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

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Date:   Tue, 20 Jul 2021 16:14:21 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Qi Zheng <zhengqi.arch@...edance.com>
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 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.