Re: [PATCH 1/7] mm: fix the deadlock in finish_fault()

[Andrew Morton]

On Mon, 19 Jul 2021 17:53:12 +0800 Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx>
> > 
> > Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> > 
> > 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.