linux-kernel - Re: [PATCH 5/6] mm/page_alloc.c: avoid accessing uninitialized pcp page migratetype

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Date:   Wed, 1 Sep 2021 16:04:30 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>
CC:     <akpm@...ux-foundation.org>, <sfr@...b.auug.org.au>,
        <peterz@...radead.org>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/6] mm/page_alloc.c: avoid accessing uninitialized pcp
 page migratetype

On 2021/9/1 0:34, Vlastimil Babka wrote:
> On 8/31/21 15:43, Mel Gorman wrote:
>> On Mon, Aug 30, 2021 at 10:10:50PM +0800, Miaohe Lin wrote:
>>> If it's not prepared to free unref page, the pcp page migratetype is
>>> unset. Thus We will get rubbish from get_pcppage_migratetype() and
>>> might list_del &page->lru again after it's already deleted from the
>>> list leading to grumble about data corruption.
>>>
>>> Fixes: 3dcbe270d8ec ("mm/page_alloc: avoid conflating IRQs disabled with zone->lock")
>>> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
>>
>> Acked-by: Mel Gorman <mgorman@...hsingularity.net>
>>
>> This fix is fairly important. Take this patch out and send it on its own
>> so it gets picked up relatively quickly. It does not belong in a series
>> that is mostly cosmetic cleanups.
> 
> Also Cc: stable, please.
> 
> 

Will do. Many thanks for both of your suggestions!

> 
> .
>