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=-2.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 CAA71C54FCF for ; Mon, 23 Mar 2020 01:28:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A1EA920714 for ; Mon, 23 Mar 2020 01:28:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=kernel-dk.20150623.gappssmtp.com header.i=@kernel-dk.20150623.gappssmtp.com header.b="kgtAL3A/" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726979AbgCWB2a (ORCPT ); Sun, 22 Mar 2020 21:28:30 -0400 Received: from mail-pf1-f196.google.com ([209.85.210.196]:37394 "EHLO mail-pf1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726916AbgCWB2a (ORCPT ); Sun, 22 Mar 2020 21:28:30 -0400 Received: by mail-pf1-f196.google.com with SMTP id h72so4474806pfe.4 for ; Sun, 22 Mar 2020 18:28:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-language:content-transfer-encoding; bh=AiAyav6BwFSr29hdXCFnFBhxNCa7Q5OcMKiajqm24bE=; b=kgtAL3A/6q6jkcurZgQ/kVVXu6f85IzCnxR0nwV9strvNuVnOnmy4sxdJ0k0ru7kJc aI4BvhATkLGVtBTW1/B4/RhGO5LO3n1BjpiwKCiTn2PGnbmxFfUtuONEoPBmWdaPvBAo +Oxb3JMtGWXYsuNKG2e4JYF7e+htB9ANmvl1zYsE7Z6L5romyFG/jag1HvVFx6j+hyOo xH3shSVK3thQEQweHvwtBf83/3468I/gEP1ARm9iQv1+Hb9F6s/5K3dSd7raIRur0I7L esl7ic6dt83E9FuT0apPYzZDSViZlff2zT552qXxcSeCESDxns4hTRYwm4+xRJnfhikr 1Biw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=AiAyav6BwFSr29hdXCFnFBhxNCa7Q5OcMKiajqm24bE=; b=bLKnVIuQDJIVpv8VJw6xyEQkxQOsXab1dy9XvTTQBiWbnuwdEIt+JeaCe8MBgtvO6y CVyQkeVSjVw0ngNU/L5ENsOLTpdHARvAJnfQM0jxIhYouzvXW3Px9YNdF/HIAK3uXU3s qArubbEz9Bv5DrYuA/LoHx/PF7BGhB6T5gY36UkFb4UGOZzwwNdOfO+gG5fL4k1PU6Ru zk7qw4ULSpnO0Vg2LsUeZ1RfwECRdfhLwHcNAgu1MG2jikkGfkQgPUoTn9niICbGKE6Y uY6MhfOO4N4IK9wyzhoBQjB7iuqHC1b/ru5lFETqSeo9va4NZwwmvgyPHuErj4i6bLk1 dMfA== X-Gm-Message-State: ANhLgQ0GyDrOOaOV8CfIRxxLOa/E5np3tkkKYCDKcgn5r2ZDXcC92dFe CuSWZwSPEq8QKSj/yvKAH+sLoeP8UyYAKg== X-Google-Smtp-Source: ADFU+vsBiyW0sX3RAY4WyAPXLoLQgRCGZpgI/fXucknlS62yFbmqVtt4Y5o8sFEPdrgT4rTI7yKCew== X-Received: by 2002:a62:2a8c:: with SMTP id q134mr10146989pfq.35.1584926908504; Sun, 22 Mar 2020 18:28:28 -0700 (PDT) Received: from [192.168.1.188] ([66.219.217.145]) by smtp.gmail.com with ESMTPSA id m11sm10334604pjq.13.2020.03.22.18.28.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 22 Mar 2020 18:28:28 -0700 (PDT) Subject: Re: [PATCH 1/1] io_uring: Fix ->data corruption on re-enqueue To: Pavel Begunkov , io-uring@vger.kernel.org, linux-kernel@vger.kernel.org References: From: Jens Axboe Message-ID: Date: Sun, 22 Mar 2020 19:28:26 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/22/20 3:23 PM, Pavel Begunkov wrote: > work->data and work->list are shared in union. io_wq_assign_next() sets > ->data if a req having a linked_timeout, but then io-wq may want to use > work->list, e.g. to do re-enqueue of a request, so corrupting ->data. > > ->data is not necessary, just remove it and extract linked_timeout > through @link_list. You're missing a Fixes line again! -- Jens Axboe