diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Debugger-debuggees-11.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Debugger-debuggees-11.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+// |jit-test| debug
+// Don't allow cycles in the graph of the compartment "debugs" relation.
+
+load(libdir + "asserts.js");
+
+// trivial cycles
+var dbg = new Debugger;
+assertThrowsInstanceOf(function () { dbg.addDebuggee(this); }, TypeError);
+assertThrowsInstanceOf(function () { new Debugger(this); }, TypeError);
+
+// cycles of length 2
+var d1 = newGlobal();
+d1.top = this;
+d1.eval("var dbg = new Debugger(top)");
+assertThrowsInstanceOf(function () { dbg.addDebuggee(d1); }, TypeError);
+assertThrowsInstanceOf(function () { new Debugger(d1); }, TypeError);
+
+// cycles of length 3
+var d2 = newGlobal();
+d2.top = this;
+d2.eval("var dbg = new Debugger(top.d1)");
+assertThrowsInstanceOf(function () { dbg.addDebuggee(d2); }, TypeError);
+assertThrowsInstanceOf(function () { new Debugger(d2); }, TypeError);