diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Frame-onPop-20.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Frame-onPop-20.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+// A global garbage collection does not disturb onPop handlers.
+var g = newGlobal();
+var dbg = new Debugger(g);
+var log;
+
+dbg.onEnterFrame = function handleEnter(frame) {
+    log += '(';
+    frame.onPop = function handlePop(completion) {
+        log += ')';
+    };
+};
+
+log = '';
+assertEq(g.eval('gc(); 42;'), 42);
+assertEq(log, '()');