From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Wed, 31 Jan 2018 14:19:37 +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: <20180131131937.GA6740@dhcp22.suse.cz> References: <2a05eaf2-20fd-57a8-d4bd-5a1fbf57686c@linux.vnet.ibm.com> <20180124090539.GH1526@dhcp22.suse.cz> <5acba3c2-754d-e449-24ff-a72a0ad0d895@linux.vnet.ibm.com> <20180126140415.GD5027@dhcp22.suse.cz> <15da8c87-e6db-13aa-01c8-a913656bfdb6@linux.vnet.ibm.com> <6db9b33d-fd46-c529-b357-3397926f0733@linux.vnet.ibm.com> <20180129132235.GE21609@dhcp22.suse.cz> <87k1w081e7.fsf@concordia.ellerman.id.au> <20180130094205.GS21609@dhcp22.suse.cz> <5eccdc1b-6a10-b48a-c63f-295f69473d97@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5eccdc1b-6a10-b48a-c63f-295f69473d97@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: On Wed 31-01-18 10:35:38, Anshuman Khandual wrote: > On 01/30/2018 03:12 PM, Michal Hocko wrote: [...] > > Anshuman, could you try to run > > sed 's@^@@' /proc/self/smaps > > on a system with MAP_FIXED_NOREPLACE reverted? > > > > After reverting the following commits from mmotm-2018-01-25-16-20 tag. > > 67caea694ba5965a52a61fdad495d847f03c4025 ("mm-introduce-map_fixed_safe-fix") > 64da2e0c134ecf3936a4c36b949bcf2cdc98977e ("fs-elf-drop-map_fixed-usage-from-elf_map-fix-fix") > 645983ab6ca7fd644f52b4c55462b91940012595 ("mm: don't use the same value for MAP_FIXED_NOREPLACE and MAP_SYNC") > d77bab291ac435aab91fa214b85efa74a26c9c22 ("fs-elf-drop-map_fixed-usage-from-elf_map-checkpatch-fixes") > a75c5f92d9ecb21d3299cc7db48e401cbf335c34 ("fs, elf: drop MAP_FIXED usage from elf_map") > 00906d029ffe515221e3939b222c237026af2903 ("mm: introduce MAP_FIXED_NOREPLACE") > > $sed 's@^@@' /proc/self/smaps Interesting > ------------------------------------------- > 10000000-10020000 r-xp 00000000 fd:00 10558 /usr/bin/sed > 10020000-10030000 r--p 00010000 fd:00 10558 /usr/bin/sed > 10030000-10040000 rw-p 00020000 fd:00 10558 /usr/bin/sed > 2cbb0000-2cbe0000 rw-p 00000000 00:00 0 [heap] We still have a brk and at a different offset. Could you confirm that we still try to map previous brk at the clashing address 0x10030000? > 7fff7f9c0000-7fff7f9e0000 rw-p 00000000 00:00 0 > 7fff7f9e0000-7fff86280000 r--p 00000000 fd:00 33660156 /usr/lib/locale/locale-archive > 7fff86280000-7fff86290000 r-xp 00000000 fd:00 33660115 /usr/lib64/libdl-2.17.so > 7fff86290000-7fff862a0000 r--p 00000000 fd:00 33660115 /usr/lib64/libdl-2.17.so > 7fff862a0000-7fff862b0000 rw-p 00010000 fd:00 33660115 /usr/lib64/libdl-2.17.so > 7fff862b0000-7fff86300000 r-xp 00000000 fd:00 33594504 /usr/lib64/libpcre.so.1.2.0 > 7fff86300000-7fff86310000 r--p 00040000 fd:00 33594504 /usr/lib64/libpcre.so.1.2.0 > 7fff86310000-7fff86320000 rw-p 00050000 fd:00 33594504 /usr/lib64/libpcre.so.1.2.0 > 7fff86320000-7fff864f0000 r-xp 00000000 fd:00 33660109 /usr/lib64/libc-2.17.so > 7fff864f0000-7fff86500000 r--p 001c0000 fd:00 33660109 /usr/lib64/libc-2.17.so > 7fff86500000-7fff86510000 rw-p 001d0000 fd:00 33660109 /usr/lib64/libc-2.17.so > 7fff86510000-7fff86540000 r-xp 00000000 fd:00 33594516 /usr/lib64/libselinux.so.1 > 7fff86540000-7fff86550000 r--p 00020000 fd:00 33594516 /usr/lib64/libselinux.so.1 > 7fff86550000-7fff86560000 rw-p 00030000 fd:00 33594516 /usr/lib64/libselinux.so.1 > 7fff86560000-7fff86570000 r--s 00000000 fd:00 67194934 /usr/lib64/gconv/gconv-modules.cache > 7fff86570000-7fff86590000 r-xp 00000000 00:00 0 [vdso] > 7fff86590000-7fff865c0000 r-xp 00000000 fd:00 33660102 /usr/lib64/ld-2.17.so > 7fff865c0000-7fff865d0000 r--p 00020000 fd:00 33660102 /usr/lib64/ld-2.17.so > 7fff865d0000-7fff865e0000 rw-p 00030000 fd:00 33660102 /usr/lib64/ld-2.17.so > 7fffd27a0000-7fffd27d0000 rw-p 00000000 00:00 0 [stack] -- 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