linux-kernel - Re: [PATCH] mm/swap: fix swap_info_struct race between swapoff and get_swap

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Date:   Sun, 2 Apr 2023 22:56:27 +0800
From:   Rongwei Wang <rongwei.wang@...ux.alibaba.com>
To:     Bagas Sanjaya <bagasdotme@...il.com>, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-stable@...r.kernel.org
Subject: Re: [PATCH] mm/swap: fix swap_info_struct race between swapoff and
 get_swap_pages()


On 4/2/23 9:37 PM, Bagas Sanjaya wrote:
> On Sun, Apr 02, 2023 at 06:19:20AM +0800, Rongwei Wang wrote:
>> Without this modification, a core will wait (mostly)
> "Currently, a core will ..."
>
>> But, a worse consequence, panic also can be caused by
> "However, in the worst case, ..."
>
>> In this patch, we lock p->lock before calling
> "Lock p->lock before calling ..."
>
>> We also find this problem exists in stable 5.10.
> So, you claim that 5.15.y and 6.1.y aren't affected, right?

I think above both versions also be affected. I can check they next.

>
> Also, Cc: stable@...r.kernel.org on the SoB area (as pointed by kernel
> test robot [1].
Thanks, next version will to do.
>
> Thanks.
>
> [1]: https://lore.kernel.org/stable/ZCiuGEkyk%2F1Afisk@ec83ac1404bb/
>