linux-kernel - Re: crash in kmem_cache

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Date:	Tue, 22 Jan 2008 15:12:20 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Pekka Enberg <penberg@...helsinki.fi>
cc:	Mel Gorman <mel@....ul.ie>, Olaf Hering <olaf@...fle.de>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	hanth Aravamudan <nacc@...ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	lee.schermerhorn@...com, Linux MM <linux-mm@...ck.org>,
	akpm@...ux-foundation.org
Subject: Re: crash in kmem_cache_init

On Wed, 23 Jan 2008, Pekka Enberg wrote:

> When we call fallback_alloc() because the current node has ->nodelists set to
> NULL, we end up calling kmem_getpages() with -1 as the node id which is then
> translated to numa_node_id() by alloc_pages_node. But the reason we called
> fallback_alloc() in the first place is because numa_node_id() doesn't have a
> ->nodelist which makes cache_grow() oops.

Right, if nodeid == -1 then we need to call alloc_pages... 
Essentiall a revert of 50c85a19e7b3928b5b5188524c44ffcbacdd4e35 from 2005.

But I doubt that this is it. The fallback logic was added later and it 
worked fine.


---
 mm/slab.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Index: linux-2.6/mm/slab.c
===================================================================
--- linux-2.6.orig/mm/slab.c	2008-01-22 15:05:26.185452369 -0800
+++ linux-2.6/mm/slab.c	2008-01-22 15:05:59.301637009 -0800
@@ -1668,7 +1668,11 @@ static void *kmem_getpages(struct kmem_c
 	if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
 		flags |= __GFP_RECLAIMABLE;
 
-	page = alloc_pages_node(nodeid, flags, cachep->gfporder);
+	if (nodeid == -1)
+		page = alloc_pages(flags, cachep->gfporder);
+	else
+		page = alloc_pages_node(nodeid, flags, cachep->gfporder);
+
 	if (!page)
 		return NULL;
 
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