The following code asserts on jsdbg2 branch (revision 48e43edc8834, options -j -m): var g = newGlobal('new-compartment'); var dbg = Debugger(g); dbg.onDebuggerStatement = function (frame) { var s = frame.eval("f").return.script; }; function test(s) { g.eval("line0 = Error().lineNumber;\n" + "debugger;\n" + // line0 + 1 "function f(i) {\n" + // line0 + 2 "}\n"); } test("i = 128;\n" + "}\n"); var hits = 0; dbg.onNewScript = function (s) { hits++; }; assertEq(g.eval("eval('2 + 3')"), 5); this.gczeal(hits, 2); var fn = g.Function("a", "return 5 + a;"); var g2 = newGlobal('new-compartment'); dbg.addDebuggee(g2, dbg); g2.clone(fn);

I'm not able to reproduce this crash, even under valgrind. I'm using the given revision and options.

Automatically extracted testcase for this bug was committed: https://hg.mozilla.org/mozilla-central/rev/2e891e0db397