linux-kernel - Re: [Question] race condition in mm/page

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Message-ID: <z2x28c262361004012215h2b2ea3dbu5260724f97f55b95@mail.gmail.com>
Date:	Fri, 2 Apr 2010 14:15:56 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	TAO HU <tghk48@...orola.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	"Ye Yuan.Bo-A22116" <yuan-bo.ye@...orola.com>,
	Chang Qing-A21550 <Qing.Chang@...orola.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [Question] race condition in mm/page_alloc.c regarding page->lru?

On Fri, Apr 2, 2010 at 2:04 PM, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@...fujitsu.com> wrote:
> On Fri, 2 Apr 2010 11:51:33 +0800
> TAO HU <tghk48@...orola.com> wrote:
>
>> 2 patches related to page_alloc.c were applied.
>> Does anyone see a connection between the 2 patches and the panic?
>> NOTE: the full patches are attached.
>>
>
> I don't think there are relationship between patches and your panic.
>
> BTW, there is other case about the backlog rather than race in alloc_pages()
> itself. If someone list_del(&page->lru) and the page is already freed,
> you'll see the same backlog later.
> Then, I doubt use-after-free case rather than complicated races.

It does make sense.
Please, grep "page handling" by out-of-mainline code.
If you found out, Please, post it.

-- 
Kind regards,
Minchan Kim
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