C# 4.0 Ping BSOD

NetMapper.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.NetworkInformation;
using System.Text;
using System.Threading;

namespace NetMapper
{
    class Program
    {
        static void Main(string[] args)
        {   
            //giving it a large amount of ips to scan and setting the timeout to 1000ms will produce the BSOD
            //BSOD message will be PROCESS_HAS_LOCKED_PAGES
            string network = "10.0.*.*";
            var validHosts = FindValidHosts(network, 100);
            Console.WriteLine("----------------");
            foreach(string ip in validHosts)
            {
                Console.WriteLine(ip);
            }
            Console.WriteLine("Done");
            Console.ReadLine();
        }
        static List<string> FindValidHosts(string ipRange,int numThreads)
        {
            var ips = GenerateIPs(ipRange);
            int neededPings = ips.Count;
            int startedPings = 0;
            PingReplyTracker replyTracker = new PingReplyTracker();
            while(replyTracker.FinishedCalls != neededPings && startedPings < neededPings)
            {
                int runningCalls = startedPings - replyTracker.FinishedCalls;
                int availableCalls = numThreads - runningCalls;
                for(int i = 0;i < availableCalls;i++)
                {
                    AsyncPing(ips[startedPings], ref replyTracker);
                    startedPings++;
                    if (startedPings >= neededPings)
                        break;
                }
                Thread.Sleep(100);
            }
            return replyTracker.ValidIps;
        }
        static List<string> GenerateIPs(string iprange)
        {
            List<string> ips = new List<string>();
            string[] foundOctets = iprange.Split(new string[] {"."}, StringSplitOptions.RemoveEmptyEntries);
            string[] octets = new string[4];
            if (foundOctets.Length == 4 && !foundOctets.Contains("*"))
            {
                //we were given a valid ip
                return new List<string>() {iprange};
            }
            for(int i = 0;i < 4;i++)
            {
                if (i >= foundOctets.Length)
                    octets[i] = "*";
                else
                    octets[i] = foundOctets[i];
            }
            StringBuilder ipMask = new StringBuilder();
            for(int i = 0;i < octets.Length;i++)
            {
                if (octets[i] == "*")
                {
                    //loop from 1 to 254
                    for (int octet = 1; octet <= 254; octet++)
                    {
                        ips.AddRange(GenerateIPs(ipMask.ToString() + "." + octet));
                    }
                    break;
                }
                else
                {
                    if (ipMask.Length != 0)
                        ipMask.Append(".");
                    ipMask.Append(octets[i]);
                }
            }
            return ips;
        }
        private static byte[] pingBuffer = Encoding.ASCII.GetBytes("PING");
        static void AsyncPing(string ip,ref PingReplyTracker pingReplyTracker)
        {
            Ping ping = new Ping();
            ping.PingCompleted += new PingCompletedEventHandler(ping_PingCompleted);
            ping.SendAsync(ip, 1000, pingBuffer, pingReplyTracker);

        }

        static void ping_PingCompleted(object sender, PingCompletedEventArgs e)
        {
            PingReplyTracker pingReplyTracker = (PingReplyTracker) e.UserState;
            pingReplyTracker.FinishedCall();
            if (e.Reply.Status == IPStatus.Success)
                pingReplyTracker.AddValidIp(e.Reply.Address.ToString());
        }
    }
    class PingReplyTracker
    {
        public int FinishedCalls;
        public List<string> ValidIps = new List<string>(); 
        public void FinishedCall()
        {
            FinishedCalls++;
        }
        public void AddValidIp(string ip)
        {
            ValidIps.Add(ip);
            Console.WriteLine(ip);
        }
    }
}