Re: WARNING in kfree

[syzbot]

syzbot has bisected this bug to:

commit 3deadeebafcec6a0a7c9397bd32ea5ac6d5191c1
Author: David Howells <dhowells@xxxxxxxxxx>
Date:   Mon Jan 21 14:04:22 2019 +0000

    vfs: Convert debugfs to use the new mount API

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=115d9e56600000
start commit:   ed2393ca Add linux-next specific files for 20190827
git tree:       linux-next
final crash:    https://syzkaller.appspot.com/x/report.txt?x=135d9e56600000
console output: https://syzkaller.appspot.com/x/log.txt?x=155d9e56600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2ef5940a07ed45f4
dashboard link: https://syzkaller.appspot.com/bug?extid=5aca688dac0796c56129
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1595ee12600000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16df7fd2600000

Reported-by: syzbot+5aca688dac0796c56129@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 3deadeebafce ("vfs: Convert debugfs to use the new mount API")

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