I am not saying the problem is identical. I am saying I suspect it has
a similar root cause.
My suggestions are to (a) switch off of using mod_perl for some other
deployment technique, or (b) temporarily remove sections of your
RT_SiteConfig until it no longer crashes (as a means of determining
what is the trigger). My suspicion is that you’re using ExternalAuth
talking to LDAP using TLS, or somesuch.