linux-kernel - Re: crash in kmem_cache

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Message-ID: <20080117181222.GA24411@aepfle.de>
Date:	Thu, 17 Jan 2008 19:12:22 +0100
From:	Olaf Hering <olaf@...fle.de>
To:	Christoph Lameter <clameter@....com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Linux MM <linux-mm@...ck.org>
Subject: Re: crash in kmem_cache_init

On Thu, Jan 17, Christoph Lameter wrote:

> On Thu, 17 Jan 2008, Pekka Enberg wrote:
> 
> > Looks similar to the one discussed on linux-mm ("[BUG] at
> > mm/slab.c:3320" thread). Christoph?
> 
> Right. Try the latest version of the patch to fix it:

The patch does not help.
 
> Index: linux-2.6/mm/slab.c
> ===================================================================
> --- linux-2.6.orig/mm/slab.c	2008-01-03 12:26:42.000000000 -0800
> +++ linux-2.6/mm/slab.c	2008-01-09 15:59:49.000000000 -0800
> @@ -2977,7 +2977,10 @@ retry:
>  	}
>  	l3 = cachep->nodelists[node];
>  
> -	BUG_ON(ac->avail > 0 || !l3);
> +	if (!l3)
> +		return NULL;
> +
> +	BUG_ON(ac->avail > 0);
>  	spin_lock(&l3->list_lock);
>  
>  	/* See if we can refill from the shared array */

Is this hunk supposed to go into cache_grow()? There is no NULL check
for l3.

But if I do that, it does not help:

freeing bootmem node 1
Memory: 3496632k/3571712k available (6188k kernel code, 75080k reserved, 1324k data, 1220k bss, 304k init)
cache_grow(2781) swapper(0):c0,j4294937299 cp c0000000006a4fb8 !l3
Kernel panic - not syncing: kmem_cache_create(): failed to create slab `size-32'

Rebooting in 1 seconds..    

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