使用读取int32时，长度标头突然出现错误值？

我写了一个TCP监听器接收来自单个客户端的图像序列，这是服务器的代码：它接收帧很好使用读取int32时，长度标头突然出现错误值？

new Thread(() => 
{ 
    while (true) 
    { 
    displayingFrame.Start(); // another thread to display images 
    Socket socket = listener.AcceptSocket(); 
    TcpClient client = new TcpClient(); 
    client.Client = socket; 
    Debug.WriteLine("Connection accepted."); 

    var childSocketThread = new Thread(() => 
    { 
     NetworkStream ns = client.GetStream(); 
     BinaryReader br = new BinaryReader(ns); 

     while (true) 
     { 
     using (MemoryStream ms = new MemoryStream()) 
     { 
      int length = br.ReadInt32(); 

      Debug.WriteLine("length : " + length); 

      byte[] buf = new byte[1024]; 
      int totalReaded = 0; 
      int readed = 0; 
      while (totalReaded < length) 
      { 
       readed = br.Read(buf, 0, buf.Length); 
       ms.Write(buf, 0, readed); 
       totalReaded += readed; 
      } 

      byte[] frame = ms.ToArray(); 
      this.frames.Enqueue(frame); 
      Debug.WriteLine("frame enqueued with length " + frame.Length); 

     } 
     } 
    }); 
    childSocketThread.Start(); 
    } 
}).Start();

却突然br.ReadInt32();返回一个非常大的长度，以便br.Read(buf, 0, buf.Length);需要很长的实时写入内存流，并在帧内写入错误的数据。

这是客户端：

TcpClient client = new TcpClient(); 
client.Connect(new IPEndPoint(IPAddress.Loopback, 20000)); 
NetworkStream ns = client.GetStream(); 
BinaryWriter bw = new BinaryWriter(ns); 
while (true) 
{ 
    byte[] frame = Screenshot(); 

    bw.Write(frame.Length); 
    Console.WriteLine("a frame length has flushed : " + frame.Length); 

    bw.Write(frame); 
    Console.WriteLine("a frame itself has flushed"); 
} 

Console.ReadKey();

，这里的调试信息：