diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/GC/regress-341877-02.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/GC/regress-341877-02.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,45 @@
+/* -*- 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 = 341877;
+var summary = 'GC hazard with for-in loop';
+var actual = 'No Crash';
+var expect = 'No Crash';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+
+var obj = { };
+
+var prop = "xsomePropety".substr(1);
+
+obj.first = "first"
+
+  obj[prop] = 1;
+
+for (var elem in obj) {
+  var tmp = elem.toString();
+  delete obj[prop];
+  // ensure that prop is cut from all roots
+  prop = "xsomePropety".substr(2);
+  obj[prop] = 2;
+  delete obj[prop];
+  prop = null;
+  if (typeof gc == 'function')
+    gc();
+  for (var i = 0; i != 50000; ++i) {
+    var tmp = 1 / 3;
+    tmp /= 10;
+  }
+  for (var i = 0; i != 1000; ++i) {
+    // Make string with 11 characters that would take
+    // (11 + 1) * 2 bytes or sizeof(JSAtom) so eventually
+    // malloc will ovewrite just freed atoms.
+    var tmp2 = Array(12).join(' ');
+  }
+}
+ 
+reportCompare(expect, actual, summary);