From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx129.postini.com [74.125.245.129]) by kanga.kvack.org (Postfix) with SMTP id 7A1F16B0062 for ; Wed, 8 Aug 2012 17:03:23 -0400 (EDT) Message-Id: <20120808210209.241924686@linux.com> Date: Wed, 08 Aug 2012 16:01:30 -0500 From: Christoph Lameter Subject: Common11 [01/20] slub: Add debugging to verify correct cache use on kmem_cache_free() References: <20120808210129.987345284@linux.com> Content-Disposition: inline; filename=slub_new_debug Sender: owner-linux-mm@kvack.org List-ID: To: Joonsoo Kim Cc: Glauber Costa , Pekka Enberg , linux-mm@kvack.org, David Rientjes Add additional debugging to check that the objects is actually from the cache the caller claims. Doing so currently trips up some other debugging code. It takes a lot to infer from that what was happening. V2: Only warn once. Signed-off-by: Christoph Lameter Index: linux-2.6/mm/slub.c =================================================================== --- linux-2.6.orig/mm/slub.c 2012-08-03 14:16:27.396663869 -0500 +++ linux-2.6/mm/slub.c 2012-08-03 14:16:38.664866880 -0500 @@ -2607,6 +2607,13 @@ void kmem_cache_free(struct kmem_cache * page = virt_to_head_page(x); + if (kmem_cache_debug(s) && page->slab != s) { + printk("kmem_cache_free: Wrong slab cache. %s but object" + " is from %s\n", page->slab->name, s->name); + WARN_ON_ONCE(1); + return; + } + slab_free(s, page, x, _RET_IP_); trace_kmem_cache_free(_RET_IP_, x); -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org