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=-7.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 59462C433E7 for ; Wed, 2 Sep 2020 14:53:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3356A2078E for ; Wed, 2 Sep 2020 14:53:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599058415; bh=fMkJifuCEn8uJKL0YvQ8zIgezv+eq2ISTyQs7pCJMU0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=jjDMpiYCRQTkt2/At36VhmJZb2JHDxTfIT/tLu2usy2k1LmEP1C8EsVYRsAebhnjT ZsKC3mBkgwBCme1zTd0QL9jUXyKZ/TeKHutiZBv45ft2mGTG1ebCJUZ4kD6pNCExpP Sxjb8yLsAFFjkmZExWTNYsA2fj41D0uynsD2jwdU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726800AbgIBOx3 (ORCPT ); Wed, 2 Sep 2020 10:53:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44268 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726678AbgIBOwu (ORCPT ); Wed, 2 Sep 2020 10:52:50 -0400 Received: from mail-qk1-x743.google.com (mail-qk1-x743.google.com [IPv6:2607:f8b0:4864:20::743]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B88B3C061244 for ; Wed, 2 Sep 2020 07:52:50 -0700 (PDT) Received: by mail-qk1-x743.google.com with SMTP id w12so4479461qki.6 for ; Wed, 02 Sep 2020 07:52:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=Umk5Ulvu4oLoYIO+HUXZ2g8XNW9wJ6mMmUfCXe6cwzE=; b=u1QrlX4tBu3SeweQyeFvKcbd9BBbzKPHcAtreRTlE33njRMc4xrp/YRss9Ci+1XqX+ 0xWJ6n7UQr5uBOb+HLR1Gi1qqN/3rG4mHZvtQlPi50OjxzIAQ5GVt57+5LQn4Od+lzjl jYGMV86QT9ZunHZEH/BhYUBDXSQblsoWLudOKuTH8j1YF7k27tHzvRVh8Y4hgcDS/6PC +Zk1u8BeT7PHGtED6kcFwnHyMDUoOv9vK31Qca6YjTjUNyAy3yyeOHMxwL4c1B60duVJ qXoKMXatMGF3ZaXHvIDSU0tDAHb6hDyN9jRZhvc6r0HNEm2oANhB8njQAruZnTk08Egb XX1g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to; bh=Umk5Ulvu4oLoYIO+HUXZ2g8XNW9wJ6mMmUfCXe6cwzE=; b=Rb4Wiq3M7pDsMTO+sw7xzhQe3whAIXaa1REuq7/CzV0CADxhg/JjsOn7RKND6KOOr7 3pNwuE4ZQCSvd1IlFaXoGPixKhYMIeWvDJsea9D/HjKYkQj7YiroEgCMSony+I6Gb4ap oNlkVgiFlC2NEg6cRzP1PigOJ5uM7XRXfpNg+y5glniVrMgZMR8MS86kPYBzG05v/ySk Dbf7xvAJAbLtgPAJi4kmrUKC9uCLRElUQyDGjJ1Lv2zgwqa9NefW6DaWbKvMZ0QxCvYK 7TbJgiizkPpt1q4bpFfrwYFADhfqck6BPiiaeCoBbI70Wso1K0BQ6YJYAd0MCuvG00uE Q98A== X-Gm-Message-State: AOAM531dCHrWQzsdPbR/iilY0Wxov48c4I732kht519CesC8cZswW/p1 eVWzV0ALAW8tLsTWw4BrFf4= X-Google-Smtp-Source: ABdhPJwtF2MnHLtEgYqsM1xBk1VrAbk4U4yp0K+SVFwUEGI/lp1d3JSafaq/2JyqeLrKZqK4fC46LQ== X-Received: by 2002:a37:8b01:: with SMTP id n1mr7286182qkd.62.1599058369875; Wed, 02 Sep 2020 07:52:49 -0700 (PDT) Received: from localhost ([2620:10d:c091:480::1:a198]) by smtp.gmail.com with ESMTPSA id r11sm4772987qtt.2.2020.09.02.07.52.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Sep 2020 07:52:49 -0700 (PDT) Date: Wed, 2 Sep 2020 10:52:41 -0400 From: Tejun Heo To: Walter Wu Cc: Marco Elver , Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Matthias Brugger , Andrew Morton , Lai Jiangshan , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, wsd_upstream , linux-mediatek@lists.infradead.org Subject: Re: [PATCH v3 2/6] workqueue: kasan: record workqueue stack Message-ID: <20200902145241.GG4230@mtj.thefacebook.com> References: <20200825015833.27900-1-walter-zh.wu@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200825015833.27900-1-walter-zh.wu@mediatek.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 25, 2020 at 09:58:33AM +0800, Walter Wu wrote: > Records the last two enqueuing work call stacks in order to print them > in KASAN report. It is useful for programmers to solve use-after-free > or double-free memory workqueue issue. > > For workqueue it has turned out to be useful to record the enqueuing > work call stacks. Because user can see KASAN report to determine > whether it is root cause. They don't need to enable debugobjects, > but they have a chance to find out the root cause. > > Signed-off-by: Walter Wu > Suggested-by: Marco Elver > Cc: Andrey Ryabinin > Cc: Dmitry Vyukov > Cc: Alexander Potapenko > Cc: Tejun Heo > Cc: Lai Jiangshan Acked-by: Tejun Heo Thanks. -- tejun