diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/gc-timeout.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/gc-timeout.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,27 @@
+// |jit-test| exitstatus: 6;
+
+// One sneaky way to run GC during a parallel section is to invoke the
+// gc() function during the parallel timeout!
+
+load(libdir + "parallelarray-helpers.js");
+
+function iterate(x) {
+  while (x == 2046) {
+    // for exactly one index, this infinitely loops!
+    // this ensures that the warmup doesn't loop.
+  }
+  return 22;
+}
+
+function timeoutfunc() {
+  print("Timed out, invoking the GC");
+  gc();
+  return false;
+}
+
+timeout(1, timeoutfunc);
+
+if (getBuildConfiguration().parallelJS)
+  Array.buildPar(2048, iterate);
+else
+  while(true);