diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Debugger-debuggees-16.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Debugger-debuggees-16.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+// GC can turn off debug mode in a compartment.
+
+var dbgs = [];
+var nonDebugGlobals = [];
+var f = gc;
+for (var i = 0; i < 4; i++) {
+    // Create two globals, one debuggee.
+    var g1 = newGlobal();
+    var g2 = g1.eval("newGlobal('same-compartment')");
+    var dbg = Debugger(g1);
+    dbg.onDebuggerStatement = function () {};
+
+    // Thread a chain of functions through the non-debuggee globals.
+    g2.eval("function f() { return g() + 1; }");
+    g2.g = f;
+    f = g2.f;
+
+    // Root the Debugger objects and non-debuggee globals.
+    dbgs[i] = dbg;
+    nonDebugGlobals[i] = g2;
+}
+
+// Call the chain of functions. At the end of the chain is gc. This will
+// collect (some or all of) the debuggee globals, leaving non-debuggee
+// globals. It should disable debug mode in those debuggee compartments.
+nonDebugGlobals[nonDebugGlobals.length - 1].f();
+
+gc();
+nonDebugGlobals[0].g = function () { return 0; }
+assertEq(nonDebugGlobals[nonDebugGlobals.length - 1].f(), nonDebugGlobals.length);