diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/alloc-many-objs.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/alloc-many-objs.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+load(libdir + "parallelarray-helpers.js");
+
+function testMap() {
+  // At least on my machine, this test is successful, whereas
+  // `alloc-too-many-objs.js` fails to run in parallel because of
+  // issues around GC.
+
+  var nums = range(0, 10);
+
+  assertParallelModesCommute(["seq", "par"], function(m) {
+    print(m.mode+" "+m.expect);
+    nums.mapPar(function (v) {
+      var x = [];
+      for (var i = 0; i < 45000; i++) {
+        x[i] = {from: v};
+      }
+      return x;
+    }, m)
+  });
+}
+
+if (getBuildConfiguration().parallelJS)
+  testMap();
+