diff --git a/sys/fs/unionfs/union_vfsops.c b/sys/fs/unionfs/union_vfsops.c
--- a/sys/fs/unionfs/union_vfsops.c
+++ b/sys/fs/unionfs/union_vfsops.c
@@ -348,7 +348,8 @@
 	if ((ump->um_lowermp->mnt_flag & MNT_LOCAL) != 0 &&
 	    (ump->um_uppermp->mnt_flag & MNT_LOCAL) != 0)
 		mp->mnt_flag |= MNT_LOCAL;
-	mp->mnt_kern_flag |= MNTK_NOMSYNC | MNTK_UNIONFS;
+	mp->mnt_kern_flag |= MNTK_NOMSYNC | MNTK_UNIONFS |
+	    (ump->um_uppermp->mnt_kern_flag & MNTK_SHARED_WRITES);
 	MNT_IUNLOCK(mp);
 
 	/*
diff --git a/sys/fs/unionfs/union_vnops.c b/sys/fs/unionfs/union_vnops.c
--- a/sys/fs/unionfs/union_vnops.c
+++ b/sys/fs/unionfs/union_vnops.c
@@ -998,14 +998,22 @@
 	struct unionfs_node *unp;
 	struct unionfs_node_status *unsp;
 	struct vnode *ovp;
+	enum unionfs_lkupgrade lkstatus;
 
 	KASSERT_UNIONFS_VNODE(ap->a_vp);
 
 	unp = VTOUNIONFS(ap->a_vp);
+	lkstatus = unionfs_upgrade_lock(ap->a_vp);
+	if (lkstatus == UNIONFS_LKUPGRADE_DOOMED) {
+		unionfs_downgrade_lock(ap->a_vp, lkstatus);
+		return (ENOENT);
+	}
 	unionfs_get_node_status(unp, ap->a_td, &unsp);
 	ovp = (unsp->uns_upper_opencnt ? unp->un_uppervp : unp->un_lowervp);
 	unionfs_tryrem_node_status(unp, unsp);
 
+	unionfs_downgrade_lock(ap->a_vp, lkstatus);
+
 	if (ovp == NULLVP)
 		return (EBADF);