Index: geom_event.c
===================================================================
RCS file: /private/FreeBSD/src/sys/geom/geom_event.c,v
retrieving revision 1.47
diff -u -p -r1.47 geom_event.c
--- geom_event.c	2 Feb 2004 10:58:07 -0000	1.47
+++ geom_event.c	4 Feb 2004 13:28:01 -0000
@@ -316,6 +316,7 @@ g_waitfor_event(g_event_t *func, void *a
 	int error;
 
 	/* g_topology_assert_not(); */
+	sx_assert(&g_eventstall, SX_UNLOCKED);
 	KASSERT(flag == M_WAITOK || flag == M_NOWAIT,
 	    ("Wrong flag to g_post_event"));
 	va_start(ap, flag);