linux-kernel - Re: [PATCH] list_add corruption in slab.c

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Date:	Tue, 25 Mar 2008 20:45:33 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Daniel Yeisley" <dan.yeisley@...sys.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org,
	"Christoph Lameter" <clameter@....com>
Subject: Re: [PATCH] list_add corruption in slab.c

Hi Daniel,

On Tue, Mar 25, 2008 at 6:57 PM, Daniel Yeisley <dan.yeisley@...sys.com> wrote:
> I've been seeing list_add corruption in slab.c on the ES7000 since the
>  2.6.24.1 kernel.  There are several places where the initkmem_list3
>  array is access by [somevalue + node].  This also needs to be done in
>  kmem_cache_init().
>
>  Signed-off-by: Dan Yeisley <dan.yeisley@...sys.com>
>
>  ---
>  diff -Naur linux-2.6.25-rc5/mm/slab.c linux-2.6.25-rc5-new/mm/slab.c
>  --- linux-2.6.25-rc5/mm/slab.c  2008-03-10 01:22:27.000000000 -0400
>  +++ linux-2.6.25-rc5-new/mm/slab.c      2008-03-20 13:59:24.000000000 -0400
>  @@ -1481,7 +1481,7 @@
>         list_add(&cache_cache.next, &cache_chain);
>         cache_cache.colour_off = cache_line_size();
>         cache_cache.array[smp_processor_id()] = &initarray_cache.cache;
>  -       cache_cache.nodelists[node] = &initkmem_list3[CACHE_CACHE];
>  +       cache_cache.nodelists[node] = &initkmem_list3[CACHE_CACHE + node];

Good catch! You'd need to fix up the use of initkmem_list3 farther
down in kmem_init_cache():

>        /* 5) Replace the bootstrap kmem_list3's */
>        {
>                int nid;
>
>                for_each_online_node(nid) {
>                        init_list(&cache_cache, &initkmem_list3[CACHE_CACHE], nid);

Care to send a tested patch that fixes that as well?

                          Pekka
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