On 01/09/2018 03:42 AM, Michael Ellerman wrote: > Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx> writes: > >> On 01/07/2018 04:56 PM, Michael Ellerman wrote: >>> Michal Hocko <mhocko@xxxxxxxxxx> 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@xxxxxxxxxxxxxx >>>>>> 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. ================================================================================================= ELF Header: Magic: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 Class: ELF64 Data: 2's complement, little endian Version: 1 (current) OS/ABI: UNIX - System V ABI Version: 0 Type: EXEC (Executable file) Machine: PowerPC64 Version: 0x1 Entry point address: 0x10002b70 Start of program headers: 64 (bytes into file) Start of section headers: 135560 (bytes into file) Flags: 0x2, abiv2 Size of this header: 64 (bytes) Size of program headers: 56 (bytes) Number of program headers: 10 Size of section headers: 64 (bytes) Number of section headers: 28 Section header string table index: 27 Section Headers: [Nr] Name Type Address Offset Size EntSize Flags Link Info Align [ 0] NULL 0000000000000000 00000000 0000000000000000 0000000000000000 0 0 0 [ 1] .interp PROGBITS 0000000010000270 00000270 0000000000000011 0000000000000000 A 0 0 1 [ 2] .note.ABI-tag NOTE 0000000010000284 00000284 0000000000000020 0000000000000000 A 0 0 4 [ 3] .note.gnu.build-i NOTE 00000000100002a4 000002a4 0000000000000024 0000000000000000 A 0 0 4 [ 4] .gnu.hash GNU_HASH 00000000100002c8 000002c8 000000000000003c 0000000000000000 A 5 0 8 [ 5] .dynsym DYNSYM 0000000010000308 00000308 0000000000000a98 0000000000000018 A 6 1 8 [ 6] .dynstr STRTAB 0000000010000da0 00000da0 0000000000000456 0000000000000000 A 0 0 1 [ 7] .gnu.version VERSYM 00000000100011f6 000011f6 00000000000000e2 0000000000000002 A 5 0 2 [ 8] .gnu.version_r VERNEED 00000000100012d8 000012d8 0000000000000020 0000000000000000 A 6 1 8 [ 9] .rela.dyn RELA 00000000100012f8 000012f8 0000000000000168 0000000000000018 A 5 0 8 [10] .rela.plt RELA 0000000010001460 00001460 0000000000000948 0000000000000018 A 5 22 8 [11] .init PROGBITS 0000000010001dc0 00001dc0 000000000000004c 0000000000000000 AX 0 0 32 [12] .text PROGBITS 0000000010001e20 00001e20 000000000000e550 0000000000000000 AX 0 0 32 [13] .fini PROGBITS 0000000010010370 00010370 0000000000000024 0000000000000000 AX 0 0 4 [14] .rodata PROGBITS 0000000010010398 00010398 0000000000001738 0000000000000000 A 0 0 8 [15] .eh_frame_hdr PROGBITS 0000000010011ad0 00011ad0 00000000000004b4 0000000000000000 A 0 0 4 [16] .eh_frame PROGBITS 0000000010011f88 00011f88 0000000000001b04 0000000000000000 A 0 0 8 [17] .init_array INIT_ARRAY 000000001002fd40 0001fd40 0000000000000008 0000000000000000 WA 0 0 8 [18] .fini_array FINI_ARRAY 000000001002fd48 0001fd48 0000000000000008 0000000000000000 WA 0 0 8 [19] .jcr PROGBITS 000000001002fd50 0001fd50 0000000000000008 0000000000000000 WA 0 0 8 [20] .dynamic DYNAMIC 000000001002fd58 0001fd58 0000000000000200 0000000000000010 WA 6 0 8 [21] .got PROGBITS 000000001002ff58 0001ff58 00000000000000a8 0000000000000008 WA 0 0 8 [22] .plt NOBITS 0000000010030000 00020000 0000000000000328 0000000000000008 WA 0 0 8 [23] .data PROGBITS 0000000010030328 00020328 0000000000000384 0000000000000000 WA 0 0 8 [24] .bss NOBITS 00000000100306b0 000206ac 0000000000009118 0000000000000000 WA 0 0 8 [25] .gnu_debuglink PROGBITS 0000000000000000 000206ac 0000000000000010 0000000000000000 0 0 4 [26] .gnu_debugdata PROGBITS 0000000000000000 000206bc 00000000000009c4 0000000000000000 0 0 1 [27] .shstrtab STRTAB 0000000000000000 00021080 0000000000000104 