linux-kernel - Re: possible deadlock in mnt_want

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Date:   Sat, 07 Nov 2020 04:10:06 -0800
From:   syzbot <syzbot+ae82084b07d0297e566b@...kaller.appspotmail.com>
To:     amir73il@...il.com, ast@...nel.org, dvyukov@...gle.com,
        linux-fsdevel@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-unionfs@...r.kernel.org,
        miklos@...redi.hu, mszeredi@...hat.com, rgoldwyn@...e.de,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk,
        zohar@...ux.ibm.com, zohar@...ux.vnet.ibm.com
Subject: Re: possible deadlock in mnt_want_write

syzbot suspects this issue was fixed by commit:

commit 146d62e5a5867fbf84490d82455718bfb10fe824
Author: Amir Goldstein <amir73il@...il.com>
Date:   Thu Apr 18 14:42:08 2019 +0000

    ovl: detect overlapping layers

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11e40184500000
start commit:   6d906f99 Merge tag 'arm64-fixes' of git://git.kernel.org/p..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=856fc6d0fbbeede9
dashboard link: https://syzkaller.appspot.com/bug?extid=ae82084b07d0297e566b
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=111767b7200000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1611ab2d200000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: ovl: detect overlapping layers

For information about bisection process see: https://goo.gl/tpsmEJ#bisection