diff --git a/sys/fs/pseudofs/pseudofs_internal.h b/sys/fs/pseudofs/pseudofs_internal.h
--- a/sys/fs/pseudofs/pseudofs_internal.h
+++ b/sys/fs/pseudofs/pseudofs_internal.h
@@ -157,8 +157,8 @@
 
 	PFS_TRACE(("%s", pn->pn_name));
 	KASSERT(pn->pn_vis != NULL, ("%s(): no callback", __func__));
-	KASSERT(p != NULL, ("%s(): no process", __func__));
-	PROC_LOCK_ASSERT(p, MA_OWNED);
+	if (p != NULL)
+		PROC_LOCK_ASSERT(p, MA_OWNED);
 	pfs_assert_not_owned(pn);
 	return ((pn->pn_vis)(PFS_VIS_ARGNAMES));
 }
diff --git a/sys/fs/pseudofs/pseudofs_vnops.c b/sys/fs/pseudofs/pseudofs_vnops.c
--- a/sys/fs/pseudofs/pseudofs_vnops.c
+++ b/sys/fs/pseudofs/pseudofs_vnops.c
@@ -118,8 +118,11 @@
 
 	if (p)
 		*p = NULL;
-	if (pid == NO_PID)
+	if (pid == NO_PID) {
+		if (pn->pn_vis != NULL)
+			PFS_RETURN (pn_vis(td, NULL, pn));
 		PFS_RETURN (1);
+	}
 	proc = pfind(pid);
 	if (proc == NULL)
 		PFS_RETURN (0);
@@ -826,7 +829,8 @@
 	} else if (proc != NULL) {
 		visible = pfs_visible_proc(td, *pn, proc);
 	} else {
-		visible = 1;
+		if ((*pn)->pn_vis != NULL)
+			visible = pn_vis(td, NULL, *pn);
 	}
 	if (!visible)
 		goto again;