Received: by 2002:a05:6a10:6d10:0:0:0:0 with SMTP id gq16csp805385pxb; Tue, 12 Apr 2022 13:58:26 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyPo5h6KJFW9nl9fmmJfEK5rzhWLmRgpV04hbNDn6nAfRm8pB3X21pp2GgJwkH04Oq1qMFo X-Received: by 2002:a05:6a00:724:b0:4fa:a35f:8e0f with SMTP id 4-20020a056a00072400b004faa35f8e0fmr6368342pfm.25.1649797106636; Tue, 12 Apr 2022 13:58:26 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1649797106; cv=none; d=google.com; s=arc-20160816; b=N4o+laQ0zW3lyfUoxHmWNz0Artg60EQyYyR437NJrDOsUFD7eJiBVeMWlHPFNq1l9H QdzNJsS2PTJxcR+U3JC0QSwfNzTvQlE1XlWAHvtsuV4Or8cw+nTWbqf7D66xm/MhjnUD hkQpvvA0AvUONmYllPK169at5n4yHaSq1bzpmpMnBd70QWrgI7xIv5oVs/LG6S/xFb7M RR9neo6Ju/wRwlUbqXeDJptGTUHfzomqfFtG+ZtFP3PmgFPGSxp81S5HzVg4DOzxVubx h3O/e5Ty4ppIX4mdXUyGMD9WLhr0lz/kEl4VHcY0124Z4CJZkQLB176xzoFa1R1URMnA rT0A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:in-reply-to:content-disposition:mime-version :references:message-id:subject:cc:to:from:date:dkim-signature; bh=++CuEWmMFr3JtalWqa+Q+0MtLvDBWWOfSiXyxOg+sfQ=; b=vMNLmDz66AbE3AqetxGpuNbLwCW3gUaOLzqkyXdd83nqq5iwBJQNNLCK0yoh9O+DYn TmXeiC/Muvk0QQg5we7jfzs3ybbexPRbYl1aFwI/llB6MPUwbBrorgiG+BWRe7t5Voft QWLEwT42Adb/m2EhdZ5YxDOS1cHyH6ef2+Ruxr3wjCyA3A/C+NmHJCOd4VpItIA89WxX gtwh76tuZi80LBzLVG/9T8KPOOB+YSdjFrNd0iPzcGU81chMf374BTPBBap1hNjrZeNh y4gsXsTE04T+PskRN6/b/r5uZlEWprBfCu7ktnb6AcmFUqxMcx+LAKJae6RYnp7LY06l FjgA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b=TLrlss4I; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net. [2620:137:e000::1:18]) by mx.google.com with ESMTPS id s5-20020a170902988500b001570ab1e071si13441697plp.447.2022.04.12.13.58.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Apr 2022 13:58:26 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) client-ip=2620:137:e000::1:18; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b=TLrlss4I; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (out1.vger.email [IPv6:2620:137:e000::1:20]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id D5860CBE6A; Tue, 12 Apr 2022 13:21:31 -0700 (PDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1354348AbiDLMmy (ORCPT + 99 others); Tue, 12 Apr 2022 08:42:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46480 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1355260AbiDLMjF (ORCPT ); Tue, 12 Apr 2022 08:39:05 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0CDD462A0A for ; Tue, 12 Apr 2022 04:59:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.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=++CuEWmMFr3JtalWqa+Q+0MtLvDBWWOfSiXyxOg+sfQ=; b=TLrlss4IK1zvwsvPnnO4QFfO+b uEx/FCQ6acqIPpWkdk0xR7EyZUBOLJ3NP47L0i+VaJWIcHgu4QC9SS2oo8wd0rFVCnIikMYM942mP w9HBffir9f1dVb6ufswELWsQmQHEyJ/rdZ+iz5N/x96voji6iDhpzPpkPednuilVT/QizIyDC4m3e lmT9B91bQAz0jWYiggebGhgQMl65v2/cq+xJJB4o3T3QGMxYXxOrS0++ZQL4cA/wEbR50aayPSfy9 edJ05lTPPRG02m2Ci99ZUTfshEEFtRbOR9CqGxf396YNnb+r4rtRkFmLD02A1J8IkllcCIR7Fd5ap xf9QLxMA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1neFBP-00DImD-7p; Tue, 12 Apr 2022 11:59:43 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id C82D6300250; Tue, 12 Apr 2022 13:59:42 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id A63C926670FA9; Tue, 12 Apr 2022 13:59:42 +0200 (CEST) Date: Tue, 12 Apr 2022 13:59:42 +0200 From: Peter Zijlstra To: "Eric W. Biederman" Cc: Oleg Nesterov , Sebastian Andrzej Siewior , linux-kernel@vger.kernel.org, Ben Segall , Daniel Bristot de Oliveira , Dietmar Eggemann , Ingo Molnar , Juri Lelli , Mel Gorman , Steven Rostedt , Thomas Gleixner , Vincent Guittot Subject: Re: [PATCH v2] ptrace: fix ptrace vs tasklist_lock race on PREEMPT_RT. Message-ID: References: <20220405102849.GA2708@redhat.com> <20220407121340.GA2762@worktop.programming.kicks-ass.net> <87v8vk8q4g.fsf@email.froward.int.ebiederm.org> <20220408090908.GO2731@worktop.programming.kicks-ass.net> <874k332wjp.fsf@email.froward.int.ebiederm.org> <87ee23zqdj.fsf@email.froward.int.ebiederm.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RDNS_NONE,SPF_HELO_NONE,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org For all who I forgot on the Cc list.. continued here: https://lkml.kernel.org/r/20220412114421.691372568@infradead.org (once it shows up, the web seems congested just now)