最近在做mono 3.10针对socket性能方面的测试,在想对压力比较高的情况下发现了mono的一个bug会导致程序引发未知异常从而导致程序结束的严重问题.

错误信息

Unhandled Exception:System.InvalidOperationException: EndSend can only be called once perasynchronous operation  at System.Net.Sockets.Socket.EndSend (IAsyncResult asyncResult,System.Net.Sockets.SocketError& errorCode) [0x00000] in 
    
     :0   at System.Net.Sockets.Socket.EndSend (IAsyncResult result) [0x00000] in
     
      :0   at System.Net.Sockets.SocketAsyncEventArgs.SendCallback (IAsyncResult ares)[0x00000] in 
      
       :0   at System.Net.Sockets.SocketAsyncEventArgs.DispatcherCB (IAsyncResult ares)[0x00000] in 
       
        :0epoll(ADD): 9 Bad file descriptor
       
      
     
    

          从代码上来看是由Socket.EndSend引发的异常没有被处理,看样子是由epoll导面抛出的.SocketAsyncEventArgs.SendCallback的处理代码如下:

internal void SendCallback (IAsyncResult ares)		{			try {				BytesTransferred = curSocket.EndSend (ares);			} catch (SocketException se){				SocketError = se.SocketErrorCode;			} catch (ObjectDisposedException) {				SocketError = SocketError.OperationAborted;			} finally {				OnCompleted (this);			}		}