* gc.c (rb_objspace_markable_object_p): it should be live objects.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44236 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Mon Dec 16 18:04:28 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c (rb_objspace_markable_object_p): it should be live objects.
+
 Mon Dec 16 18:00:51 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* gc.c (rb_objspace_each_objects): should not clear dont_lazy_sweep

gc.c

@@ -2266,7 +2266,7 @@ is_markable_object(rb_objspace_t *objspace, VALUE obj)
 int
 rb_objspace_markable_object_p(VALUE obj)
 {
-    return is_markable_object(&rb_objspace, obj);
+    return is_live_object(obj) && is_markable_object(&rb_objspace, obj);
 }
 
 /*