From: Michal Hocko <mhocko@kernel.org>
To: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>,
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
Date: Tue, 9 Jan 2018 17:13:55 +0100 [thread overview]
Message-ID: <20180109161355.GL1732@dhcp22.suse.cz> (raw)
In-Reply-To: <96458c0a-e273-3fb9-a33b-f6f2d536f90b@linux.vnet.ibm.com>
On Tue 09-01-18 17:18:38, Anshuman Khandual wrote:
> On 01/09/2018 03:42 AM, Michael Ellerman wrote:
> > 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?
>
> 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
next prev parent reply other threads:[~2018-01-09 16:14 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-05 0:20 mmotm 2018-01-04-16-19 uploaded akpm
2018-01-05 6:43 ` Anshuman Khandual
2018-01-05 8:46 ` Michal Hocko
2018-01-07 6:49 ` Anshuman Khandual
2018-01-07 9:02 ` ppc elf_map breakage with MAP_FIXED_NOREPLACE (was: Re: mmotm 2018-01-04-16-19 uploaded) Michal Hocko
2018-01-07 11:26 ` Michael Ellerman
2018-01-08 3:02 ` ppc elf_map breakage with MAP_FIXED_NOREPLACE Anshuman Khandual
2018-01-08 22:12 ` Michael Ellerman
2018-01-09 11:48 ` Anshuman Khandual
2018-01-09 16:13 ` Michal Hocko [this message]
2018-01-11 10:08 ` Anshuman Khandual
2018-01-17 8:07 ` Michal Hocko
2018-01-23 11:25 ` Anshuman Khandual
2018-01-23 12:45 ` Michal Hocko
2018-01-23 15:58 ` Anshuman Khandual
2018-01-23 16:06 ` Michal Hocko
2018-01-24 5:09 ` Anshuman Khandual
2018-01-24 9:05 ` Michal Hocko
2018-01-26 12:34 ` Anshuman Khandual
2018-01-26 14:04 ` Michal Hocko
2018-01-29 2:47 ` Anshuman Khandual
2018-01-29 5:32 ` Anshuman Khandual
2018-01-29 13:22 ` Michal Hocko
[not found] ` <87k1w081e7.fsf@concordia.ellerman.id.au>
2018-01-30 9:42 ` Michal Hocko
2018-01-31 5:05 ` Anshuman Khandual
2018-01-31 13:19 ` Michal Hocko
2018-02-01 3:13 ` Anshuman Khandual
2018-02-01 13:10 ` Michal Hocko
2018-02-01 13:40 ` Michal Hocko
2018-02-01 20:55 ` Kees Cook
2018-02-13 10:04 ` [RFC PATCH] elf: enforce MAP_FIXED on overlaying elf segments (was: Re: ppc elf_map breakage with MAP_FIXED_NOREPLACE) Michal Hocko
2018-02-14 16:30 ` Khalid Aziz
2018-02-01 13:48 ` ppc elf_map breakage with MAP_FIXED_NOREPLACE Michal Hocko
2018-02-01 21:06 ` Kees Cook
2018-02-12 14:48 ` Michal Hocko
2018-02-13 1:02 ` Anshuman Khandual
2018-02-13 6:49 ` Anshuman Khandual
2018-02-13 10:00 ` Michal Hocko
2018-01-05 12:14 ` mmotm 2018-01-04-16-19 uploaded Michal Hocko
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180109161355.GL1732@dhcp22.suse.cz \
--to=mhocko@kernel.org \
--cc=akpm@linux-foundation.org \
--cc=broonie@kernel.org \
--cc=khandual@linux.vnet.ibm.com \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-next@vger.kernel.org \
--cc=mm-commits@vger.kernel.org \
--cc=mpe@ellerman.id.au \
--cc=sfr@canb.auug.org.au \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).