From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk0-f198.google.com (mail-qk0-f198.google.com [209.85.220.198]) by kanga.kvack.org (Postfix) with ESMTP id 582966B027A for ; Sun, 7 Jan 2018 22:02:16 -0500 (EST) Received: by mail-qk0-f198.google.com with SMTP id h10so7722978qke.1 for ; Sun, 07 Jan 2018 19:02:16 -0800 (PST) Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com. [148.163.158.5]) by mx.google.com with ESMTPS id h52si9452416qte.369.2018.01.07.19.02.15 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 07 Jan 2018 19:02:15 -0800 (PST) Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.21) with SMTP id w082wv2I123664 for ; Sun, 7 Jan 2018 22:02:15 -0500 Received: from e06smtp15.uk.ibm.com (e06smtp15.uk.ibm.com [195.75.94.111]) by mx0b-001b2d01.pphosted.com with ESMTP id 2fby0qjr2c-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Sun, 07 Jan 2018 22:02:14 -0500 Received: from localhost by e06smtp15.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 8 Jan 2018 03:02:12 -0000 Subject: Re: ppc elf_map breakage with MAP_FIXED_NOREPLACE References: <5a4ec4bc.u5I/HzCSE6TLVn02%akpm@linux-foundation.org> <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> From: Anshuman Khandual Date: Mon, 8 Jan 2018 08:32:03 +0530 MIME-Version: 1.0 In-Reply-To: <87mv1phptq.fsf@concordia.ellerman.id.au> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Message-Id: <7a44f42e-39d0-1c4b-19e0-7df1b0842c18@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: Michael Ellerman , Michal Hocko , Anshuman Khandual Cc: 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 01/07/2018 04:56 PM, Michael Ellerman wrote: > Michal Hocko writes: > >> On Sun 07-01-18 12:19:32, Anshuman Khandual wrote: >>> On 01/05/2018 02:16 PM, Michal Hocko wrote: >> [...] >>>> Could you give us more information about the failure please. Debugging >>>> patch from http://lkml.kernel.org/r/20171218091302.GL16951@dhcp22.suse.cz >>>> should help to see what is the clashing VMA. >>> Seems like its re-requesting the same mapping again. >> It always seems to be the same mapping which is a bit strange as we >> have multiple binaries here. Are these binaries any special? Does this >> happen to all bianries (except for init which has obviously started >> successfully)? Could you add an additional debugging (at the do_mmap >> layer) to see who is requesting the mapping for the first time? >> >>> [ 23.423642] 9148 (sed): Uhuuh, elf segment at 0000000010030000 requested but the memory is mapped already >>> [ 23.423706] requested [10030000, 10040000] mapped [10030000, 10040000] 100073 anon >> I also find it a bit unexpected that this is an anonymous mapping >> because the elf loader should always map a file backed one. > Anshuman what machine is this on, and what distro and toolchain is it running? > > I don't see this on any of my machines, so I wonder if this is > toolchain/distro specific. POWER9, RHEL 7.4, gcc (GCC) 4.8.5 20150623, GNU Make 3.82 etc. -- 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