mod_perl and mod_hfs_apple don't play well together on OS X
If you’re doing local mod_perl development on Mac OS X and find that after Software Update runs that Apache is segfaulting on every request with an error like [Tue Mar 19 23:30:01 2013] [notice] child pid 43158 exit signal Segmentation fault (11), check your /etc/apache2/httpd.conf for a line like this: LoadModule hfs_apple_module libexec/apache2/mod_hfs_apple.so If it’s not commented out, do so. For whatever reason, mod_hfs_apple and mod_perl do not play nicely together.