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=-2.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 70A70C433E0 for ; Tue, 5 Jan 2021 08:53:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 25FBA2255F for ; Tue, 5 Jan 2021 08:53:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727690AbhAEIxc (ORCPT ); Tue, 5 Jan 2021 03:53:32 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60990 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725948AbhAEIxb (ORCPT ); Tue, 5 Jan 2021 03:53:31 -0500 Received: from mail-pf1-x435.google.com (mail-pf1-x435.google.com [IPv6:2607:f8b0:4864:20::435]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 908A0C061793 for ; Tue, 5 Jan 2021 00:52:51 -0800 (PST) Received: by mail-pf1-x435.google.com with SMTP id h186so18006775pfe.0 for ; Tue, 05 Jan 2021 00:52:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=EbrvcIwMoq++jgGTTRvYm5QFBxlGfKoxxIGECgFMJYs=; b=iGmg5LmhKiGSj2U64qF0fgcCB8bubcJN299bsUyCR6SQmZAkwMTvKYpHDzwZ6pE/GP 2OvopbsxX9hahbZzHItuq8wMbo+SGz+fJP6Xkc5+FznmqPC292KTkUStSsIpVtbX117F 4wBUmFVPebUPiaHHpYHUZK9APj2CcpiYdsKVHP2cQmKPz1vx7H8p86ViP1X5eiacEoc8 ps0/OXGCJV4MCep03X9ZiCsVVYtLHer+51pVb7euxMoinLNClk1HbT0I4+ppvMwHAC3R uWQZOEq6Kq+4f2chP1fYjTFzKr4jpI/dZ3KFuKO4ZOHbLPULraJ9HIFeXfyr8UE49wNg kbsQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=EbrvcIwMoq++jgGTTRvYm5QFBxlGfKoxxIGECgFMJYs=; b=lFFLcwHjAcAhi9E4u1pBcB8hiO8TFrN37dH1ICDMaAkVHM2Xs/THB9njQXJtz0B21s rGZLzogmBZLSn66W8/57KMQoMNQPFobxKzL820uFXQ2mmRJ7fXZarCIambSiFXQcZ2hM Gf8GaecuZWQXn/jELGLGDAAaVTqQJN/DN4rwSp4CKYmrHVqAep3/r/owZpMvfjhndXAy xRUtMBBpuc4pZeJrDBy1Ia9R447hM3WpWmyc6fYozPjCHU4zJxhC52uHwpzcx1Gb75hQ p6mX9klQUD2SF0V8j7NQrMTvz33KEWwqtIFnW2pPdfQFHF0QTocEAv9Vp9ws7puwlZsy d6hg== X-Gm-Message-State: AOAM533Z44HHkpIAUylyZgRr0Y0lGBznIyWPEqlNYFzMSyO3LAYF8NWd P062dCkBlTTs0OrAc4g0uKmRnOjWioe0NA== X-Google-Smtp-Source: ABdhPJxoQkfzGtKhM86tK/6Z4qK1vxD+A+V0mLOdiD4QgZVp1moAwHuhNpb/an9EgXzjaatpo4dlKA== X-Received: by 2002:a63:5701:: with SMTP id l1mr40644023pgb.381.1609836770995; Tue, 05 Jan 2021 00:52:50 -0800 (PST) Received: from [192.168.88.245] (c-24-6-216-183.hsd1.ca.comcast.net. [24.6.216.183]) by smtp.gmail.com with ESMTPSA id 197sm63832387pgg.43.2021.01.05.00.52.49 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 05 Jan 2021 00:52:50 -0800 (PST) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.4\)) Subject: Re: [RFC PATCH v2 1/2] mm/userfaultfd: fix memory corruption due to writeprotect From: Nadav Amit In-Reply-To: <20210105081325.GD3040@hirez.programming.kicks-ass.net> Date: Tue, 5 Jan 2021 00:52:48 -0800 Cc: Andrea Arcangeli , linux-mm , lkml , Yu Zhao , Andy Lutomirski , Peter Xu , Pavel Emelyanov , Mike Kravetz , Mike Rapoport , Minchan Kim , Will Deacon , Mel Gorman Content-Transfer-Encoding: 7bit Message-Id: References: <20201225092529.3228466-1-namit@vmware.com> <20201225092529.3228466-2-namit@vmware.com> <20210104122227.GL3021@hirez.programming.kicks-ass.net> <20210105081325.GD3040@hirez.programming.kicks-ass.net> To: Peter Zijlstra X-Mailer: Apple Mail (2.3608.120.23.2.4) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On Jan 5, 2021, at 12:13 AM, Peter Zijlstra wrote: > > On Mon, Jan 04, 2021 at 02:24:38PM -0500, Andrea Arcangeli wrote: >> The problematic one not pictured is the one of the wrprotect that has >> to be running in another CPU which is also isn't picture above. More >> accurate traces are posted later in the thread. > > What thread? I don't seem to have discovered it yet, and the cover > letter from Nadav doesn't seem to have a msgid linking it either. Sorry for that: https://lore.kernel.org/lkml/X+K7JMrTEC9SpVIB@google.com/T/