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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5B65EC4332F for ; Thu, 10 Nov 2022 22:10:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231681AbiKJWKa (ORCPT ); Thu, 10 Nov 2022 17:10:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34170 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231266AbiKJWKZ (ORCPT ); Thu, 10 Nov 2022 17:10:25 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BC2562F01A for ; Thu, 10 Nov 2022 14:09:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1668118166; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=h38wWhVkSIZtB2RyPJKkf5rNtE65Gqs4wgaNeAIALcc=; b=iXWbs2f6EkBl/zy/ngnkuvQFZdKeqJkiSJLig1Zl6mxsOYuEW5zkgnQsWpvLe1r1qZIDsY SkRY/cSw1gZ6qK5+R8jjQ3tPuak9clhepX9d05IFz1rZDpqaKD+lcybX5RjWkhIOI25tL1 q5WZd0EFob4F+PdNNdl6Ubqp6fiH4yQ= Received: from mail-qv1-f71.google.com (mail-qv1-f71.google.com [209.85.219.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_128_GCM_SHA256) id us-mta-481-ct7P0MBVP7Kmf5zuRt6WhQ-1; Thu, 10 Nov 2022 17:09:25 -0500 X-MC-Unique: ct7P0MBVP7Kmf5zuRt6WhQ-1 Received: by mail-qv1-f71.google.com with SMTP id q17-20020a056214019100b004b1d3c9f3acso2537322qvr.0 for ; Thu, 10 Nov 2022 14:09:25 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=h38wWhVkSIZtB2RyPJKkf5rNtE65Gqs4wgaNeAIALcc=; b=rfdhHTcCzc4yWG69kH8nMX2qcWOnAex4GCOZeJGAhjuPa1yUtXgElN48mvDEyLk5V+ xAMUflN5vhliatFRamJK18/nyx60l85wlQJTstS51Ja/xN0yJq8MR7wJnh4nIpjS7nSd FK6Txfq1ZBGYWskXLtK6wHDMkEV7hMJtvhSDwDgM92DDuyl+qatrN7f8KfSHa7+BtUE3 nJuM78TNwi1LfjCpUptFR4TUbl6c3rf+f5fdlcG9REKjAJmBIj/eOJQokXFKya+a1Tqk Fg2G3OEmFmBf/NgfcdkvkFiWkH+S3W4VXPNjW9pKTAtwje6R/NEV6/ASzCOctc//yUyS CBqw== X-Gm-Message-State: ACrzQf3U2ULJWLngpzPNMj0LfldUDJJRNGqMqvhjM8Jh3QYbbwJzIui9 SJt7k9Pgu9BJNb1WA7iqgVV2u1Svy2UsNWkECI0utF8NTxdER6GAq7iKIHxLaJKcK8tQkie1/OG Xfbm5US2cACX0CQJ8 X-Received: by 2002:a05:6214:418c:b0:4b1:8788:21ff with SMTP id ld12-20020a056214418c00b004b1878821ffmr2170365qvb.16.1668118165057; Thu, 10 Nov 2022 14:09:25 -0800 (PST) X-Google-Smtp-Source: AMsMyM4zT6Kz79MRmDBsfpoBn32M93cP30ai8uShqGW0DU7ZFM+GRq+eHe4ng1aNLorRKZp5T5POkg== X-Received: by 2002:a05:6214:418c:b0:4b1:8788:21ff with SMTP id ld12-20020a056214418c00b004b1878821ffmr2170352qvb.16.1668118164890; Thu, 10 Nov 2022 14:09:24 -0800 (PST) Received: from x1n (bras-base-aurron9127w-grc-46-70-31-27-79.dsl.bell.ca. [70.31.27.79]) by smtp.gmail.com with ESMTPSA id q45-20020a05620a2a6d00b006ee7923c187sm346175qkp.42.2022.11.10.14.09.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Nov 2022 14:09:24 -0800 (PST) Date: Thu, 10 Nov 2022 17:09:23 -0500 From: Peter Xu To: Nadav Amit Cc: kernel list , Linux-MM , Andrea Arcangeli , Axel Rasmussen , Ives van Hoorne , Andrew Morton , Mike Rapoport , stable@vger.kernel.org Subject: Re: [PATCH v2 1/2] mm/migrate: Fix read-only page got writable when recover pte Message-ID: References: <20221110203132.1498183-1-peterx@redhat.com> <20221110203132.1498183-2-peterx@redhat.com> <65FA2E7E-1F12-4919-BD79-11159934CF2C@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <65FA2E7E-1F12-4919-BD79-11159934CF2C@gmail.com> Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Thu, Nov 10, 2022 at 01:28:31PM -0800, Nadav Amit wrote: > On Nov 10, 2022, at 12:31 PM, Peter Xu wrote: > > > Ives van Hoorne from codesandbox.io reported an issue regarding possible > > data loss of uffd-wp when applied to memfds on heavily loaded systems. The > > sympton is some read page got data mismatch from the snapshot child VMs. > > symptom (if you care) Yes, but, > > Other than that LGTM this definitely matters more. :) Thanks for taking a look, Nadav. -- Peter Xu