isc_loopmgr_pause was called inappropriately

isc_loopmgr_pause can't be called before isc_loopmgr_run is
called as the thread ids are not yet valid.  If there is a
fatal error before isc_loopmgr_run is run then don't call
isc_loopmgr_pause.

bin/named/include/named/globals.h

@@ -53,6 +53,7 @@ EXTERN unsigned int named_g_cpus	      INIT(0);
 EXTERN unsigned int named_g_udpdisp	      INIT(0);
 EXTERN isc_loop_t *named_g_mainloop	      INIT(NULL);
 EXTERN isc_loopmgr_t *named_g_loopmgr	      INIT(NULL);
+EXTERN bool named_g_loopmgr_running	      INIT(false);
 EXTERN dns_dispatchmgr_t *named_g_dispatchmgr INIT(NULL);
 EXTERN unsigned int named_g_cpus_detected     INIT(1);
 

bin/named/main.c

@@ -1506,6 +1506,10 @@ main(int argc, char *argv[]) {
 	 */
 	isc_signal_start(named_g_server->sighup);
 
+	/*
+	 * Pause the loop manager in fatal.
+	 */
+	named_g_loopmgr_running = true;
 	isc_loopmgr_run(named_g_loopmgr);
 
 #ifdef HAVE_LIBSCF

bin/named/server.c

@@ -10286,7 +10286,9 @@ named_server_destroy(named_server_t **serverp) {
 
 static void
 fatal(const char *msg, isc_result_t result) {
+	if (named_g_loopmgr_running) {
 		isc_loopmgr_pause(named_g_loopmgr);
+	}
 	isc_log_write(named_g_lctx, NAMED_LOGCATEGORY_GENERAL,
 		      NAMED_LOGMODULE_SERVER, ISC_LOG_CRITICAL, "%s: %s", msg,
 		      isc_result_totext(result));