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=11535418580000
start commit:   7ed2d9158877 qed: fix possible uninit pointer read in qed_..
git tree:       net
final oops:     https://syzkaller.appspot.com/x/report.txt?x=13535418580000
console output: https://syzkaller.appspot.com/x/log.txt?x=15535418580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fee25f93665c89ac
dashboard link: https://syzkaller.appspot.com/bug?extid=b0ae8f1abf7d891e0426
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=112374f8580000

Reported-by: syzbot+b0ae8f1abf7d891e0426@syzkaller.appspotmail.com
Fixes: 5a781ccbd19e ("tc: Add support for configuring the taprio scheduler")

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