Date:	Fri, 11 Apr 2008 10:54:11 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	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] mm/slab.c boot crash in -git, "kernel BUG at
	mm/slab.c:2103!"


* Pekka Enberg <penberg@...helsinki.fi> wrote:

> >  >  it to build on .25) but that didnt solve the problem either.
> 
> On Fri, Apr 11, 2008 at 11:21 AM, Pekka Enberg <penberg@...helsinki.fi> wrote:
> >  As mentioned privately, I suspect it's the page allocator changes that
> >  went into 2.6.24. Mel, Christoph, any ideas?
> 
> So I'm thinking it's probably related to this patch:
> 
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=523b945855a1427000ffc707c610abe5947ae607
> 
> As kmalloc_node() in setup_cpu_cache() returns NULL, it seems likely 
> to be due to the use of GFP_THISNODE in cache_alloc_refill() when 
> calling cache_grow() and that the semantics changed. No idea why page 
> allocator would think your UMA "local node" has no memory though.

but ... as i said it in my report, this is a regression since v2.6.24 - 
v2.6.24 (and a whole bunch of commits since then, i listed the IDs) 
booted up fine. The commit ID you mention is: v2.6.23-4345-g523b945, way 
earlier than the good commit IDs.

so this is a recent regression.

	Ingo
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