Log exception when setting state to Failed.

Author: bgrainger

src/MySqlConnector/Core/ServerSession.cs

@@ -995,7 +995,7 @@ private int TryAsyncContinuation(Task<int> task)
 		{
 			if (task.IsFaulted)
 			{
-				SetFailed();
+				SetFailed(task.Exception.InnerException);
 				task.GetAwaiter().GetResult();
 			}
 			return 0;
@@ -1004,7 +1004,7 @@ private int TryAsyncContinuation(Task<int> task)
 		private PayloadData TryAsyncContinuation(Task<ArraySegment<byte>> task)
 		{
 			if (task.IsFaulted)
-				SetFailed();
+				SetFailed(task.Exception.InnerException);
 			ArraySegment<byte> bytes;
 			try
 			{
@@ -1021,9 +1021,10 @@ private PayloadData TryAsyncContinuation(Task<ArraySegment<byte>> task)
 			return payload;
 		}
 
-		internal void SetFailed()
+		internal void SetFailed(Exception exception)
 		{
-			Log.Info("{0} setting state to Failed", m_logArguments);
+			m_logArguments[1] = exception.Message;
+			Log.Info(exception, "{0} setting state to Failed: {1}", m_logArguments);
 			lock (m_lock)
 				m_state = State.Failed;
 		}

src/MySqlConnector/MySql.Data.MySqlClient/MySqlDataReader.cs

@@ -96,7 +96,7 @@ private void ActivateResultSet(ResultSet resultSet)
 				// for any exception not created from an ErrorPayload, mark the session as failed (because we can't guarantee that all data
 				// has been read from the connection and that the socket is still usable)
 				if (mySqlException?.SqlState == null)
-					Command.Connection.Session.SetFailed();
+					Command.Connection.Session.SetFailed(resultSet.ReadResultSetHeaderException);
 
 				throw mySqlException != null ?
 					new MySqlException(mySqlException.Number, mySqlException.SqlState, mySqlException.Message, mySqlException) :