[CentOS] httpd stopped working under SELinux so I had to turn SELinux off. libxml2.so.2: failed to map segment from shared object: Permission denied

> CentOS 5.4 64-bit with SELinux, happily running for over a year, suddenly
> httpd fails to start up, getting an error message like:
> 
> Starting httpd: Syntax error on line X of /etc/httpd/conf.d/php.conf:
> Cannot load /etc/httpd/modules/libphp5.so into server: libxml2.so.2:
> failed to map segment from shared object: Permission denied
> 
> I turned off SELinux and was able to start httpd.
> 
> But what went wrong?  And how to fix it and turn SELinux back on?
> 
> SElinux labels on libxml.so.2.6.26 are OK ( system_u:object_r:lib_t )
> and "restorecon -n libxml.so.2.6.26" does not return anything.
> 
> No recent AVC denied entries in /var/log/audit/audit.log or /var/log/messages.

Try to turn off the dontaudit rules for domains
that are in the base policy:

semodule -b /usr/share/selinux/targeted/enableaudit.pp

Then you might see the denials in the logs and fix the problem
in your local policy.

HTH