From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-f199.google.com (mail-qt0-f199.google.com [209.85.216.199]) by kanga.kvack.org (Postfix) with ESMTP id 9481D800D8 for ; Tue, 23 Jan 2018 06:25:44 -0500 (EST) Received: by mail-qt0-f199.google.com with SMTP id d15so172144qtg.2 for ; Tue, 23 Jan 2018 03:25:44 -0800 (PST) Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com. [148.163.158.5]) by mx.google.com with ESMTPS id g21si5541751qke.137.2018.01.23.03.25.43 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 23 Jan 2018 03:25:43 -0800 (PST) Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w0NBOemt145031 for ; Tue, 23 Jan 2018 06:25:43 -0500 Received: from e06smtp13.uk.ibm.com (e06smtp13.uk.ibm.com [195.75.94.109]) by mx0b-001b2d01.pphosted.com with ESMTP id 2fp2vv3gy6-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 23 Jan 2018 06:25:42 -0500 Received: from localhost by e06smtp13.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 23 Jan 2018 11:25:41 -0000 Subject: Re: ppc elf_map breakage with MAP_FIXED_NOREPLACE References: <7e35e16a-d71c-2ec8-03ed-b07c2af562f8@linux.vnet.ibm.com> <20180105084631.GG2801@dhcp22.suse.cz> <20180107090229.GB24862@dhcp22.suse.cz> <87mv1phptq.fsf@concordia.ellerman.id.au> <7a44f42e-39d0-1c4b-19e0-7df1b0842c18@linux.vnet.ibm.com> <87tvvw80f2.fsf@concordia.ellerman.id.au> <96458c0a-e273-3fb9-a33b-f6f2d536f90b@linux.vnet.ibm.com> <20180109161355.GL1732@dhcp22.suse.cz> <20180117080731.GA2900@dhcp22.suse.cz> From: Anshuman Khandual Date: Tue, 23 Jan 2018 16:55:18 +0530 MIME-Version: 1.0 In-Reply-To: <20180117080731.GA2900@dhcp22.suse.cz> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Message-Id: <082aa008-c56a-681d-0949-107245603a97@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: Michal Hocko , Anshuman Khandual Cc: Michael Ellerman , akpm@linux-foundation.org, mm-commits@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-next@vger.kernel.org, sfr@canb.auug.org.au, broonie@kernel.org On 01/17/2018 01:37 PM, Michal Hocko wrote: > On Thu 11-01-18 15:38:37, Anshuman Khandual wrote: >> On 01/09/2018 09:43 PM, Michal Hocko wrote: > [...] >>> Did you manage to catch _who_ is requesting that anonymous mapping? Do >>> you need a help with the debugging patch? >> >> Not yet, will get back on this. > > ping? Hey Michal, Missed this thread, my apologies. This problem is happening only with certain binaries like 'sed', 'tmux', 'hostname', 'pkg-config' etc. As you had mentioned before the map request collision is happening on [10030000, 10040000] and [10030000, 10040000] ranges only which is just a single PAGE_SIZE. You asked previously that who might have requested the anon mapping which is already present in there ? Would not that be the same process itself ? I am bit confused. Would it be helpful to trap all the mmap() requests from any of the binaries and see where we might have created that anon mapping ? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org