0000000000000000 0 0 1 Key to Flags: W (write), A (alloc), X (execute), M (merge), S (strings), I (info), L (link order), O (extra OS processing required), G (group), T (TLS), C (compressed), x (unknown), o (OS specific), E (exclude), p (processor specific) There are no section groups in this file. Program Headers: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flags Align PHDR 0x0000000000000040 0x0000000010000040 0x0000000010000040 0x0000000000000230 0x0000000000000230 R E 8 INTERP 0x0000000000000270 0x0000000010000270 0x0000000010000270 0x0000000000000011 0x0000000000000011 R 1 [Requesting program interpreter: /lib64/ld64.so.2] LOAD 0x0000000000000000 0x0000000010000000 0x0000000010000000 0x0000000000013a8c 0x0000000000013a8c R E 10000 LOAD 0x000000000001fd40 0x000000001002fd40 0x000000001002fd40 0x00000000000002c0 0x00000000000005e8 RW 10000 LOAD 0x0000000000020328 0x0000000010030328 0x0000000010030328 0x0000000000000384 0x00000000000094a0 RW 10000 DYNAMIC 0x000000000001fd58 0x000000001002fd58 0x000000001002fd58 0x0000000000000200 0x0000000000000200 RW 8 NOTE 0x0000000000000284 0x0000000010000284 0x0000000010000284 0x0000000000000044 0x0000000000000044 R 4 GNU_EH_FRAME 0x0000000000011ad0 0x0000000010011ad0 0x0000000010011ad0 0x00000000000004b4 0x00000000000004b4 R 4 GNU_STACK 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 RW 10 GNU_RELRO 0x000000000001fd40 0x000000001002fd40 0x000000001002fd40 0x00000000000002c0 0x00000000000002c0 R 1 Section to Segment mapping: Segment Sections... 00 01 .interp 02 .interp .note.ABI-tag .note.gnu.build-id .gnu.hash .dynsym .dynstr .gnu.version .gnu.version_r .rela.dyn .rela.plt .init .text .fini .rodata .eh_frame_hdr .eh_frame 03 .init_array .fini_array .jcr .dynamic .got .plt 04 .data .bss 05 .dynamic 06 .note.ABI-tag .note.gnu.build-id 07 .eh_frame_hdr 08 09 .init_array .fini_array .jcr .dynamic .got Dynamic section at offset 0x1fd58 contains 27 entries: Tag Type Name/Value 0x0000000000000001 (NEEDED) Shared library: [libselinux.so.1] 0x0000000000000001 (NEEDED) Shared library: [libc.so.6] 0x000000000000000c (INIT) 0x10001dd0 0x000000000000000d (FINI) 0x10010370 0x0000000000000019 (INIT_ARRAY) 0x1002fd40 0x000000000000001b (INIT_ARRAYSZ) 8 (bytes) 0x000000000000001a (FINI_ARRAY) 0x1002fd48 0x000000000000001c (FINI_ARRAYSZ) 8 (bytes) 0x000000006ffffef5 (GNU_HASH) 0x100002c8 0x0000000000000005 (STRTAB) 0x10000da0 0x0000000000000006 (SYMTAB) 0x10000308 0x000000000000000a (STRSZ) 1110 (bytes) 0x000000000000000b (SYMENT) 24 (bytes) 0x0000000000000015 (DEBUG) 0x0 0x0000000000000003 (PLTGOT) 0x10030000 0x0000000000000002 (PLTRELSZ) 2376 (bytes) 0x0000000000000014 (PLTREL) RELA 0x0000000000000017 (JMPREL) 0x10001460 0x0000000070000000 (PPC64_GLINK) 0x100101a0 0x0000000070000003 (PPC64_OPT) 0x0 0x0000000000000007 (RELA) 0x100012f8 0x0000000000000008 (RELASZ) 360 (bytes) 0x0000000000000009 (RELAENT) 24 (bytes) 0x000000006ffffffe (VERNEED) 0x100012d8 0x000000006fffffff (VERNEEDNUM) 1 0x000000006ffffff0 (VERSYM) 0x100011f6 0x0000000000000000 (NULL) 0x0 Relocation section '.rela.dyn' at offset 0x12f8 contains 15 entries: Offset Info Type Sym. Value Sym. 