4a0a4d4f30
unlocked vnode when trying to rename a directory. The fix was to shuffle some bits around and #pray. The rename routine actually needs a very very major wide-angle whopping: * it takes locks out-of-order * it deals with references from SAVESTART lookups in interesting ways * I doubt there is any guarantee for correct operation if there are multiple concurrent accesses * the error branches might just as well call panic() directly