From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f41.google.com (mail-pa0-f41.google.com [209.85.220.41]) by kanga.kvack.org (Postfix) with ESMTP id 2B37D6B0032 for ; Wed, 11 Feb 2015 03:16:38 -0500 (EST) Received: by mail-pa0-f41.google.com with SMTP id kx10so2550896pab.0 for ; Wed, 11 Feb 2015 00:16:37 -0800 (PST) Received: from mx2.parallels.com (mx2.parallels.com. [199.115.105.18]) by mx.google.com with ESMTPS id qn11si989223pdb.229.2015.02.11.00.16.36 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 11 Feb 2015 00:16:37 -0800 (PST) From: Vladimir Davydov Subject: [PATCH -mm] slub: kmem_cache_shrink: init discard list after freeing slabs Date: Wed, 11 Feb 2015 11:16:22 +0300 Message-ID: <1423642582-23553-1-git-send-email-vdavydov@parallels.com> In-Reply-To: <1423627463.5968.99.camel@intel.com> References: <1423627463.5968.99.camel@intel.com> MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Huang Ying , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim Otherwise, if there are > 1 nodes, we can get use-after-free while processing the second or higher node: WARNING: CPU: 60 PID: 1 at lib/list_debug.c:29 __list_add+0x3c/0xa9() list_add corruption. next->prev should be prev (ffff881ff0a6bb98), but was ffffea007ff57020. (next=ffffea007fbf7320). Modules linked in: CPU: 60 PID: 1 Comm: swapper/0 Not tainted 3.19.0-rc7-next-20150203-gb50cadf #2178 Hardware name: Intel Corporation BRICKLAND/BRICKLAND, BIOS BIVTSDP1.86B.0038.R02.1307231126 07/23/2013 0000000000000009 ffff881ff0a6ba88 ffffffff81c2e096 ffffffff810e2d03 ffff881ff0a6bad8 ffff881ff0a6bac8 ffffffff8108b320 ffff881ff0a6bb18 ffffffff8154bbc7 ffff881ff0a6bb98 ffffea007fbf7320 ffffea00ffc3c220 Call Trace: [] dump_stack+0x4c/0x65 [] ? console_unlock+0x398/0x3c7 [] warn_slowpath_common+0xa1/0xbb [] ? __list_add+0x3c/0xa9 [] warn_slowpath_fmt+0x46/0x48 [] __list_add+0x3c/0xa9 [] __kmem_cache_shrink+0x12b/0x24c [] kmem_cache_shrink+0x26/0x38 [] acpi_os_purge_cache+0xe/0x12 [] acpi_purge_cached_objects+0x32/0x7a [] acpi_initialize_objects+0x17e/0x1ae [] ? acpi_sleep_proc_init+0x2a/0x2a [] acpi_init+0x92/0x25e [] ? do_one_initcall+0x90/0x17f [] ? kfree+0x1fc/0x2d5 [] ? acpi_sleep_proc_init+0x2a/0x2a [] do_one_initcall+0xed/0x17f [] kernel_init_freeable+0x1f0/0x278 [] ? rest_init+0x13e/0x13e [] kernel_init+0xe/0xda [] ret_from_fork+0x7c/0xb0 [] ? rest_init+0x13e/0x13e fixes: slub-never-fail-to-shrink-cache Signed-off-by: Vladimir Davydov Reported-by: Huang Ying Cc: Christoph Lameter Cc: Pekka Enberg Cc: David Rientjes Cc: Joonsoo Kim --- mm/slub.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/slub.c b/mm/slub.c index 0909e13cf708..59dde3f3efed 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -3499,6 +3499,8 @@ int __kmem_cache_shrink(struct kmem_cache *s, bool deactivate) list_for_each_entry_safe(page, t, &discard, lru) discard_slab(s, page); + INIT_LIST_HEAD(&discard); + if (slabs_node(s, node)) ret = 1; } -- 1.7.10.4 -- 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