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

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Message-ID: <84144f020804110150q367260f6k473380a1309db878@mail.gmail.com>
Date:	Fri, 11 Apr 2008 11:50:33 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Ingo Molnar" <mingo@...e.hu>
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>
Subject: Re: [bug] mm/slab.c boot crash in -git, "kernel BUG at mm/slab.c:2103!"

Hi Ingo,
>  On Fri, Apr 11, 2008 at 10:41 AM, Ingo Molnar <mingo@...e.hu> wrote:
>  >  our x86.git randconfig auto-qa found a mm/slab.c early-bootup crash in
>  >  mainline that got introduced since v2.6.24.
>  >
>  >   http://redhat.com/~mingo/misc/log-Thu_Apr_10_10_41_16_CEST_2008.bad
>  >   http://redhat.com/~mingo/misc/config-Thu_Apr_10_10_41_16_CEST_2008.bad
>  >
>  >  Note, the very same bzImage does not crash on other testboxes - only on
>  >  this 8-way box with 4GB of RAM.
>  >
>  >  i tried a "use v2.6.24's slab.c" revert (with a few API fixes needed for
>  >  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.

                        Pekka
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