linux-kernel - Re: kernel BUG in __cache_alloc_node at linux-2.6.git/mm/slab.c:3177!

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 20 Oct 2006 10:46:13 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andrew Morton <akpm@...l.org>
cc:	Andy Whitcroft <apw@...dowen.org>,
	Paul Mackerras <paulus@...ba.org>,
	Anton Blanchard <anton@...ba.org>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, Mel Gorman <mel@....ul.ie>,
	Mike Kravetz <kravetz@...ibm.com>, will_schmidt@...t.ibm.com,
	Jeff Garzik <jeff@...zik.org>
Subject: Re: kernel BUG in __cache_alloc_node at linux-2.6.git/mm/slab.c:3177!

Here is the patch:

Slab: Do not fallback to nodes that have not been bootstrapped yet

The zonelist may contain zones of nodes that have not been bootstrapped 
and we will oops if we try to allocate from those zones. So check if the 
node information for the slab and the node have been setup before 
attempting an allocation. If it has not been setup then skip that zone.

Usually we will not encounter this situation since the slab bootstrap
code avoids falling back before we have setup the respective nodes but we 
seem to have a special needs for pppc.

Signed-off-by: Christoph Lameter <clameter@....com>

Index: linux-2.6.19-rc2-mm1/mm/slab.c
===================================================================
--- linux-2.6.19-rc2-mm1.orig/mm/slab.c	2006-10-20 12:39:02.000000000 -0500
+++ linux-2.6.19-rc2-mm1/mm/slab.c	2006-10-20 12:41:04.137684581 -0500
@@ -3160,12 +3160,15 @@ void *fallback_alloc(struct kmem_cache *
 	struct zone **z;
 	void *obj = NULL;
 
-	for (z = zonelist->zones; *z && !obj; z++)
+	for (z = zonelist->zones; *z && !obj; z++) {
+		int nid = zone_to_nid(*z);
+
 		if (zone_idx(*z) <= ZONE_NORMAL &&
-				cpuset_zone_allowed(*z, flags))
+				cpuset_zone_allowed(*z, flags) &&
+				cache->nodelists[nid])
 			obj = __cache_alloc_node(cache,
-					flags | __GFP_THISNODE,
-					zone_to_nid(*z));
+					flags | __GFP_THISNODE, nid);
+	}
 	return obj;
 }
 

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/