I've just installed beta3b to my 88U. When I go to page QoS Statistics I think httpd crashes because I can't access to any page on web UI till restart httpd service.
and now cpu is %100 and for a while and here is htop output which seems weird to me.
https://prnt.sc/ft2r02
I've chosen "WAN packet overhead" as cable(DOCSIS) which I use. but after apllying this it still shows "Select Preset:"
CPU is %100 for about 10 minutes maybe more and router uptime is 13 minutes already. I will reboot it now.
Your router is getting stuck trying to run a bunch of "tc class change" calls. Sounds like the fq_codel patch is getting stuck in an endless loop. Are these from a custom script?