diff --git a/ChangeLog b/ChangeLog
index 70d4613b8c..520476a1d8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+Thu Mar 14 12:59:59 2013  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* file.c (rb_sys_fail_path0): add to append the name of called function
+	  to ease debugging for example blow umask_spec failure.
+	  http://fbsd.rubyci.org/~chkbuild/ruby-trunk/log/20130309T010202Z.diff.html.gz
+
+	* file.c (rb_sys_fail_path): use rb_sys_fail_path0.
+
 Thu Mar 14 12:53:15 2013  Luis Lavena  <luislavena@gmail.com>
 
 	* win32/file.c (get_user_from_path):  add internal function that retrieves
diff --git a/file.c b/file.c
index d5abe304cf..3ee68f561f 100644
--- a/file.c
+++ b/file.c
@@ -102,7 +102,16 @@ int flock(int, int);
 #define STAT(p, s)	stat((p), (s))
 #endif
 
-#define rb_sys_fail_path(path) rb_sys_fail_str(path)
+#define rb_sys_fail_path(path) rb_sys_fail_path0(__func__, path)
+
+NORETURN(static void rb_sys_fail_path0(const char *,VALUE));
+static void
+rb_sys_fail_path0(const char *func_name, VALUE path)
+{
+    VALUE mesg = rb_str_new_cstr(func_name);
+    rb_str_buf_append(mesg, path);
+    rb_sys_fail_str(mesg);
+}
 
 #if defined(__BEOS__) || defined(__HAIKU__) /* should not change ID if -1 */
 static int