[Tue Apr 30 08:34:21.227311 2019] [cgid:error] [pid 90210:tid 86753098675309] [client url:port] End of script output before headers: index.cgi

$ sudo ls -Alh /var/www/bugzilla/index.cgi
-rwxr-x--- 1 root www-data 2.2K May 12  2016 /var/www/bugzilla/index.cgi

# perl /var/www/bugzilla/checksetup.pl
Segmentation fault (core dumped)