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    SubjectRe: ppc elf_map breakage with MAP_FIXED_NOREPLACE
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    Anshuman Khandual <khandual@linux.vnet.ibm.com> writes:

    > On 01/07/2018 04:56 PM, Michael Ellerman wrote:
    >> Michal Hocko <mhocko@kernel.org> 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?

    cheers

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