checkdead()
	unlock(&sched.lock)

	for {
		lock(&newmHandoff.lock)
		for newmHandoff.newm != 0 {
			newm := newmHandoff.newm.ptr()
			newmHandoff.newm = 0
			unlock(&newmHandoff.lock)
			for newm != nil {
				next := newm.schedlink.ptr()
				newm.schedlink = 0
				newm1(newm)
				newm = next
			}
			lock(&newmHandoff.lock)
		}
		newmHandoff.waiting = true

	if vv.IsValid() {
		t.Errorf("Invalid key: got non-nil value %s", valueToString(vv))
	}

	newm := newmap.Interface().(map[string]int)
	if len(newm) != len(m) {
		t.Errorf("length after copy: newm=%d, m=%d", len(newm), len(m))
	}

	for k, v := range newm {
		mv, ok := m[k]
		if mv != v {
			t.Errorf("newm[%q] = %d, but m[%q] = %d, %v", k, v, k, mv, ok)
		}
	}