From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751293AbdGPMys (ORCPT ); Sun, 16 Jul 2017 08:54:48 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:33238 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751087AbdGPMyp (ORCPT ); Sun, 16 Jul 2017 08:54:45 -0400 Authentication-Results: collabora.co.uk; dkim=none (message not signed) header.d=none;collabora.co.uk; dmarc=none action=none header.from=fb.com; Date: Sun, 16 Jul 2017 13:53:54 +0100 From: Roman Gushchin To: Sebastian Reichel CC: Michal Hocko , Andrew Morton , Linus Torvalds , Tony Lindgren , Linux-Kernel , Linux-OMAP Subject: Re: Droid 4 boot failure due to 422580c3cea7 (mm/oom_kill.c: add tracepoints for oom reaper-related events) Message-ID: <20170716125354.GA20017@castle> References: <20170714134330.bsdoopceecuk5yem@earth> <20170714172343.szrjbeob5alpgzpe@earth> MIME-Version: 1.0 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1;BL2PR15MB1075;20:Z0l/LdSOd1gqu1fco7CwywXKqlrau+0xwSQCcXebEUe6zJV7Vhir79QME/Xxe7RUbK+pQeQOdxHGjl8A6ci6r/y0WJtWcuOb4gdYknMTIlsJM1bodxa1GFMn3H6HO6dXHcZfz+hsyw4BlFH7h7cbsia9t4vmgOtnRExIFtF2vz8= X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Jul 2017 12:54:08.8237 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL2PR15MB1075 X-OriginatorOrg: fb.com X-Proofpoint-Spam-Reason: safe X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-07-16_10:,, signatures=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jul 14, 2017 at 07:23:43PM +0200, Sebastian Reichel wrote: > Hi, > > On Fri, Jul 14, 2017 at 02:12:21PM +0000, Roman Gushchin wrote: > > > On 14 Jul 2017, at 14:43, Sebastian Reichel wrote: > > > I just bisected another issue breaking boot on Droid 4. My > > > bisect points to 422580c3cea7 (mm/oom_kill.c: add tracepoints > > > for oom reaper-related events). It do not see any message > > > printed to UART (with earlyprintk) once that commit is part > > > of my image. Kernel config is below. > > > This is really interesting, because this patch adds few > > tracepoints and all of them are called from the oom code, which is > > hopefully not a part of the boot process. > > > > Can you, please, confirm, that it can be reproduced with some > > confidence? If so, can you, please, eliminate the tracepoints > > calls and try to reproduce the boot failure? > > I can boot 9967468c0a10 ("Merge branch 'akpm' (patches from > Andrew)") after adding > > - http://git.kernel.org/tip/19d39a3810e7032f311ef83effdac40339b9d022 > (another issue, that breaks Droid 4 boot) > - a git revert of 422580c3cea7 > > OTOH there are strange problems. Using da16dd9785f8 + above > two commits also works. Using b5e16170f59b + above commits > does not work and bisection ended up in the merge commit. Hi, Sebastian! As commit 422580c3cea7 hasn't added any code, which is executed during the boot process, I could imagine only two options: 1) Added code/data occasionally broke some alignment/size contraints. 2) There is another instable bug, which compromised bisect results. Unfortunately, I can't help you with reproducing, because I haven't necessary hardware. Can you, please, try some older known to be good revision with the 422580c3cea7 patch applied? Roman