We also see this in the logs:
Apr 1 19:51:36 local/s0-bigip-lb1 err httpd[6558]: [error] [client 10.7.241.216] FastCGI: incomplete headers (0 bytes) received from server "/usr/local/www/iControl/iControlPortal.cgi"
Apr 1 19:51:36 local/s0-bigip-lb1 warning fcgi-[6509]: [warn] FastCGI: server "/usr/local/www/iControl/iControlPortal.cgi" (pid 6513) terminated due to uncaught signal '11' (Segmentation fault)
Apr 1 19:51:36 local/s0-bigip-lb1 warning fcgi-[6509]: [warn] FastCGI: server "/usr/local/www/iControl/iControlPortal.cgi" restarted (pid 6771)