It's pretty stock RHEL7 running Server version: Apache/2.4.6 (). It appears that running Apache2::Module::add(__PACKAGE__, \@directives); is what triggers it. Other methods from that module are fine. Like: 
 # test if an Apache module is loaded
         if (Apache2::Module::loaded('mod_perl.c')) {
             warn "mod_perl!";
         }

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This is loading in a metric bumload of mod_perl 1.x code which I've brought up to date. Allegedly. I guess I ought to try the example from that page *without* all the legacy.

Edit: I've taken out all the other code and all I'm trying to do now it load the module to add a directive to httpd.conf. The code in https://github.com/omnigroup/Apache/blob/master/httpd/server/config.c is: 
      /*
         * If this fails some module forgot to call ap_reserve_module_
+slots*.
         */
        ap_assert(total_modules < conf_vector_length);

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In reply to Re^2: Trying to use Apache2::Module throws an Apache exception by davehodg
in thread Trying to use Apache2::Module throws an Apache exception by davehodg

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