I quickly tested with and without ‘no option http-use-htx’ and saw 100% utilization with both. Reverting to 1.6 immediately fixed the issue. For the simplified version I am using no threading, although code changes may have been necessary to support threading this impacts both threading and no threading.
If there is anything else you need me to try please let me know. It’s very easy to reproduce. I am really quite surprised that everyone else doesn’t have this problem… other than volume of traffic I am not sure what I am doing differently.