system/checkconf/bad-sharedwritable1.conf

/*
 * Copyright (C) 2014, 2016  Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

zone a {
    type master;
    file "shared.db";
};
zone b {
    type slave;
    file "shared.db";
    masters { 1.2.3.4; };
};