CPU Usage over 70%, hundreds of processes that are not completing

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http://forums.cpanel.net – I'm not sure how to diagnose this problem and was hoping someone could point me in the right direction. I have a website in code igniter that has hundreds of processes running and is tanking my cpu usage. If I restart mysql all the processes die and then CPU goes back to 2% usage, wait 3 days and it's back to 70%+ usage. In htop I see hundreds of processes like this: 7377 username 15 0 98064 11604 5920 S 0.0 0.3 1:02.78 /usr/bin/php /home/username/public_html/index.php All referencing the same file and same username. pstack on any of them gives me the same thing: #0 (HowTos)