In Bug ? Perl dumps core on reference to @_ ?, I had a ?similar? problem which I could only produce on IndigoPerl 5.6.1, not, for example, on perl 5.5.3 under Linux. We (that is, TheDamian) ascribed it to some strange/too early memory cleanup and I was too lazy to submit this as a bug. Maybe you could try to track down the problems with your code and/or reduce it to something similar to what I did, ultimately reducing the problematic case down to some stringification case (see Re: Re: Bug ? Perl dumps core on reference to @_ ? (Stringify bug ??)).

perl -MHTTP::Daemon -MHTTP::Response -MLWP::Simple -e ' ;    # The  
$d = new HTTP::Daemon and fork and getprint $d->url and exit;#spider
($c = $d->accept())->get_request(); $c->send_response( new   #in the
HTTP::Response(200,$_,$_,qq(Just another Perl hacker\n))); ' #  web
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