--- sys/fs/nfsserver/nfs_nfsdport.c.sav	2020-10-02 12:14:36.128809000 -0700
+++ sys/fs/nfsserver/nfs_nfsdport.c	2020-10-02 12:16:44.630649000 -0700
@@ -2565,6 +2565,7 @@ again:
 						} else {
 							r = VOP_LOOKUP(vp, &nvp,
 							    &cn);
+if (r != 0) printf("rdirplus lookup err=%d\n", r);
 							if (vp != nvp)
 								NFSVOPUNLOCK(vp);
 						}