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=-19.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 B9D27C433E6 for ; Wed, 6 Jan 2021 17:19:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 70C7E23106 for ; Wed, 6 Jan 2021 17:19:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727863AbhAFRSz (ORCPT ); Wed, 6 Jan 2021 12:18:55 -0500 Received: from mail.kernel.org ([198.145.29.99]:60824 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727864AbhAFRSf (ORCPT ); Wed, 6 Jan 2021 12:18:35 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 5F5B823133; Wed, 6 Jan 2021 17:17:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1609953434; bh=lg15qmE9TMvnNiqJ8jpY1kaRpNu5ZZdEeFU6u/ZyAcU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hHBkgxjToXdD/tgIt0kWNEjMW6bsk8qDrJoU2OecGSsX/sTbas3lgFQla2vIrCEzi Qa7TUHS3M6WZ4YlnpTDB/z3IeYn+4uiR3B9fa8rIqvXLMndMOhq+BbmkXyoPIuOUHw 88daOhcPB6kX5UvU6SuyIFvabTmD5I6HUsYoa0CRChmm1WmhJsoONiZRdegc+LlGPh uwsgNEVl1RgGzIn2eB6ZCIs6xkTTibAHZbpqcCHbtP9pFSM7Ligog/N4DDt96/b6E4 Kl6VjRwWnhcAICd6oro1fw670cu7/G1jyR00kKuWTKx5h7MVtKDwuEpcQHrkfuYlbL eoeSJr01Yu8hQ== From: paulmck@kernel.org To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com, mingo@kernel.org, jiangshanlai@gmail.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org, "Paul E. McKenney" Subject: [PATCH tip/core/rcu 13/17] rcutorture: Make object_debug also double call_rcu() heap object Date: Wed, 6 Jan 2021 09:17:06 -0800 Message-Id: <20210106171710.22239-13-paulmck@kernel.org> X-Mailer: git-send-email 2.9.5 In-Reply-To: <20210106171532.GA20769@paulmck-ThinkPad-P72> References: <20210106171532.GA20769@paulmck-ThinkPad-P72> Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org From: "Paul E. McKenney" This commit provides a test for call_rcu() printing the allocation address of a double-freed callback by double-freeing a callback allocated via kmalloc(). However, this commit does not depend on any other commit. Signed-off-by: Paul E. McKenney --- kernel/rcu/rcutorture.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 4a0c6e6..72fd6bb 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -2782,6 +2782,7 @@ static void rcu_test_debug_objects(void) #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD struct rcu_head rh1; struct rcu_head rh2; + struct rcu_head *rhp = kmalloc(sizeof(*rhp), GFP_KERNEL); init_rcu_head_on_stack(&rh1); init_rcu_head_on_stack(&rh2); @@ -2794,6 +2795,10 @@ static void rcu_test_debug_objects(void) local_irq_disable(); /* Make it harder to start a new grace period. */ call_rcu(&rh2, rcu_torture_leak_cb); call_rcu(&rh2, rcu_torture_err_cb); /* Duplicate callback. */ + if (rhp) { + call_rcu(rhp, rcu_torture_leak_cb); + call_rcu(rhp, rcu_torture_err_cb); /* Another duplicate callback. */ + } local_irq_enable(); rcu_read_unlock(); preempt_enable(); -- 2.9.5