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

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Message-ID: <000000000000accfd30606e6bcd0@google.com>
Date:   Wed, 04 Oct 2023 09:45:37 -0700
From:   syzbot <syzbot+b42fe626038981fb7bfa@...kaller.appspotmail.com>
To:     amir73il@...il.com, 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)

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