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

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Message-ID: <00a73cf9-b2e8-116b-dc9c-fc5e2aacb1a1@suse.cz>
Date:   Tue, 31 Aug 2021 18:34:26 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Mel Gorman <mgorman@...hsingularity.net>,
        Miaohe Lin <linmiaohe@...wei.com>
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 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.