mod_security 2.7.3
apache 2.4.4

Trying to get some SlowHTTP defenses up and running using mod_security but SecReadStateLimit is giving me a hard time. It reports
  ModSecurity: Access denied with code 400. Too many threads [1024] of 15 allowed in READ state from - Possible DoS Consumption Attack
even though the only connection existing is my access of mod_status. I cannot see those 1024 threads it keeps on complaining about using ps.

Is that behaviour known of ?