From mboxrd@z Thu Jan 1 00:00:00 1970 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934303AbeAIQOB (ORCPT + 1 other); Tue, 9 Jan 2018 11:14:01 -0500 Received: from mx2.suse.de ([195.135.220.15]:42793 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934267AbeAIQN6 (ORCPT ); Tue, 9 Jan 2018 11:13:58 -0500 Date: Tue, 9 Jan 2018 17:13:55 +0100 From: Michal Hocko To: 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 Subject: Re: ppc elf_map breakage with MAP_FIXED_NOREPLACE Message-ID: <20180109161355.GL1732@dhcp22.suse.cz> 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> <7a44f42e-39d0-1c4b-19e0-7df1b0842c18@linux.vnet.ibm.com> <87tvvw80f2.fsf@concordia.ellerman.id.au> <96458c0a-e273-3fb9-a33b-f6f2d536f90b@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <96458c0a-e273-3fb9-a33b-f6f2d536f90b@linux.vnet.ibm.com> User-Agent: Mutt/1.9.2 (2017-12-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: On Tue 09-01-18 17:18:38, Anshuman Khandual wrote: > On 01/09/2018 03:42 AM, Michael Ellerman wrote: > > Anshuman Khandual writes: > > > >> 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. > > > > So what does readelf -a of /bin/sed look like? > > Please find here. Did you manage to catch _who_ is requesting that anonymous mapping? Do you need a help with the debugging patch? -- Michal Hocko SUSE Labs From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Tue, 9 Jan 2018 17:13:55 +0100 From: Michal Hocko To: 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 Subject: Re: ppc elf_map breakage with MAP_FIXED_NOREPLACE Message-ID: <20180109161355.GL1732@dhcp22.suse.cz> 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> <7a44f42e-39d0-1c4b-19e0-7df1b0842c18@linux.vnet.ibm.com> <87tvvw80f2.fsf@concordia.ellerman.id.au> <96458c0a-e273-3fb9-a33b-f6f2d536f90b@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <96458c0a-e273-3fb9-a33b-f6f2d536f90b@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: On Tue 09-01-18 17:18:38, Anshuman Khandual wrote: > On 01/09/2018 03:42 AM, Michael Ellerman wrote: > > Anshuman Khandual writes: > > > >> 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. > > > > So what does readelf -a of /bin/sed look like? > > Please find here. Did you manage to catch _who_ is requesting that anonymous mapping? Do you need a help with the debugging patch? -- Michal Hocko SUSE Labs -- 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