diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/GC/regress-278725.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/GC/regress-278725.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,29 @@
+/* -*- 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/. */
+
+//-----------------------------------------------------------------------------
+// testcase by James Ross <silver@warwickcompsoc.co.uk>
+var BUGNUMBER = 278725;
+var summary = 'Don\'t Crash during GC';
+var actual = 'Crash';
+var expect = 'No Crash';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+
+var results = [];
+for (var k = 0; k < 600000; k++) {
+  if (! (k %100000)) {
+    printStatus('hi');
+    if (0) {
+      results.length = 0;
+      gc();
+    }
+  }
+  results.push({});
+}
+
+actual = 'No Crash';
+reportCompare(expect, actual, summary);