--- //depot/vendor/freebsd/src/sys/fs/ntfs/ntfs_subr.c	2008/01/24 12:35:50
+++ //depot/user/attilio/attilio_schedlock/fs/ntfs/ntfs_subr.c	2008/02/06 13:47:04
@@ -463,6 +463,9 @@
 		ntfs_freentvattr(vap);
 	}
 	mtx_unlock(&ip->i_interlock);
+	mtx_assert(&ip->i_interlock, MA_NOTOWNED);
+	KASSERT(!lockstatus(&ip->i_lock, curthread),
+	    ("%s: lock should be unreleased!", __func__));
 	mtx_destroy(&ip->i_interlock);
 	lockdestroy(&ip->i_lock);
 	vrele(ip->i_devvp);