cancel()
		if err == nil {
			break
		}
		if minio.ToErrorResponse(err).Code == "PreconditionFailed" {
			return nil
		}
		attempts++
		time.Sleep(time.Duration(rand.Int63n(int64(time.Second))))
	}
	if err != nil {
		return err
	}

	defer func() {
		if err != nil {
			// block and abort remote upload upon failure.
			attempts := 1
			for attempts <= 3 {