1 files changed, 28 insertions, 0 deletions
diff --git a/js/src/tests/non262/regress/regress-1466387-worker-grayroot.js b/js/src/tests/non262/regress/regress-1466387-worker-grayroot.js
new file mode 100644
index 0000000000..32b74b0792
--- /dev/null
+++ b/js/src/tests/non262/regress/regress-1466387-worker-grayroot.js
@@ -0,0 +1,28 @@
+var BUGNUMBER = 1466387;
+var summary = 'grayRoot() testing on worker thread';
+
+// Before bug 1466387, the gray root tracer was not set up on worker threads,
+// but the grayRoot() function was still available. This resulted in a GC
+// collecting the gray root, then a read barrier firing on the dead object.
+//
+// This is a crashtest. If it does not crash, it will throw a ReferenceError,
+// but that's ok.
+
+print('BUGNUMBER: ' + BUGNUMBER);
+print("STATUS: " + summary);
+
+if (typeof 'evalInWorder' == 'function') {
+    evalInWorker(`
+  var wm = new WeakMap();
+  grayRoot().map = wm;
+  gczeal(4,10);
+  evaluate(\`
+  grayRoot().map = __v_1173;
+  if (!class i   { constructor() { } }  ()) {
+    (function __f_252( get       ,    )  {})();
+  }
+  \`);
+`);
+}
+
+this.reportCompare && reportCompare(true, true, summary);