--- java/org/apache/tomcat/util/net/Nio2Channel.java	(revision 1711436)
+++ java/org/apache/tomcat/util/net/Nio2Channel.java	(working copy)
@@ -128,9 +128,21 @@ 
         return super.toString()+":"+this.sc.toString();
     }
 
+    private volatile Exception trace = null;
     @Override
     public Future<Integer> read(ByteBuffer dst) {
-        return sc.read(dst);
+        try {
+            throw new Exception(Thread.currentThread().getName());
+        } catch (Exception e) {
+            trace = e;
+        }
+        try {
+            return sc.read(dst);
+        } catch (java.nio.channels.ReadPendingException e) {
+            System.out.println("Read pending " + Thread.currentThread().getName());
+            trace.printStackTrace();
+            throw e;
+        }
     }
 
     @Override