Re: WARNING in kernfs_get

[syzbot]

syzbot has bisected this bug to:

commit 726e41097920a73e4c7c33385dcc0debb1281e18
Author: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Date:   Tue Jul 10 00:29:10 2018 +0000

    drivers: core: Remove glue dirs from sysfs earlier

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17a101cee00000
start commit:   9a568276 Merge branch 'x86-urgent-for-linus' of git://git...
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=146101cee00000
console output: https://syzkaller.appspot.com/x/log.txt?x=106101cee00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8f59875069d721b6
dashboard link: https://syzkaller.appspot.com/bug?extid=3dcb532381f98c86aeb1
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12657f0a400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=117728ae400000

Reported-by: syzbot+3dcb532381f98c86aeb1@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 726e41097920 ("drivers: core: Remove glue dirs from sysfs earlier")

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