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=-4.1 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 4AD86C433DF for ; Fri, 14 Aug 2020 11:58:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 24427207DA for ; Fri, 14 Aug 2020 11:58:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="RlIJGJTA"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="NovBDUKQ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726538AbgHNL6x (ORCPT ); Fri, 14 Aug 2020 07:58:53 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:36410 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726185AbgHNL6x (ORCPT ); Fri, 14 Aug 2020 07:58:53 -0400 Date: Fri, 14 Aug 2020 13:58:48 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1597406330; 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=GcCjjjpshN+VO1dI+U0IUtgW/jCZhOJYWs5NIGoP2mc=; b=RlIJGJTArMiAifulo1TBtaON6WivdnirLfUy66WgbeWdSs6i3jjQDJ2Ih61d2FHjHJCBUB FDpN3pBKr1fkbfTnhGYqHnZfV9lFNyz4LomYGRW5NNwWF3YNHFivdSjn9/Gv1hv+5lDT6r OG+g7z6RKBI1Zj0rOFekWuLpm8uiCyidr6yevQwuZKnKTkYqincx8TMnD0fB0y6lg8ZLab jHFoo7rUX8EXcgR7PJxlZXKz1ZV9f4m6OCmr3pKntRV7jkWPi9fU2JciNYu9qz06miA2gl 2JMMtD46wqsYQ7jhAjQmllzvT2jAj3+zdBaR6OexhA3Zv+0DXoI3WRmd7HIQkQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1597406330; 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=GcCjjjpshN+VO1dI+U0IUtgW/jCZhOJYWs5NIGoP2mc=; b=NovBDUKQqfOHJRdqlEuuLt5DPuNfXkNuKG/DT5VYDlfFoIryvb8uevOj5cDK8qD427UHOZ 0P8vkqUH54vSAyDA== From: Sebastian Andrzej Siewior To: Roosen Henri Cc: "linux-rt-users@vger.kernel.org" , Clark Williams Subject: Re: RT kernel v4.14 NULL pointer dereferences Message-ID: <20200814115848.w4m2bfqttkid6woi@linutronix.de> References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Sender: linux-rt-users-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org On 2020-06-16 07:30:33 [+0000], Roosen Henri wrote: > Hi RT-experts, > > Duration tests with RT enabled v4.14 kernels on our ARM iMX6Q systems > are showing "Unable to handle kernel NULL pointer dereference at > virtual address" after running for some months. The same tests on NON- > RT kernels don't show any problem and have been running without any > problems for more than 20 months now. > > I've been updating the tests from time to time with more recent > kernels. Testing is basically done with cyclictest, in parallel with > some load scripts/hackbench. Please have a look at the kernel traces: > 4.14.71-rt44 -> https://paste.debian.net/1152206/ > 4.14.106-rt56 -> https://paste.debian.net/1152204/ > 4.14.146-rt67 -> https://paste.debian.net/1152202/ > > I've seen the v4.14-rt branch got some fixes, so my questions are: > 1) is problem I'm facing known and fixed in v4.14-rt, or > 2) is the problem I'm seeing a new issue probably still unfixed in > 4.14.183-rt83 (which I'm testing right now)? > > Any help is highly appreciated! So this has not fixed all by itself? Is the 4.14 series the only one that is affected? > Thanks, > Henri Sebastian