diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_3/extensions/regress-327170.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_3/extensions/regress-327170.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,25 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 327170;
+var summary = 'Reuse of RegExp in string.replace(rx.compile(...), function() { rx.compile(...); }) causes a crash';
+var actual = 'No Crash';
+var expect = 'No Crash';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+
+var g_rx = /(?:)/;
+
+"this is a test-string".replace(g_rx.compile("test", "g"),
+				function()
+				{
+				  // re-use of the g_rx RegExp object,
+				  // that's currently in use by the replace fn.
+				  g_rx.compile("string", "g");
+				});
+ 
+reportCompare(expect, actual, summary);