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

[Vlastimil Babka]

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@xxxxxxxxxx>
> 
> Acked-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
> 
> 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.