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Message-ID: <3cb9b024-d124-b13d-a80e-f5788b023065@linux.alibaba.com>
Date:   Sun, 2 Apr 2023 22:56:27 +0800
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH] mm/swap: fix swap_info_struct race between swapoff and
 get_swap_pages()
To:     Bagas Sanjaya <bagasdotme@gmail.com>, akpm@linux-foundation.org
Cc:     linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        linux-stable@vger.kernel.org
References: <20230401221920.57986-1-rongwei.wang@linux.alibaba.com>
 <ZCmFExoOsho9pt+Q@debian.me>
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From:   Rongwei Wang <rongwei.wang@linux.alibaba.com>
In-Reply-To: <ZCmFExoOsho9pt+Q@debian.me>
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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@vger.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/
>