RH_HOLD_ALL
assert(mask != 0 && (mask & ~RH_HOLD_ALL) == 0);
handle_hold_subhandles(handle, RH_HOLD_ALL);
assert(mask != 0 && (mask & ~RH_HOLD_ALL) == 0);
handle_hold_subhandles(ret, RH_HOLD_ALL);
handle_rele_subhandles(ret, RH_HOLD_ALL);