linux-kernel - [PATCH] [4/4] SLAB: Fix node add timer race in cache

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Message-Id: <20100211205404.085FEB1978@basil.firstfloor.org>
Date:	Thu, 11 Feb 2010 21:54:04 +0100 (CET)
From:	Andi Kleen <andi@...stfloor.org>
To:	penberg@...helsinki.fi, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, haicheng.li@...el.com, rientjes@...gle.com
Subject: [PATCH] [4/4] SLAB: Fix node add timer race in cache_reap


cache_reap can run before the node is set up and then reference a NULL 
l3 list. Check for this explicitely and just continue. The node
will be eventually set up.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 mm/slab.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-2.6.32-memhotadd/mm/slab.c
===================================================================
--- linux-2.6.32-memhotadd.orig/mm/slab.c
+++ linux-2.6.32-memhotadd/mm/slab.c
@@ -4093,6 +4093,9 @@ static void cache_reap(struct work_struc
 		 * we can do some work if the lock was obtained.
 		 */
 		l3 = searchp->nodelists[node];
+		/* Note node yet set up */
+		if (!l3)
+			break;
 
 		reap_alien(searchp, l3);
 
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