What could be causing this?

Your code :) For some reason it keeps getting reloaded, and/or it keeps re-importing Apache constants ( odd choice for someone using ModPerl::PerlRun )

Fix your code, follow CGI to mod_perl Porting. mod_perl Coding guidelines

Well I have pinpointed the problem. It's a problem with LWP::UserAgent and LWP::Simple.

Here is a some sample code. It acts as a post proxy. Every time this is ran I get 50 or so error messages as above.

    use LWP::UserAgent;
    my $ua = LWP::UserAgent->new;
    $ua->agent("send");

    # Create a request
    my $req = HTTP::Request->new(POST => 'http://signup.website.com/in
+dex.pl?action=signup');
    $req->content_type('application/x-www-form-urlencoded');
  
    use URI::Escape;
    
    my $username = uri_escape($CGI->param('username'));
    my $email = uri_escape($CGI->param('email'));
    my $password = uri_escape($CGI->param('password'));
    my $name = uri_escape($CGI->param('name'));
    my $recaptcha_response_field = uri_escape($CGI->param('recaptcha_r
+esponse_field'));
    my $recaptcha_challenge_field = uri_escape($CGI->param('recaptcha_
+challenge_field'));
    my $affiliate_key = uri_escape($CGI->param('affiliate_key'));
    
      $req->content("username=$username&email=$email&password=$passwor
+d&name=$name&recaptcha_response_field=$recaptcha_response_field&recap
+tcha_challenge_field=$recaptcha_challenge_field&affiliate_key=$affili
+ate_key&sitetype=clan");

      # Pass request to the user agent and get a response back
      my $res = $ua->request($req);

    # Check the outcome of the response
    print $CGI->header(-type => "text/html");
    if ($res->is_success) {
        print $res->content;
    }else {
      print $res->status_line, "\n";
  }
[download]