MLXCX_BUFFER_INIT
b->mlb_state = MLXCX_BUFFER_INIT;
VERIFY(b->mlb_state == MLXCX_BUFFER_INIT);
case MLXCX_BUFFER_INIT:
b->mlb_state == MLXCX_BUFFER_INIT);
b->mlb_state = MLXCX_BUFFER_INIT;