The new 4.19 kernel is causing trouble

A "kworker" process is hogging my CPU. I have to go back to 4.18 kernel to resolve this issue.

UPDATE (01/24/2019)

The solution is amazingly simple. Follow this post:

1. Install perf;
2. sudo perf record -g -a sleep 10
3. sudo perf report

Scrolling down the records, it looks like the problem is related to my USB hub. Unplug the hub and the problem goes away.