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=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 CF530C433DF for ; Sat, 13 Jun 2020 07:27:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B453B20739 for ; Sat, 13 Jun 2020 07:27:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726414AbgFMH1N (ORCPT ); Sat, 13 Jun 2020 03:27:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41774 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725771AbgFMH1N (ORCPT ); Sat, 13 Jun 2020 03:27:13 -0400 Received: from Galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E0526C03E96F for ; Sat, 13 Jun 2020 00:27:12 -0700 (PDT) Received: from p5de0bf0b.dip0.t-ipconnect.de ([93.224.191.11] helo=nanos.tec.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1jk0Yr-0006Ly-GS; Sat, 13 Jun 2020 09:26:41 +0200 Received: by nanos.tec.linutronix.de (Postfix, from userid 1000) id C5C5E1013D0; Sat, 13 Jun 2020 09:26:40 +0200 (CEST) From: Thomas Gleixner To: paulmck@kernel.org, Peter Zijlstra Cc: mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, linux-kernel@vger.kernel.org Subject: Re: BUG: kernel NULL pointer dereference from check_preempt_wakeup() In-Reply-To: <20200613024829.GA12958@paulmck-ThinkPad-P72> References: <20200604225445.GA32319@paulmck-ThinkPad-P72> <20200605131451.GE2750@hirez.programming.kicks-ass.net> <20200605141607.GB4455@paulmck-ThinkPad-P72> <20200605184159.GA4062@paulmck-ThinkPad-P72> <20200606005126.GA21507@paulmck-ThinkPad-P72> <20200606172942.GA30594@paulmck-ThinkPad-P72> <20200607185732.GA18906@paulmck-ThinkPad-P72> <20200609154016.GA17196@paulmck-ThinkPad-P72> <20200613024829.GA12958@paulmck-ThinkPad-P72> Date: Sat, 13 Jun 2020 09:26:40 +0200 Message-ID: <87ftazctov.fsf@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org "Paul E. McKenney" writes: > And an update based on your patch (https://paste.debian.net/1151802/) > against 44ebe016df3a ("Merge branch 'proc-linus' of > git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace"). I'm running this patch since midnight on top of x86/entry. Still no NULL pointer deref. The cross-check with plain x86/entry has triggered it on all instances by now. So it looks your up to something here. Thanks, Thomas