From: Anshuman Khandual <khandual@linux.vnet.ibm.com>
To: Michal Hocko <mhocko@kernel.org>,
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: Thu, 11 Jan 2018 15:38:37 +0530 [thread overview]
Message-ID: <a495f210-0015-efb2-a6a7-868f30ac4ace@linux.vnet.ibm.com> (raw)
In-Reply-To: <20180109161355.GL1732@dhcp22.suse.cz>
On 01/09/2018 09:43 PM, Michal Hocko wrote:
> 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?
Not yet, will get back on this.
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next prev parent reply other threads:[~2018-01-11 10:08 UTC|newest]
Thread overview: 40+ 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
2018-01-11 10:08 ` Anshuman Khandual [this message]
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
2018-01-30 3:35 ` Michael Ellerman
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
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