linux-kernel - Re: [syzbot] [xfs?] WARNING in xfs_bmapi_convert

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Message-ID: <20240207221850.hrqrnra4bkgjsqbg@quack3>
Date: Wed, 7 Feb 2024 23:18:50 +0100
From: Jan Kara <jack@...e.cz>
To: Dave Chinner <david@...morbit.com>
Cc: syzbot <syzbot+53b443b5c64221ee8bad@...kaller.appspotmail.com>,
	axboe@...nel.dk, brauner@...nel.org, chandan.babu@...cle.com,
	dchinner@...hat.com, djwong@...nel.org, jack@...e.cz,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-xfs@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [xfs?] WARNING in xfs_bmapi_convert_delalloc

On Thu 08-02-24 08:17:24, Dave Chinner wrote:
> On Tue, Feb 06, 2024 at 10:02:05PM -0800, 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=12b0ad7be80000
> > start commit:   e8c127b05766 Merge tag 'net-6.6-rc6' of git://git.kernel.o..
> > git tree:       upstream
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=11e478e28144788c
> > dashboard link: https://syzkaller.appspot.com/bug?extid=53b443b5c64221ee8bad
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14a6f291680000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=116bc355680000
> > 
> > If the result looks correct, please mark the issue as fixed by replying with:
> > 
> > #syz fix: fs: Block writes to mounted block devices
> 
> For real? The test doesn't even open a mounted block device for
> writes...

I was also confused by this. Somehow this commit makes the reproducer stop
working but I have no idea how that's possible.

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