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From: Amir Goldstein <amir73il@gmail.com>
Date: Sun, 17 Dec 2023 11:16:09 +0200
Message-ID: <CAOQ4uxjjo=qwwWcRXhv_D+KFfnPa_CEOrPbbZtzLroiOO7eYDg@mail.gmail.com>
Subject: Re: [syzbot] [reiserfs?] [squashfs?] BUG: Dentry still in use in unmount
To: syzbot <syzbot+8608bb4553edb8c78f41@syzkaller.appspotmail.com>
Cc: chao@kernel.org, jaegeuk@kernel.org, 
	linux-f2fs-devel@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, 
	linux-kernel@vger.kernel.org, phillip@squashfs.org.uk, 
	reiserfs-devel@vger.kernel.org, squashfs-devel@lists.sourceforge.net, 
	syzkaller-bugs@googlegroups.com, terrelln@fb.com, viro@zeniv.linux.org.uk
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On Sun, Dec 17, 2023 at 1:19=E2=80=AFAM syzbot
<syzbot+8608bb4553edb8c78f41@syzkaller.appspotmail.com> wrote:
>
> syzbot has bisected this issue to:
>
> commit c63e56a4a6523fcb1358e1878607d77a40b534bb
> Author: Amir Goldstein <amir73il@gmail.com>
> Date:   Wed Aug 16 09:42:18 2023 +0000
>
>     ovl: do not open/llseek lower file with upper sb_writers held
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=3D13723c01e8=
0000
> start commit:   3bd7d7488169 Merge tag 'io_uring-6.7-2023-12-15' of git:/=
/..
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=3D10f23c01e8=
0000
> console output: https://syzkaller.appspot.com/x/log.txt?x=3D17723c01e8000=
0
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3D53ec3da1d2591=
32f
> dashboard link: https://syzkaller.appspot.com/bug?extid=3D8608bb4553edb8c=
78f41
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=3D17b8b6e1e80=
000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=3D16ec773ae8000=
0
>
> Reported-by: syzbot+8608bb4553edb8c78f41@syzkaller.appspotmail.com
> Fixes: c63e56a4a652 ("ovl: do not open/llseek lower file with upper sb_wr=
iters held")
>

#syz test: https://github.com/amir73il/linux ovl-fixes