Fixed issue with circular references.

src/CsvHelper.Tests/AutoMapping/CircularReferenceTests.cs

@@ -6,6 +6,13 @@ namespace CsvHelper.Tests.AutoMapping
 	[TestClass]
     public class CircularReferenceTests
     {
+		[TestMethod]
+		public void SelfCircularDependencyTest()
+		{
+			var config = new CsvHelper.Configuration.Configuration();
+			var map = config.AutoMap<SelfCircularA>();
+		}
+
 		[TestMethod]
 		public void CircularDependencyTest()
 		{
@@ -27,6 +34,23 @@ public void CircularDependencyWithMultiplePropertiesTest()
 			Assert.AreEqual( 3, map.ReferenceMaps.Count );
 		}
 
+		private class SelfCircularA
+		{
+			public SelfCircularB Circular { get; set; }
+		}
+
+		private class SelfCircularB
+		{
+			public SelfCircularB Self { get; set; }
+
+			public SelfCircularC C { get; set; }
+		}
+
+		private class SelfCircularC
+		{
+			public string Id { get; set; }
+		}
+
 		private class ACircular
 		{
 			public string Id { get; set; }

src/CsvHelper/LinkedListExtensions.cs

@@ -19,15 +19,14 @@ public static void Drop<T>( this LinkedList<T> list, LinkedListNode<T> node )
 				return;
 			}
 
-			var nodeToDrop = list.Find( node.Value );
-			while( list.Count > 0 && list.Last != nodeToDrop )
-			{
-				list.RemoveLast();
-			}
-
-			if( list.Last == nodeToDrop )
+			while( list.Count > 0 )
 			{
+				var nodeToRemove = list.Last;
 				list.RemoveLast();
+				if( nodeToRemove == node )
+				{
+					break;
+				}
 			}
 		}
 	}