To be honest, I have no idea. Here's the mention on AxKit:

There are currently some incompatibilities between the versions of expat loaded by Apache when compiled with RULE_EXPAT=yes (which is a default, unfortunately), and XML::Parser's copy of expat. This can cause sporadic segmentation faults in Apache's httpd processes. The solution is to recompile Apache with RULE_EXPAT=no (later Apache's have implemented this as --disable-rule=expat). If you have a recent mod_perl and use mod_perl's Makefile.PL DO_HTTPD=1 to compile Apache for you, this option will be enabled automatically for you.

In reply to Re^2: mod_perl go boom, mod_cgi works by jk2addict
in thread mod_perl go boom, mod_cgi works by hacker

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