Re: The number of ways I've independently discovered to make Perl segfault:

[shenme]

I need to change my answer, to one.   Perl v5.6.1 for i386-linux using modules CGI, CGI::Application, CGI::FormBuilder, CGI::Session, and (depressing the dromedary's dome) Storable, as in

  $session = CGI::Session->new( 'driver:File;serializer:Storable', 
                                $q, {Directory=>'/tmp'} );

But throwing in a gratuitous $session->close() cured all that.   Sigh....