linux-kernel - Re: [syzbot] [reiserfs?] [squashfs?] BUG: Dentry still in use in unmount

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Date: Sun, 17 Dec 2023 11:16:09 +0200
From: Amir Goldstein <amir73il@...il.com>
To: syzbot <syzbot+8608bb4553edb8c78f41@...kaller.appspotmail.com>
Cc: chao@...nel.org, jaegeuk@...nel.org, 
	linux-f2fs-devel@...ts.sourceforge.net, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, phillip@...ashfs.org.uk, 
	reiserfs-devel@...r.kernel.org, squashfs-devel@...ts.sourceforge.net, 
	syzkaller-bugs@...glegroups.com, terrelln@...com, viro@...iv.linux.org.uk
Subject: Re: [syzbot] [reiserfs?] [squashfs?] BUG: Dentry still in use in unmount

On Sun, Dec 17, 2023 at 1:19 AM syzbot
<syzbot+8608bb4553edb8c78f41@...kaller.appspotmail.com> wrote:
>
> syzbot has bisected this issue to:
>
> commit c63e56a4a6523fcb1358e1878607d77a40b534bb
> Author: Amir Goldstein <amir73il@...il.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=13723c01e80000
> 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=10f23c01e80000
> console output: https://syzkaller.appspot.com/x/log.txt?x=17723c01e80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=53ec3da1d259132f
> dashboard link: https://syzkaller.appspot.com/bug?extid=8608bb4553edb8c78f41
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17b8b6e1e80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16ec773ae80000
>
> Reported-by: syzbot+8608bb4553edb8c78f41@...kaller.appspotmail.com
> Fixes: c63e56a4a652 ("ovl: do not open/llseek lower file with upper sb_writers held")
>

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