diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_8/extensions/regress-479381.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_8/extensions/regress-479381.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,51 @@
+// |reftest| skip
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ * Contributor: Jason Orendorff
+ */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 479381;
+var summary = 'Do not crash @ js_FinalizeStringRT with multi-threads.';
+var actual = '';
+var expect = '';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+
+  if (typeof gczeal != 'function' || typeof scatter != 'function')
+  {
+    print(expect = actual = 'Test skipped: requires mulithreads');
+  }
+  else
+  {
+    expect = actual = 'No Crash';
+
+    gczeal(2);
+
+    function f() {
+      var s;
+      for (var i = 0; i < 9999; i++)
+        s = 'a' + String(i)[3] + 'b';
+      return s;
+    }
+
+    print(scatter([f, f, f, f]));
+
+    gczeal(0);
+  }
+
+  reportCompare(expect, actual, summary);
+
+  exitFunc ('test');
+}