gistfile1.txt

        static int EIO_AfterDrawMap(eio_req *req) {
          HandleScope scope;
          drawmap_request *drawmap_req =(drawmap_request *)req->data;
          ev_unref(EV_DEFAULT_UC);
          drawmap_req->map->Unref();

          Local<Value> argv[2];
          argv[0] = Local<Value>::New(Null());
          if (drawmap_req->data != NULL) {
            Buffer * buffer = Buffer::New(drawmap_req->data, drawmap_req->size, FreeImageBuffer, NULL);
          
            argv[1] = scope.Close(buffer->handle_);
          } else {
            argv[0] = Integer::New(1);
            // TODO: how to return the msErrorObj here?
            errorObj * err = msGetErrorObj();
            Local<Value> _arg_ = External::New(err);
            Persistent<Object> _err_(ErrorObj::constructor_template->GetFunction()->NewInstance(1, &_arg_));
            
            argv[0] = Local<Value>::New(_err_);
            // argv[0] = Integer::New(1);
            
          }

          TryCatch try_catch;

          drawmap_req->cb->Call(Context::GetCurrent()->Global(), 1, argv);

          if (try_catch.HasCaught()) {
            FatalException(try_catch);
          }

          drawmap_req->cb.Dispose();
          delete drawmap_req;
          return 0;
        }

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000030
0x0000000100119e17 in v8::internal::JSObject::GetElementWithReceiver ()
(gdb) bt
#0 0x0000000100119e17 in v8::internal::JSObject::GetElementWithReceiver ()
#1 0x0000000100181835 in v8::internal::Runtime::GetObjectProperty ()

Previous frame inner to this frame (gdb could not unwind past this frame)