Index: geom_event.c
===================================================================
RCS file: /usr/repo/src/sys/geom/geom_event.c,v
retrieving revision 1.54
diff -u -p -r1.54 geom_event.c
--- geom_event.c	4 Sep 2005 19:14:19 -0000	1.54
+++ geom_event.c	4 Nov 2005 19:25:12 -0000
@@ -50,6 +50,7 @@ __FBSDID("$FreeBSD: src/sys/geom/geom_ev
 #include <sys/proc.h>
 #include <sys/errno.h>
 #include <sys/time.h>
+#include <sys/stack.h>
 #include <geom/geom.h>
 #include <geom/geom_int.h>
 
@@ -71,12 +72,29 @@ struct g_event {
 	void			*arg;
 	int			flag;
 	void			*ref[G_N_EVENTREFS];
+	struct stack		stack;
 };
 
 #define EV_DONE		0x80000
 #define EV_WAKEUP	0x40000
 #define EV_CANCELED	0x20000
 
+/*
+ * For use from DDB.
+ */
+void
+g_show_events(void)
+{
+	struct g_event *ep;
+
+	printf("%s: START\n", __func__);
+	TAILQ_FOREACH(ep, &g_events, events) {
+		printf("EVENT_FUNC: %p\n", ep->func);
+		stack_print(&ep->stack);
+	}
+	printf("%s: END\n", __func__);
+}
+
 void
 g_waitidle(void)
 {
@@ -297,6 +315,7 @@ g_post_event_x(g_event_t *func, void *ar
 	KASSERT(p == NULL, ("Too many references to event"));
 	ep->func = func;
 	ep->arg = arg;
+	stack_save(&ep->stack);
 	mtx_lock(&g_eventlock);
 	TAILQ_INSERT_TAIL(&g_events, ep, events);
 	mtx_unlock(&g_eventlock);
Index: geom.h
===================================================================
RCS file: /usr/repo/src/sys/geom/geom.h,v
retrieving revision 1.91
diff -u -p -r1.91 geom.h
--- geom.h	3 Sep 2005 11:03:10 -0000	1.91
+++ geom.h	4 Nov 2005 19:25:17 -0000
@@ -215,6 +215,7 @@ int g_waitfor_event(g_event_t *func, voi
 void g_cancel_event(void *ref);
 void g_orphan_provider(struct g_provider *pp, int error);
 void g_waitidlelock(void);
+void g_show_events(void);
 
 /* geom_subr.c */
 int g_access(struct g_consumer *cp, int nread, int nwrite, int nexcl);