linux-kernel - Re: gcc-8: mm/swapfile.c:863:40: error: array subscript 1 is above array bounds of 'struct list

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Message-ID: <CAMgjq7Bz0DY+rY0XgCoH7-Q=uHLdo3omi8kUr4ePDweNyofsbQ@mail.gmail.com>
Date: Mon, 19 Aug 2024 19:44:25 +0800
From: Kairui Song <ryncsn@...il.com>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: Chris Li <chrisl@...nel.org>, linux-mm <linux-mm@...ck.org>, 
	open list <linux-kernel@...r.kernel.org>, lkft-triage@...ts.linaro.org, 
	Linux Regressions <regressions@...ts.linux.dev>, Barry Song <21cnbao@...il.com>, 
	"Huang, Ying" <ying.huang@...el.com>, Hugh Dickins <hughd@...gle.com>, 
	Kalesh Singh <kaleshsingh@...gle.com>, Ryan Roberts <ryan.roberts@....com>, 
	Andrew Morton <akpm@...ux-foundation.org>, Anders Roxell <anders.roxell@...aro.org>
Subject: Re: gcc-8: mm/swapfile.c:863:40: error: array subscript 1 is above
 array bounds of 'struct list_head[1]' [-Werror=array-bounds]

On Mon, Aug 19, 2024 at 6:16 PM Naresh Kamboju
<naresh.kamboju@...aro.org> wrote:
>
> On Mon, 19 Aug 2024 at 13:58, Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
> >
> > The x86 builds failed with gcc-8 due to following build warnings / errors on
> > Linux next-20240802 to next-20240819.
> >
> > x86_64 defconfig gcc-8 build failed
> > x86_64 defconfig gcc-13 build pass
> >
> > First seen on the next-20240802 tag.
> >
> >   GOOD: next-20240730
> >   BAD:  next-20240802
>
> Anders bisected this and found the first bad commit id as,
> aded4352f648 ("mm: swap: separate SSD allocation from
> scan_swap_map_slots()") first faulty one
>
> - Naresh
>

Hi Naresh,

Thanks for the report, the problem will occur when CONFIG_THP_SWAP is
disabled. Can you try the following patch? I can confirm it's fixed
with my test.

Download attachment "0001-mm-swap-fix-array-bounds-error-with-CONFIG_THP_SWAP-.patch" of type "application/octet-stream" (880 bytes)