linux-kernel - Re: [syzbot] [integrity] [overlayfs] possible deadlock in mnt_want

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Date:   Thu, 5 Oct 2023 12:36:04 +0300
From:   Amir Goldstein <amir73il@...il.com>
To:     syzbot <syzbot+b42fe626038981fb7bfa@...kaller.appspotmail.com>
Cc:     hdanton@...a.com, linux-fsdevel@...r.kernel.org,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-unionfs@...r.kernel.org,
        miklos@...redi.hu, mszeredi@...hat.com,
        syzbot@...kalhler.appspotmail.com, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk, zohar@...ux.ibm.com, zohar@...ibm.com
Subject: Re: [syzbot] [integrity] [overlayfs] possible deadlock in
 mnt_want_write (2)

On Wed, Oct 4, 2023 at 7:45 PM syzbot
<syzbot+b42fe626038981fb7bfa@...kaller.appspotmail.com> wrote:
>
> syzbot has bisected this issue to:
>
> commit 708fa01597fa002599756bf56a96d0de1677375c
> Author: Miklos Szeredi <mszeredi@...hat.com>
> Date:   Mon Apr 12 10:00:37 2021 +0000
>
>     ovl: allow upperdir inside lowerdir
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17ad11b2680000
> start commit:   3aba70aed91f Merge tag 'gpio-fixes-for-v6.6-rc3' of git://..
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=146d11b2680000
> console output: https://syzkaller.appspot.com/x/log.txt?x=106d11b2680000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=e4ca82a1bedd37e4
> dashboard link: https://syzkaller.appspot.com/bug?extid=b42fe626038981fb7bfa
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1304fba6680000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13cec0dc680000
>
> Reported-by: syzbot+b42fe626038981fb7bfa@...kaller.appspotmail.com
> Fixes: 708fa01597fa ("ovl: allow upperdir inside lowerdir")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

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