linux-kernel - Re: [PATCH 1/7] mm: fix the deadlock in finish

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Message-ID: <b4dc16f4-faf0-7af6-7853-5f54fef77b02@bytedance.com>
Date:   Wed, 21 Jul 2021 10:21:47 +0800
From:   Qi Zheng <zhengqi.arch@...edance.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     "Kirill A. Shutemov" <kirill@...temov.name>, tglx@...utronix.de,
        hannes@...xchg.org, mhocko@...nel.org, vdavydov.dev@...il.com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, songmuchun@...edance.com
Subject: Re: [PATCH 1/7] mm: fix the deadlock in finish_fault()



On 7/21/21 7:14 AM, Andrew Morton wrote:
> On Mon, 19 Jul 2021 17:53:12 +0800 Qi Zheng <zhengqi.arch@...edance.com> wrote:
> 
>>
>>
>> On 7/19/21 5:28 AM, Kirill A. Shutemov wrote:
>>> On Sun, Jul 18, 2021 at 12:30:27PM +0800, Qi Zheng wrote:
>>>> The commit 63f3655f9501(mm, memcg: fix reclaim deadlock with writeback)
>>>> fix a deadlock bug by pre-allocating the pte page table outside of the
>>>> page lock, the commit f9ce0be71d1f(mm: Cleanup faultaround and
>>>> finish_fault() codepaths) rework the relevant code but ignore this race,
>>>> fix it.
>>>>
>>>> Fixes: f9ce0be71d1f(mm: Cleanup faultaround and finish_fault() codepaths)
>>>> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
>>>
>>> Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
>>>
>>> and add stable@, please.
>>>
>>
>> OK, I will add these in the patch v2, thanks.
> 
> Please send this as a separate standalone patch, not as a part of the
> main series.
> 
> Also, please include in the changelog a description of the user-visible
> impact of the bug which is being fixed.
> 

OK, I will do this.

Thanks,
Qi