linux-ext4 - Re: [syzbot] [ext4?] kernel BUG in ext4_enable

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Date: Mon, 12 Feb 2024 14:23:50 +0100
From: Jan Kara <jack@...e.cz>
To: syzbot <syzbot+693985588d7a5e439483@...kaller.appspotmail.com>
Cc: adilger.kernel@...ger.ca, axboe@...nel.dk, brauner@...nel.org,
	jack@...e.cz, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev, nathan@...nel.org, ndesaulniers@...gle.com,
	syzkaller-bugs@...glegroups.com, trix@...hat.com, tytso@....edu
Subject: Re: [syzbot] [ext4?] kernel BUG in ext4_enable_quotas

On Sat 10-02-24 06:59:05, syzbot wrote:
> syzbot suspects this issue was fixed by commit:
> 
> commit 6f861765464f43a71462d52026fbddfc858239a5
> Author: Jan Kara <jack@...e.cz>
> Date:   Wed Nov 1 17:43:10 2023 +0000
> 
>     fs: Block writes to mounted block devices
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=147e5b20180000
> start commit:   89bf6209cad6 Merge tag 'devicetree-fixes-for-6.5-2' of git..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=1b32f62c755c3a9c
> dashboard link: https://syzkaller.appspot.com/bug?extid=693985588d7a5e439483
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11ba1fefa80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1636640fa80000
> 
> If the result looks correct, please mark the issue as fixed by replying with:
 
The syzbot reproducer seems to mess with multiple ext4 mounts stacked on
one another and the loop device as well. Quite likely it managed to corrupt
the mounted filesystem. So:

#syz fix: fs: Block writes to mounted block devices

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR