diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Frame-onPop-multiple-04.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Frame-onPop-multiple-04.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,27 @@
+// If one Debugger's onPop handler causes another Debugger to create a
+// Debugger.Frame instance referring to the same frame, that frame still
+// gets marked as not live after all the onPop handlers have run.
+var g = newGlobal();
+var dbg1 = new Debugger(g);
+var dbg2 = new Debugger(g);
+
+var log;
+var frame2;
+
+dbg1.onEnterFrame = function handleEnter(frame) {
+    log += '(';
+    frame.onPop = function handlerPop1(c) {
+        log += ')';
+        frame2 = dbg2.getNewestFrame();
+        assertEq(frame2.live, true);
+        frame2.onPop = function handlePop2(c) {
+            assertEq("late frame's onPop handler ran",
+                     "late frame's onPop handler should not run");
+        };
+    };
+};
+
+log = '';
+assertEq(g.eval('40 + 2'), 42);
+assertEq(log, '()');
+assertEq(frame2.live, false);