linux-kernel - Re: [syzbot] [sound?] kernel BUG in filemap

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Message-ID: <80840307-942d-4e7b-849d-2ca9bb4bbefa@arm.com>
Date: Tue, 16 Sep 2025 13:50:08 +0100
From: Ryan Roberts <ryan.roberts@....com>
To: syzbot <syzbot+263f159eb37a1c4c67a4@...kaller.appspotmail.com>,
 akpm@...ux-foundation.org, chaitanyas.prakash@....com, davem@...emloft.net,
 david@...hat.com, edumazet@...gle.com, hdanton@...a.com, horms@...nel.org,
 jack@...e.cz, kuba@...nel.org, kuniyu@...gle.com,
 linux-kernel@...r.kernel.org, linux-sound@...r.kernel.org,
 netdev@...r.kernel.org, pabeni@...hat.com, perex@...ex.cz,
 syzkaller-bugs@...glegroups.com, tiwai@...e.com, willemb@...gle.com
Subject: Re: [syzbot] [sound?] kernel BUG in filemap_fault (2)

On 14/09/2025 11:51, syzbot wrote:
> syzbot suspects this issue was fixed by commit:
> 
> commit bdb86f6b87633cc020f8225ae09d336da7826724
> Author: Ryan Roberts <ryan.roberts@....com>
> Date:   Mon Jun 9 09:27:23 2025 +0000
> 
>     mm/readahead: honour new_order in page_cache_ra_order()

I'm not sure what original bug you are claiming this is fixing? Perhaps this?

https://lore.kernel.org/linux-mm/6852b77e.a70a0220.79d0a.0214.GAE@google.com/

If so, the fix for that was squashed into the original patch before it was
merged upstream. That is now Commit 38b0ece6d763 ("mm/filemap: allow arch to
request folio size for exec memory").

Thanks,
Ryan


> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1100b934580000
> start commit:   b4911fb0b060 Merge tag 'mmc-v6.16-rc1' of git://git.kernel..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3f6ddf055b5c86f8
> dashboard link: https://syzkaller.appspot.com/bug?extid=263f159eb37a1c4c67a4
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=157cf48c580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=146a948c580000
> 
> If the result looks correct, please mark the issue as fixed by replying with:
> 
> #syz fix: mm/readahead: honour new_order in page_cache_ra_order()
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection