diff --git a/sys/geom/geom_subr.c b/sys/geom/geom_subr.c
--- a/sys/geom/geom_subr.c
+++ b/sys/geom/geom_subr.c
@@ -575,8 +575,8 @@
 		return;
 	pp = arg;
 	G_VALID_PROVIDER(pp);
-	KASSERT(!(pp->flags & G_PF_WITHER),
-	    ("g_new_provider_event but withered"));
+	if ((pp->flags & G_PF_WITHER) != 0)
+		return;
 	LIST_FOREACH_SAFE(cp, &pp->consumers, consumers, next_cp) {
 		if ((cp->flags & G_CF_ORPHAN) == 0 &&
 		    cp->geom->attrchanged != NULL)