Re: WARNING in untrack_pfn

[syzbot]

syzbot has bisected this bug to:

commit c68729119f4d2993bec3c9cb999ad76de5aeddba
Author: Julia Lawall <Julia.Lawall@xxxxxxx>
Date:   Sat Jul 15 09:58:19 2017 +0000

    leds: tlc591xx: add missing of_node_put

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12cda0f3200000
start commit:   23203e3f Merge branch 'akpm' (patches from Andrew)
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=11cda0f3200000
console output: https://syzkaller.appspot.com/x/log.txt?x=16cda0f3200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=861a3573f4e78ba1
dashboard link: https://syzkaller.appspot.com/bug?extid=e1a4f80c370d2381e49f
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17836d15400000

Reported-by: syzbot+e1a4f80c370d2381e49f@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: c68729119f4d ("leds: tlc591xx: add missing of_node_put")

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