--- src/winsup/cygwin/thread.cc.old	2012-08-17 01:34:45.000000000 +0200
+++ src/winsup/cygwin/thread.cc	2013-01-06 17:58:46.258963200 +0100
@@ -1427,7 +1427,7 @@ pthread_rwlock::tryrdlock ()
 
   mtx.lock ();
 
-  if (writer || waiting_writers || lookup_reader (self))
+  if (writer || waiting_writers)
     result = EBUSY;
   else
     {