linux-kernel - Re: mmotm 2015-01-22-15-04: qemu failures due to 'mm: account pmd page tables to the process'

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Date:	Fri, 23 Jan 2015 07:07:56 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
CC:	akpm@...ux-foundation.org, mm-commits@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-next@...r.kernel.org,
	sfr@...b.auug.org.au, mhocko@...e.cz,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: mmotm 2015-01-22-15-04: qemu failures due to 'mm: account pmd
 page tables to the process'

On 01/23/2015 03:13 AM, Kirill A. Shutemov wrote:
> On Thu, Jan 22, 2015 at 09:04:45PM -0800, Guenter Roeck wrote:
>> On Thu, Jan 22, 2015 at 03:05:17PM -0800, akpm@...ux-foundation.org wrote:
>>> The mm-of-the-moment snapshot 2015-01-22-15-04 has been uploaded to
>>>
>>>     http://www.ozlabs.org/~akpm/mmotm/
>>>
>> qemu:sh fails to shut down.
>>
>> bisect log:
>>
>> # bad: [03586ad04b2170ee816e6936981cc7cd2aeba129] pci: test for unexpectedly disabled bridges
>> # good: [ec6f34e5b552fb0a52e6aae1a5afbbb1605cc6cc] Linux 3.19-rc5
>> git bisect start 'HEAD' 'v3.19-rc5'
>> # bad: [d113ba21d15c7d3615fd88490d1197615bb39fc0] mm: remove lock validation check for MADV_FREE
>> git bisect bad d113ba21d15c7d3615fd88490d1197615bb39fc0
>> # good: [17351d1625a5030fa16f1346b77064c03b51f107] mm:add KPF_ZERO_PAGE flag for /proc/kpageflags
>> git bisect good 17351d1625a5030fa16f1346b77064c03b51f107
>> # good: [ad18ad1fce6f241a9cbd4adfd6b16c9283181e39] memcg: add BUILD_BUG_ON() for string tables
>> git bisect good ad18ad1fce6f241a9cbd4adfd6b16c9283181e39
>> # bad: [aa7e7cbfa43b74f6faef04ff730b5098544a4f77] mm/compaction: enhance tracepoint output for compaction begin/end
>> git bisect bad aa7e7cbfa43b74f6faef04ff730b5098544a4f77
>> # good: [a40d0d2cf21e2714e9a6c842085148c938bf36ab] mm: memcontrol: remove unnecessary soft limit tree node test
>> git bisect good a40d0d2cf21e2714e9a6c842085148c938bf36ab
>> # good: [4ec4aa2e07c1d6eee61f6cace29401c6febcb6c5] mm: make FIRST_USER_ADDRESS unsigned long on all archs
>> git bisect good 4ec4aa2e07c1d6eee61f6cace29401c6febcb6c5
>> # bad: [22310c209483224a64436a6e815a86feda681659] mm: account pmd page tables to the process
>> git bisect bad 22310c209483224a64436a6e815a86feda681659
>> # good: [19a41261b1dcd8d12372d9c57c2035144608a599] arm: define __PAGETABLE_PMD_FOLDED for !LPAE
>> git bisect good 19a41261b1dcd8d12372d9c57c2035144608a599
>> # first bad commit: [22310c209483224a64436a6e815a86feda681659] mm: account pmd page tables to the process
>>
>> ---
>>
>> qemu:microblaze generates warnings to the console.
>>
>> WARNING: CPU: 0 PID: 32 at mm/mmap.c:2858 exit_mmap+0x184/0x1a4()
>>
>> with various call stacks. See
>> http://server.roeck-us.net:8010/builders/qemu-microblaze-mmotm/builds/15/steps/qemubuildcommand/logs/stdio
>> for details.
>
> Could you try patch below? Completely untested.
>
>>>From b584bb8d493794f67484c0b57c161d61c02599bc Mon Sep 17 00:00:00 2001
> From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
> Date: Fri, 23 Jan 2015 13:08:26 +0200
> Subject: [PATCH] microblaze: define __PAGETABLE_PMD_FOLDED
>
> Microblaze uses custom implementation of PMD folding, but doesn't define
> __PAGETABLE_PMD_FOLDED, which generic code expects to see. Let's fix it.
>
> Defining __PAGETABLE_PMD_FOLDED will drop out unused __pmd_alloc().
> It also fixes problems with recently-introduced pmd accounting.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Reported-by: Guenter Roeck <linux@...ck-us.net>

Tested working.

Tested-by: Guenter Roeck <linux@...ck-us.net>

Any idea how to fix the sh problem ?

Thanks,
Guenter

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