Avoid busy loop while waiting for rekey response

common-session.c

@@ -550,10 +550,12 @@ static void update_timeout(long limit, long now, long last_event, long * timeout
 static long select_timeout() {
 	/* determine the minimum timeout that might be required, so
 	as to avoid waking when unneccessary */
-	long timeout = LONG_MAX;
+	long timeout = KEX_REKEY_TIMEOUT;
 	long now = monotonic_now();
 
-	update_timeout(KEX_REKEY_TIMEOUT, now, ses.kexstate.lastkextime, &timeout);
+	if (!ses.kexstate.sentkexinit) {
+		update_timeout(KEX_REKEY_TIMEOUT, now, ses.kexstate.lastkextime, &timeout);
+	}
 
 	if (ses.authstate.authdone != 1 && IS_DROPBEAR_SERVER) {
 		/* AUTH_TIMEOUT is only relevant before authdone */