diff --git a/ChangeLog b/ChangeLog
index b4f4fe47b3..c4126756e0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,14 @@
+Sat Dec 15 00:03:31 2012  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* signal.c (rb_f_kill): remove rb_thread_polling() because this
+	  has no good effect and makes meaningless 100ms delay. 1)
+	  when sending signal to another process, waiting has just silly.
+	  2) when sending signal to current process, 100ms is often not
+	  enough time to wait. It depend on kernel behavior. And,
+	  rb_thread_polling() doesn't make sense anyway. When rb_thread_alone()
+	  is true, it doesn't wait at all and Process.kill() users don't
+	  expect threading changes Process.kill() behavior. [Bug #7560]
+
 Fri Dec 14 17:10:57 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* parse.y (parser_params): parser_tokline to track the line number at
diff --git a/signal.c b/signal.c
index 0d41fada5a..59ffde93db 100644
--- a/signal.c
+++ b/signal.c
@@ -425,7 +425,6 @@ rb_f_kill(int argc, VALUE *argv)
 		rb_sys_fail(0);
 	}
     }
-    rb_thread_polling();
     return INT2FIX(i-1);
 }