From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EA048C43441 for ; Mon, 26 Nov 2018 17:10:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B8CEF20663 for ; Mon, 26 Nov 2018 17:10:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B8CEF20663 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727132AbeK0EE7 (ORCPT ); Mon, 26 Nov 2018 23:04:59 -0500 Received: from mx1.redhat.com ([209.132.183.28]:60070 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726224AbeK0EE7 (ORCPT ); Mon, 26 Nov 2018 23:04:59 -0500 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id C68F7307DAA3; Mon, 26 Nov 2018 17:10:15 +0000 (UTC) Received: from llong.remote.csb (dhcp-17-55.bos.redhat.com [10.18.17.55]) by smtp.corp.redhat.com (Postfix) with ESMTP id D6DED105706A; Mon, 26 Nov 2018 17:10:14 +0000 (UTC) Subject: Re: [PATCH] debugobjects: avoid recursive calls with kmemleak To: Qian Cai , akpm@linux-foundation.org Cc: tglx@linutronix.de, yang.shi@linux.alibaba.com, arnd@arndb.de, catalin.marinas@arm.com, linux-kernel@vger.kernel.org References: <20181126165343.2339-1-cai@gmx.us> From: Waiman Long Openpgp: preference=signencrypt Autocrypt: addr=longman@redhat.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20181126165343.2339-1-cai@gmx.us> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.42]); Mon, 26 Nov 2018 17:10:16 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/26/2018 11:53 AM, Qian Cai wrote: > CONFIG_DEBUG_OBJECTS_RCU_HEAD does not play well with kmemleak due to > recursive calls. > > fill_pool > kmemleak_ignore > make_black_object > put_object > __call_rcu (kernel/rcu/tree.c) > debug_rcu_head_queue > debug_object_activate > debug_object_init > fill_pool > kmemleak_ignore > make_black_object > ... > > Hence, adding SLAB_NOLEAKTRACE to kmem_cache_create() to not register a > newly allocated debug objects at all. > > Suggested-by: Catalin Marinas > Signed-off-by: Qian Cai > --- > lib/debugobjects.c | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) > > diff --git a/lib/debugobjects.c b/lib/debugobjects.c > index eab7727b46ed..55437fd5128b 100644 > --- a/lib/debugobjects.c > +++ b/lib/debugobjects.c > @@ -135,7 +135,6 @@ static void fill_pool(void) > if (!new) > return; > > - kmemleak_ignore(new); > raw_spin_lock_irqsave(&pool_lock, flags); > hlist_add_head(&new->node, &obj_pool); > debug_objects_allocated++; > @@ -1128,7 +1127,6 @@ static int __init debug_objects_replace_static_objects(void) > obj = kmem_cache_zalloc(obj_cache, GFP_KERNEL); > if (!obj) > goto free; > - kmemleak_ignore(obj); > hlist_add_head(&obj->node, &objects); > } > > @@ -1182,7 +1180,8 @@ void __init debug_objects_mem_init(void) > > obj_cache = kmem_cache_create("debug_objects_cache", > sizeof (struct debug_obj), 0, > - SLAB_DEBUG_OBJECTS, NULL); > + SLAB_DEBUG_OBJECTS | SLAB_NOLEAKTRACE, > + NULL); > > if (!obj_cache || debug_objects_replace_static_objects()) { > debug_objects_enabled = 0; Acked-by: Waiman Long