pd->aio_events = malloc(td->o.iodepth * sizeof(struct io_u *));
memset(pd->aio_events, 0, td->o.iodepth * sizeof(struct io_u *));
pd->aio_events = malloc(td->o.iodepth * sizeof(struct io_u *));
memset(pd->aio_events, 0, td->o.iodepth * sizeof(struct io_u *));