linux-kernel - Re: [PATCH] n_tty: use kmalloc() instead of vmalloc() to avoid crash on armada-xp

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Message-ID: <5501B1ED.10600@arm.com>
Date:	Thu, 12 Mar 2015 15:34:05 +0000
From:	Vladimir Murzin <vladimir.murzin@....com>
To:	Stas Sergeev <stsp@...t.ru>,
	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Catalin Marinas <Catalin.Marinas@....com>,
	Peter Hurley <peter@...leysoftware.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] n_tty: use kmalloc() instead of vmalloc() to avoid crash
 on armada-xp

On 12/03/15 13:11, Stas Sergeev wrote:
> 12.03.2015 16:04, Russell King - ARM Linux пишет:
>> On Thu, Mar 12, 2015 at 03:47:35PM +0300, Stas Sergeev wrote:
>>> 12.03.2015 15:33, Peter Hurley пишет:
>>>> On 03/11/2015 10:24 AM, Stas Sergeev wrote:
>>>>> However, while testing, I've suddenly got another crash happened
>>>>> a bit earlier than the previous one used to happen: (OOM? How??)
>>>>> ---
>>>>> [    0.000000] Booting Linux on physical CPU 0x0
>>>>> [    0.000000] Linux version 4.0.0-rc2-00137-gb672c98-dirty
>>>>> (root@...t-010-117) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) )
>>>>> #2 SMP 5
>>>>> [    0.000000] CPU: ARMv7 Processor [562f5842] revision 2 (ARMv7),
>>>>> cr=10c5387d
>>>>> [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, PIPT instruction
>>>>> cache
>>>>> [    0.000000] Machine model: Marvell Armada XP Development Board
>>>>> DB-MV784MP-GP
>>>>> [    0.000000] Ignoring memory block 0x100000000 - 0x200000000
>>>> Once you patch your bootloader, you'll want to configure your kernel
>>>> for CONFIG_ARM_LPAE=y to enable the high 4GB of memory you have, as
>>>> it's being ignored in this config right now (as shown above and in
>>>> the oom message below).
>>> Hi Peter, thanks for this hint.
>>> I actually already tried with lpae, and, except for the missing
>>> 256Mb, everything works properly. :)
>> How reproducable is the OOM?  Have you tested LPAE as much as you did
>> without LPAE?
> Hi Russel, OOM is reproduceable quite fine only on old uboot
> and non-lpae mode.
> With lpae mode and old uboot OOM doesn't happen, but the board is not
> very reliable.
> With old uboot and mem=3G OOM is not reproduceable!
> With new uboot and whatever lpae more, OOM does not happen.
> So, after all, it still seems to be related to the problematic memory
> region. Let me know if you still suspect a bug and need more testing.
> 

Hi Stas,

Recently, I've done some work on memtest kernel feature [1]. It helped
to track down an issue with memory corruption on arm64 platform.

I wonder if it is able to catch your case?

[1] http://comments.gmane.org/gmane.linux.kernel.mm/129669

Thanks
Vladimir

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> linux-arm-kernel@...ts.infradead.org
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> 

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