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Symbol table '.dynsym' contains 113 entries: Num: Value Size Type Bind Vis Ndx Name 0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND 1: 0000000000000000 0 FUNC GLOBAL DEFAULT UND mbrtowc@GLIBC_2.17 (2) 2: 0000000000000000 0 FUNC GLOBAL DEFAULT UND memcpy@GLIBC_2.17 (2) 3: 0000000000000000 0 FUNC GLOBAL DEFAULT UND memmove@GLIBC_2.17 (2) 4: 0000000000000000 0 FUNC GLOBAL DEFAULT UND strlen@GLIBC_2.17 (2) 5: 0000000000000000 0 FUNC GLOBAL DEFAULT UND __sprintf_chk@GLIBC_2.17 (2) 6: 0000000000000000 0 FUNC GLOBAL DEFAULT UND exit@GLIBC_2.17 (2) 7: 0000000000000000 0 FUNC GLOBAL DEFAULT UND is_selinux_enabled 8: 0000000000000000 0 FUNC GLOBAL DEFAULT UND error@GLIBC_2.17 (2) 9: 0000000000000000 0 NOTYPE WEAK DEFAULT UND _ITM_deregisterTMCloneTab 10: 0000000000000000 0 FUNC GLOBAL DEFAULT UND readlink@GLIBC_2.17 (2) 11: 0000000000000000 0 FUNC GLOBAL DEFAULT UND ftell@GLIBC_2.17 (2) 12: 0000000000000000 0 OBJECT GLOBAL DEFAULT UND stderr@GLIBC_2.17 (2) 13: 0000000000000000 0 FUNC GLOBAL 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[<localentry>: 8] 13 _fini Histogram for `.gnu.hash' bucket list length (total of 3 buckets): Length Number % of total Coverage 0 0 ( 0.0%) 1 1 ( 33.3%) 16.7% 2 1 ( 33.3%) 50.0% 3 1 ( 33.3%) 100.0% Version symbols section '.gnu.version' contains 113 entries: Addr: 00000000100011f6 Offset: 0x0011f6 Link: 5 (.dynsym) 000: 0 (*local*) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 004: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 0 (*local*) 008: 2 (GLIBC_2.17) 0 (*local*) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 00c: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 010: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 014: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 018: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 0 (*local*) 01c: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 020: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 024: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 028: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 0 (*local*) 2 (GLIBC_2.17) 02c: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 030: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 034: 0 (*local*) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 038: 2 (GLIBC_2.17) 0 (*local*) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 03c: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 0 (*local*) 040: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 044: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 048: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 04c: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 050: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 054: 0 (*local*) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 058: 0 (*local*) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 05c: 0 (*local*) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 060: 0 (*local*) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 064: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 068: 2 (GLIBC_2.17) 2 (GLIBC_2.17) 2 (GLIBC_2.17) 1 (*global*) 06c: 1 (*global*) 2 (GLIBC_2.17) 1 (*global*) 1 (*global*) 070: 1 (*global*) Version needs section '.gnu.version_r' contains 1 entries: Addr: 0x00000000100012d8 Offset: 0x0012d8 Link: 6 (.dynstr) 000000: Version: 1 File: libc.so.6 Cnt: 1 0x0010: Name: GLIBC_2.17 Flags: none Version: 2 Displaying notes found at file offset 0x00000284 with length 0x00000020: Owner Data size Description GNU 0x00000010 NT_GNU_ABI_TAG (ABI version tag) OS: Linux, ABI: 2.6.32 Displaying notes found at file offset 0x000002a4 with length 0x00000024: Owner Data size Description GNU 0x00000014 NT_GNU_BUILD_ID (unique build ID bitstring) Build ID: a6c7b5f6f5cf4174f94bc7568ca07cfd81ee4443 ================================================================================================= -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at 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