Index: geom_subr.c
===================================================================
RCS file: /private/FreeBSD/src/sys/geom/geom_subr.c,v
retrieving revision 1.75
diff -u -p -r1.75 geom_subr.c
--- geom_subr.c	18 Mar 2004 07:17:10 -0000	1.75
+++ geom_subr.c	4 Jun 2004 12:45:26 -0000
@@ -289,7 +289,8 @@ g_wither_geom(struct g_geom *gp, int err
 		cp2 = LIST_NEXT(cp, consumer);
 		if (cp->acr || cp->acw || cp->ace)
 			continue;
-		g_detach(cp);
+		if (cp->provider != NULL)
+			g_detach(cp);
 		g_destroy_consumer(cp);
 	}
 	if (LIST_EMPTY(&gp->provider) && LIST_EMPTY(&gp->consumer))