--- libaitsched/src/hooks.c	2013/08/26 08:20:55	1.21
+++ libaitsched/src/hooks.c	2013/08/26 14:29:20	1.21.4.1
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@openbsd-bg.org>
 *
 * $Author: misho $
-* $Id: hooks.c,v 1.21 2013/08/26 08:20:55 misho Exp $
+* $Id: hooks.c,v 1.21.4.1 2013/08/26 14:29:20 misho Exp $
 *
 **************************************************************************
 The ELWIX and AITNET software is distributed under the following
@@ -1182,6 +1182,9 @@ sched_hook_rtc(void *task, void *arg __unused)
 		timer_delete(tmr);
 		return (void*) -1;
 	}
+
+	if (!TASK_ISLOCKED(t))
+		TASK_LOCK(t);
 
 	return NULL;
 }