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 74551C433E0 for ; Tue, 5 Jan 2021 08:14:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2B8E32256F for ; Tue, 5 Jan 2021 08:14:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727388AbhAEIO1 (ORCPT ); Tue, 5 Jan 2021 03:14:27 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54926 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726097AbhAEIO1 (ORCPT ); Tue, 5 Jan 2021 03:14:27 -0500 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B2F2FC061574 for ; Tue, 5 Jan 2021 00:13:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=P9TYkqppwZM/jhjV499wBQy9lm5R97nXtaT3K8wh0k4=; b=cV0wyCH5p+SfmkI3UvRYn5WqG8 41nQmrQkZWPS418IkVIkZAmi1fjqYLhKX1r767cAyN2LAqMeXQKynDTeV4vYUh5q5/1eBwK9AmnM4 Px2oTUTgyXOGgwrgu4gVOGFCLR7SpBBW100T9/Jv1ORQpxkOKzF/Ld3x37YkbQUlNolb40QsTeVyD z3F2H+D5JC+NJDJfMk8RWhY6d8u/vTMFzO6sogjwrEW00kyGgEMEwZWR5dSr2lDNYuTeBWWZtM4za n7hxPa+Fhfmd7aMGpNT3x4SxylDRS+OhGujt1Fp2bS5LBOlY0GAaW1Jyac+EFTL6UazY6sF1CZ4BK xTMew9vw==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kwhT7-00070O-2B; Tue, 05 Jan 2021 08:13:29 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 5980C300446; Tue, 5 Jan 2021 09:13:25 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 3BCBA21213528; Tue, 5 Jan 2021 09:13:25 +0100 (CET) Date: Tue, 5 Jan 2021 09:13:25 +0100 From: Peter Zijlstra To: Andrea Arcangeli Cc: Nadav Amit , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Nadav Amit , Yu Zhao , Andy Lutomirski , Peter Xu , Pavel Emelyanov , Mike Kravetz , Mike Rapoport , Minchan Kim , Will Deacon , Mel Gorman Subject: Re: [RFC PATCH v2 1/2] mm/userfaultfd: fix memory corruption due to writeprotect Message-ID: <20210105081325.GD3040@hirez.programming.kicks-ass.net> References: <20201225092529.3228466-1-namit@vmware.com> <20201225092529.3228466-2-namit@vmware.com> <20210104122227.GL3021@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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.