Created attachment 34124 [details]
Add log message when ap_mutex_register fails

Function ap_mutex_register may fail. The majority of calls have checked the return value and printed log message like the following code snippet, while the others have not. Those unchecked ones probably need logs too (see attachment).


/* httpd-2.4.10/modules/proxy/mod_proxy.c:2687:23 */
    apr_status_t rv = ap_mutex_register(pconf, proxy_id, NULL,
            APR_LOCK_DEFAULT, 0);
    if (rv != APR_SUCCESS) {
        ap_log_perror(APLOG_MARK, APLOG_CRIT, rv, plog, APLOGNO(02480)
                "failed to register %s mutex", proxy_id);
        return 500; /* An HTTP status would be a misnomer! */
    }