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=-0.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,T_MIXED_ES,URIBL_BLOCKED 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 32A51C5CFFE for ; Mon, 10 Dec 2018 18:19:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EC2CD2086D for ; Mon, 10 Dec 2018 18:19:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EC2CD2086D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=goodmis.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728590AbeLJSTh (ORCPT ); Mon, 10 Dec 2018 13:19:37 -0500 Received: from mail.kernel.org ([198.145.29.99]:37888 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726699AbeLJSTh (ORCPT ); Mon, 10 Dec 2018 13:19:37 -0500 Received: from gandalf.local.home (cpe-66-24-56-78.stny.res.rr.com [66.24.56.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BC4CE2081F; Mon, 10 Dec 2018 18:19:34 +0000 (UTC) Date: Mon, 10 Dec 2018 13:19:33 -0500 From: Steven Rostedt To: Ravi Bangoria Cc: "kernelci.org bot" , Srikar Dronamraju , tomeu.vizoso@collabora.com, guillaume.tucker@collabora.com, Oleg Nesterov , broonie@kernel.org, matthew.hart@linaro.org, khilman@baylibre.com, enric.balletbo@collabora.com, Namhyung Kim , Peter Zijlstra , linux-kernel@vger.kernel.org, Ingo Molnar , Jiri Olsa , Alexander Shishkin , Arnaldo Carvalho de Melo Subject: Re: mainline/master boot bisection: v4.20-rc5-79-gabb8d6ecbd8f on jetson-tk1 Message-ID: <20181210131933.53e3ae8a@gandalf.local.home> In-Reply-To: References: <5c09f05a.1c69fb81.95568.35c2@mx.google.com> X-Mailer: Claws Mail 3.16.0 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 10 Dec 2018 16:23:19 +0530 Ravi Bangoria wrote: > Hi, > > Can you please provide more details. I don't understand how this patch > can cause boot failure. > > >From the log found at > https://storage.kernelci.org/mainline/master/v4.20-rc5-79-gabb8d6ecbd8f/arm/multi_v7_defconfig+CONFIG_EFI=y+CONFIG_ARM_LPAE=y/lab-baylibre/boot-tegra124-jetson-tk1.html > > 23:21:06.680269 [ 7.500733] Unable to handle kernel NULL pointer dereference at virtual address 00000064 > 23:21:06.680455 [ 7.508893] pgd = (ptrval) > 23:21:06.721940 [ 7.511591] [00000064] *pgd=ad7d8003, *pmd=f9d5d003 > 23:21:06.722241 [ 7.516500] Internal error: Oops: 207 [#1] SMP ARM > ... > 23:21:06.722724 [ 7.546706] CPU: 0 PID: 122 Comm: udevd Not tainted 4.20.0-rc5 #1 > 23:21:06.722911 [ 7.552785] Hardware name: NVIDIA Tegra SoC (Flattened Device Tree) > 23:21:06.765203 [ 7.559045] PC is at drm_plane_register_all+0x18/0x50 > 23:21:06.765493 [ 7.564094] LR is at drm_modeset_register_all+0xc/0x6c > 23:21:06.765698 [ 7.569217] pc : [] lr : [] psr: a0000013 > 23:21:06.765882 [ 7.575470] sp : c3451c70 ip : 2d827000 fp : c1804c48 > 23:21:06.766053 [ 7.580680] r10: 00000000 r9 : ec9cc300 r8 : 00000000 > 23:21:06.766229 [ 7.585893] r7 : bf193c80 r6 : 00000000 r5 : c3694224 r4 : fffffffc > 23:21:06.766403 [ 7.592404] r3 : 00002000 r2 : 0002f000 r1 : eef92cf0 r0 : c3694000 > ... > 23:21:07.068237 [ 7.880215] [] (drm_plane_register_all) from [] (drm_modeset_register_all+0xc/0x6c) > 23:21:07.068493 [ 7.889603] [] (drm_modeset_register_all) from [] (drm_dev_register+0x16c/0x1c4) > 23:21:07.109960 [ 7.898915] [] (drm_dev_register) from [] (nouveau_platform_probe+0x54/0x8c [nouveau]) > 23:21:07.110285 [ 7.908750] [] (nouveau_platform_probe [nouveau]) from [] (platform_drv_probe+0x48/0x98) > 23:21:07.110515 [ 7.918572] [] (platform_drv_probe) from [] (really_probe+0x228/0x2d0) > 23:21:07.110706 [ 7.926832] [] (really_probe) from [] (driver_probe_device+0x60/0x174) > 23:21:07.110893 [ 7.935093] [] (driver_probe_device) from [] (__driver_attach+0xd0/0xd4) > 23:21:07.153794 [ 7.943528] [] (__driver_attach) from [] (bus_for_each_dev+0x74/0xb4) > 23:21:07.154133 [ 7.951688] [] (bus_for_each_dev) from [] (bus_add_driver+0x18c/0x210) > 23:21:07.154352 [ 7.959946] [] (bus_add_driver) from [] (driver_register+0x74/0x108) > 23:21:07.154544 [ 7.968212] [] (driver_register) from [] (nouveau_drm_init+0x170/0x1000 [nouveau]) > 23:21:07.154739 [ 7.977692] [] (nouveau_drm_init [nouveau]) from [] (do_one_initcall+0x54/0x1fc) > 23:21:07.197008 [ 7.986820] [] (do_one_initcall) from [] (do_init_module+0x64/0x1f4) > 23:21:07.197344 [ 7.994906] [] (do_init_module) from [] (load_module+0x1ee8/0x23c8) > 23:21:07.197553 [ 8.002907] [] (load_module) from [] (sys_finit_module+0xac/0xd8) > 23:21:07.197751 [ 8.010722] [] (sys_finit_module) from [] (ret_fast_syscall+0x0/0x4c) > 23:21:07.197935 [ 8.018884] Exception stack(0xc3451fa8 to 0xc3451ff0) > > > Both PC and LR are pointing to drm_* code. I don't see this anyway related to > uprobes. Did I miss anything? > The bot sometimes gets confused during the bisect. This looks to be one of those times. I'd simply ignore it because the code path of the commit it points out is obviously never hit. The bug may be a race condition that will cause havoc with automated bisects. -- Steve