diff --git a/sys/fs/nfs/nfs_commonsubs.c b/sys/fs/nfs/nfs_commonsubs.c
--- a/sys/fs/nfs/nfs_commonsubs.c
+++ b/sys/fs/nfs/nfs_commonsubs.c
@@ -1427,9 +1427,15 @@
 				NFSCLRBIT_ATTRBIT(&checkattrbits, NFSATTRBIT_ACLSUPPORT);
 		   	   }
 			   /* Some filesystems do not support uf_hidden */
-			   if (vp == NULL || VOP_PATHCONF(vp,
-				_PC_HAS_HIDDENSYSTEM, &has_pathconf) != 0)
-			       has_pathconf = 0;
+			   if (vp == NULL) {
+				   has_pathconf = 0;
+			   } else {
+				   vn_lock(vp, LK_SHARED | LK_RETRY);
+				   if (VOP_PATHCONF(vp, _PC_HAS_HIDDENSYSTEM,
+				       &has_pathconf) != 0)
+					   has_pathconf = 0;
+				   VOP_UNLOCK(vp);
+			   }
 			   if (has_pathconf == 0) {
 				 NFSCLRBIT_ATTRBIT(&checkattrbits,
 				    NFSATTRBIT_HIDDEN);
@@ -1536,10 +1542,17 @@
 			NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 			if (compare) {
 				if (!(*retcmpp)) {
-					if (vp == NULL || VOP_PATHCONF(vp,
-					    _PC_HAS_NAMEDATTR, &has_pathconf)
-					    != 0)
+					if (vp == NULL) {
 						has_pathconf = 0;
+					} else {
+						vn_lock(vp, LK_SHARED |
+						    LK_RETRY);
+						if (VOP_PATHCONF(vp,
+						    _PC_HAS_NAMEDATTR,
+						    &has_pathconf) != 0)
+							has_pathconf = 0;
+						VOP_UNLOCK(vp);
+					}
 					if ((has_pathconf != 0 &&
 					     *tl != newnfs_true) ||
 					    (has_pathconf == 0 &&
@@ -2780,10 +2793,15 @@
 			    NFSCLRBIT_ATTRBIT(&attrbits,NFSATTRBIT_ACLSUPPORT);
 			    NFSCLRBIT_ATTRBIT(&attrbits,NFSATTRBIT_ACL);
 			}
-			if (cred == NULL || p == NULL || vp == NULL ||
-			    VOP_PATHCONF(vp, _PC_HAS_HIDDENSYSTEM,
-			    &has_pathconf) != 0)
-			    has_pathconf = 0;
+			if (cred == NULL || p == NULL || vp == NULL) {
+				has_pathconf = 0;
+			} else {
+				vn_lock(vp, LK_SHARED | LK_RETRY);
+				if (VOP_PATHCONF(vp, _PC_HAS_HIDDENSYSTEM,
+				    &has_pathconf) != 0)
+					has_pathconf = 0;
+				VOP_UNLOCK(vp);
+			}
 			if (has_pathconf == 0) {
 			    NFSCLRBIT_ATTRBIT(&attrbits, NFSATTRBIT_HIDDEN);
 			    NFSCLRBIT_ATTRBIT(&attrbits, NFSATTRBIT_SYSTEM);
@@ -2828,9 +2846,11 @@
 			break;
 		case NFSATTRBIT_NAMEDATTR:
 			NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
+			vn_lock(vp, LK_SHARED | LK_RETRY);
 			if (VOP_PATHCONF(vp, _PC_HAS_NAMEDATTR,
 			    &has_pathconf) != 0)
 				has_pathconf = 0;
+			VOP_UNLOCK(vp);
 			if (has_pathconf != 0)
 				*tl = newnfs_true;
 			else