Re: INFO: rcu detected stall in sys_clock_settime

syzbot has bisected this issue to:

commit 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22
Author: Vinicius Costa Gomes [off-list ref]
Date:   Sat Sep 29 00:59:43 2018 +0000

    tc: Add support for configuring the taprio scheduler

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=167142f0900000
start commit:   e9919e11 Merge branch 'for-linus' of git://git.kernel.org/..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=157142f0900000
console output: https://syzkaller.appspot.com/x/log.txt?x=117142f0900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a160d1053fc89af5
dashboard link: https://syzkaller.appspot.com/bug?extid=f3bd350a4124f10acdae
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1353c420900000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=130f8ef7100000

Reported-by: syzbot+f3bd350a4124f10acdae@syzkaller.appspotmail.com
Fixes: 5a781ccbd19e ("tc: Add support for configuring the taprio scheduler")

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