Okay, so I have pruned my original script to a very simplistic one that is completely straightforward. It along with the input file example are below. It is just reading in data, splitting, and storing it into a hash. At some moment (around where there are 8 million records in the hash, i get a seg fault. I've reordered data and it produces different results. By this I mean it won't break on one specific line. It seems to have to do with volume. Also, if I reorder the key vectors of the hash, it will work. If I delete the last one, it will work. I am not at a point where I don't know where to turn. Any help would be GREATLY appreciated. 
----

#!/usr/bin/perl -w -Iperl
use strict;
                                                                      
+                                                                     
+                  
$| = 1;
                                                                      
+                                                                     
+                  
my $globalCounter = 0;
my %mon_log;
                                                                      
+                                                                     
+                  
my $month = "03";
my $year = "2004";                                                    
+                                                                     
+                               
                                                                      
+                                                                     
+                  
  open(REPORTFILE, "inputfile") or die "$0:  Can't open data file : $!
+\n"; # open file
                                                                      
+                                                                     
+                  
  open(DEBUGFILE, "> debug") or die "$0:  Can't open debug file : $!\n
+"; # open file
                                                                      
+                                                                     
+                  
  while(<REPORTFILE>){
                                                                      
+                                                                     
+                  
    my($fmt_proto, $fmt_dest_ip, $fmt_src_ip, $fmt_dest_port, $fmt_src
+_port, $fmt_drp_packets, $fmt_country) = split(/\s+/);
                                                                      
+                                                                     
+                  
    print DEBUGFILE "{$month.$year}{$fmt_proto}{$fmt_dest_ip}{$fmt_des
+t_port}{$fmt_src_ip}{$fmt_src_port}\n";
                                                                      
+                                                                     
+                  
    if(!exists($mon_log{$month.$year}{$fmt_proto}{$fmt_dest_ip}{$fmt_d
+est_port}{$fmt_src_ip}{$fmt_src_port})){
      $globalCounter += 1;
      print DEBUGFILE $globalCounter,"\n";
    }
                                                                      
+                                                                     
+                  
    $mon_log{$month.$year}{$fmt_proto}{$fmt_dest_ip}{$fmt_dest_port}{$
+fmt_src_ip}{$fmt_src_port} += $fmt_drp_packets;
  }
                                                                      
+                                                                     
+                  
  close(REPORTFILE);
  close(DEBUGFILE);
  exit(0);
---

input file format:

icmp       123.45.67.89       123.76.243.210     0          11        
+  1                 United States
icmp       142.156.23.54      12.254.215.10      0          11        
+  1                 United States

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In reply to puzzling seg fault by ttown1079

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