diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Frame-identity-04.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Frame-identity-04.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+// Test that on-stack Debugger.Frames are not GC'd even if they are only reachable
+// from the js::Debugger::frames table.
+
+var g = newGlobal();
+g.eval("function f(n) { if (n) f(n - 1); debugger; }");
+var dbg = new Debugger(g);
+var hits = 0;
+dbg.onDebuggerStatement = function (frame) {
+    if (hits === 0) {
+        for (; frame; frame = frame.older)
+            frame.seen = true;
+    } else {
+        for (; frame; frame = frame.older)
+            assertEq(frame.seen, true);
+    }
+    gc();
+    hits++;
+};
+g.f(20);
+assertEq(hits, 21);