Re: BUG: soft lockup in smp_call_function

[syzbot]

syzbot has bisected this issue to:

commit 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22
Author: Vinicius Costa Gomes <vinicius.gomes@xxxxxxxxx>
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=1196d06f100000
start commit:   4437dd6e Merge tag 'io_uring-5.8-2020-07-12' of git://git...
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1396d06f100000
console output: https://syzkaller.appspot.com/x/log.txt?x=1596d06f100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=66ad203c2bb6d8b
dashboard link: https://syzkaller.appspot.com/bug?extid=cce3691658bef1b12ac9
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11a160bf100000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16d2bd77100000

Reported-by: syzbot+cce3691658bef1b12ac9@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 5a781ccbd19e ("tc: Add support for configuring the taprio scheduler")

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