Re: INFO: rcu detected stall in iterate_cleanup_work (2)

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=141ed087100000
start commit:   cd77006e Merge tag 'hyperv-fixes-signed' of git://git.kern..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=121ed087100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7be693511b29b338
dashboard link: https://syzkaller.appspot.com/bug?extid=cc8495ea4052b9b79b72
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12e567e5100000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=126ffccd100000

Reported-by: syzbot+cc8495ea4052b9b79b72@syzkaller.appspotmail.com
Fixes: 5a781ccbd19e ("tc: Add support for configuring the taprio scheduler")

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