Hi there, I recently found this message in my error_log which got my httpd stopped working and left pid file behind.
The httpd is 2.4.7 on CentOS 6.4 using rpmbuild. "[mpm_event:notice] [pid 7185:tid 139687436580608] AH00493: SIGUSR1 received. Doing graceful restart httpd: Syntax error on line 33 of /etc/httpd/conf/httpd.conf: Cannot load lib64/httpd/modules/mod_proxy_fcgi.so into server: /usr/lib64/httpd/modules/mod_proxy_fcgi.so: undefined symbol: ap_fcgi_encoded_env_len" After the incident, I tried "service httpd status", it told me that httpd is dead but pid file exists. Restarting httpd makes it back online, but I want to know why it happened? Thanks.
