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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 469A8C433ED for ; Wed, 7 Apr 2021 19:23:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1B34E61055 for ; Wed, 7 Apr 2021 19:23:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1355617AbhDGTXL (ORCPT ); Wed, 7 Apr 2021 15:23:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56392 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229512AbhDGTXK (ORCPT ); Wed, 7 Apr 2021 15:23:10 -0400 Received: from mail-lj1-x232.google.com (mail-lj1-x232.google.com [IPv6:2a00:1450:4864:20::232]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 95E25C06175F for ; Wed, 7 Apr 2021 12:23:00 -0700 (PDT) Received: by mail-lj1-x232.google.com with SMTP id a1so22079318ljp.2 for ; Wed, 07 Apr 2021 12:23:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=hq3OhgeTuQUA0PjJz23JVz00wO7dXBNObsytreflNCg=; b=eCs1MmuZhzl6TlzwYJCrgdonogfEDf++9zDPp5n3yN7O6rr/XUokUy1nBpm2iClbZ+ PLgL+MdamCMbDAvFj1z1GiONnaysf9/lwlgcTxtWwHPs3i4zNzTzb5LZqTrt4IxO4MUd jfIJ/FVa6bfd8eLTSkso09lvbZXO2sZM/MBKc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=hq3OhgeTuQUA0PjJz23JVz00wO7dXBNObsytreflNCg=; b=piK7pAlfX2ARs37UoF3Y3sc/F+NN0OLLfllKWiEVQyo8FArzf7GMFqNX4d9PxPZkcs /MQxTj0iNpqTXRK/zP8zzAEt+awGio3SqQoqRrYYyfILAmWX8WQE9AEeWSIL4YBZ7IK3 qU86o1htFFNm7f+paj5h0oaklmJZy+GCaN/7HSTlf00gh7nIMzQ5sMGl+/m/WOKxMgy9 hJ+hfKdPEvJbO6vHpltQ+XbOGK1st4dKBhuEs5isocEoL+KEl7N5zJ6sJkw3E/RazILC AzBCyPvnI20ozbH6/BqIuiMi6X5+6hc+AkKrM0aQeYdPhzehkbL0DWDNAQ9iQg9JaZKZ QBfQ== X-Gm-Message-State: AOAM532RsBkJwQ7fm/j76x9vWFXfTGIuPZEY6Ch3k2uRay0L2Lm37SUf 0AsNbB+ugYAD8nglsRnxhDWoxLDJDTZFzHcK X-Google-Smtp-Source: ABdhPJx8Vu/8aoiJpGLvOZJGuIr8/pXd6rLhz5RNwwZOGiX570TJh0eyNqBpLjVQMvrQqZFXdYYbxA== X-Received: by 2002:a2e:b053:: with SMTP id d19mr3125329ljl.82.1617823378875; Wed, 07 Apr 2021 12:22:58 -0700 (PDT) Received: from mail-lj1-f175.google.com (mail-lj1-f175.google.com. [209.85.208.175]) by smtp.gmail.com with ESMTPSA id p26sm664433lfo.127.2021.04.07.12.22.58 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 07 Apr 2021 12:22:58 -0700 (PDT) Received: by mail-lj1-f175.google.com with SMTP id z8so22017148ljm.12 for ; Wed, 07 Apr 2021 12:22:58 -0700 (PDT) X-Received: by 2002:a2e:b6c6:: with SMTP id m6mr2990148ljo.411.1617823377841; Wed, 07 Apr 2021 12:22:57 -0700 (PDT) MIME-Version: 1.0 References: <20210401181741.168763-1-surenb@google.com> In-Reply-To: From: Linus Torvalds Date: Wed, 7 Apr 2021 12:22:41 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 0/5] 4.14 backports of fixes for "CoW after fork() issue" To: Mikulas Patocka Cc: Suren Baghdasaryan , Vlastimil Babka , Peter Xu , stable , Greg Kroah-Hartman , Jann Horn , Kirill Tkhai , Shaohua Li , Nadav Amit , Linux-MM , Linux Kernel Mailing List , Android Kernel Team , Andrea Arcangeli , David Hildenbrand , Jason Gunthorpe Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Apr 7, 2021 at 11:47 AM Mikulas Patocka wrote: > > So, we fixed it, but we don't know why. > > Peter Xu's patchset that fixed it is here: > https://lore.kernel.org/lkml/20200821234958.7896-1-peterx@redhat.com/ Yeah, that's the part that ends up being really painful to backport (with all the subsequent fixes too), so the 4.14 people would prefer to avoid it. But I think that if it's a "requires dax pmem and ptrace on top", it may simply be a non-issue for those users. Although who knows - maybe that ends up being a real issue on Android.. Linus