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Date: Sat, 26 May 2007 12:49:30 +1000 (EST)
From: Srihari Vijayaraghavan <sriharivijayaraghavan@yahoo.com.au>
Subject: Re: [PROBLEM] 2.6.22-rc2 panics on x86-64 with slub
To: Christoph Lameter <clameter@sgi.com>,
       Andrew Morton <akpm@linux-foundation.org>
Cc: Hugh Dickins <hugh@veritas.com>, Ingo Molnar <mingo@elte.hu>,
       Oliver Xymoron <oxymoron@waste.org>, Jens Axboe <jens.axboe@oracle.com>,
       linux-kernel@vger.kernel.org
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--- Christoph Lameter <clameter@sgi.com> wrote:
> I finally figured out the second issue. Took some time to get that figure 
> out. Sorry. But now all the bug reports make sense.

[...]

Impressive Christoph. Indeed, this fixes my problem on latest -git (its hg
equivalent :-)). Well done.

(Tested with CONFIG_SLAB_DEBUG without slub_debug; all was well. Then with
slub_debug & slabinfo -v also; again all was well. I had many LOCKDEP and its
relatives also compiled in.)

Now hoping it'll be in 2.6.22-rc3 :-)).

> Signed-off-by: Christoph Lameter <clameter@sgi.com>
> 
> ---
>  mm/slub.c |    7 +++++++
>  1 file changed, 7 insertions(+)
> 
> Index: slub/mm/slub.c
> ===================================================================
> --- slub.orig/mm/slub.c	2007-05-25 18:28:42.000000000 -0700
> +++ slub/mm/slub.c	2007-05-25 18:29:46.000000000 -0700
> @@ -2473,6 +2473,7 @@ void __init kmem_cache_init(void)
>  	 */
>  	create_kmalloc_cache(&kmalloc_caches[0], "kmem_cache_node",
>  		sizeof(struct kmem_cache_node), GFP_KERNEL);
> +	kmalloc_caches[0].refcount = -1;
>  #endif
>  
>  	/* Able to allocate the per node structures */
> @@ -2520,6 +2521,12 @@ static int slab_unmergeable(struct kmem_
>  	if (s->ctor)
>  		return 1;
>  
> +	/*
> +	 * We may have set a slab to be unmergeable during bootstrap.
> +	 */
> +	if (s->refcount < 0)
> +		return 1;
> +
>  	return 0;
>  }


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