From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751234AbeAWLZp (ORCPT ); Tue, 23 Jan 2018 06:25:45 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:43602 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751086AbeAWLZn (ORCPT ); Tue, 23 Jan 2018 06:25:43 -0500 Subject: Re: ppc elf_map breakage with MAP_FIXED_NOREPLACE To: Michal Hocko , Anshuman Khandual 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> 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 From: Anshuman Khandual Date: Tue, 23 Jan 2018 16:55:18 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 MIME-Version: 1.0 In-Reply-To: <20180117080731.GA2900@dhcp22.suse.cz> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 18012311-0012-0000-0000-000005A6D09C X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18012311-0013-0000-0000-0000192257E7 Message-Id: <082aa008-c56a-681d-0949-107245603a97@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2018-01-23_03:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1801230157 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.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 ? From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Subject: Re: ppc elf_map breakage with MAP_FIXED_NOREPLACE To: Michal Hocko , Anshuman Khandual 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> 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 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: 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