invalid UTF-8 error

[kwunlyou]

Terraform Version

Terraform v0.12.9
+ provider.aws v2.29.0

Terraform Configuration Files

provider "aws" {
    region = "${var.aws_region}"
}

resource "aws_spot_instance_request" "cheap_worker" {
    spot_price = "${var.cheap_worker_spot_price}"
    wait_for_fulfillment = true
    spot_type = "one-time"

    ami = "${var.ami}"
    instance_type = "${var.cheap_worker_instance_type}"
    key_name = "${var.key_name}"

    subnet_id = "subnet-XXX"
    vpc_security_group_ids = ["sg-XXX"]
    associate_public_ip_address = false

    root_block_device {
        volume_type = "gp2"
        volume_size = "${var.cheap_worker_volume_size}"
        delete_on_termination = "true"
    }

    connection {
        user = "ubuntu"
        private_key = "${file("${var.key_path}")}"
        host ="${aws_spot_instance_request.cheap_worker.private_ip}"
    }

    provisioner "local-exec" {
        command = "aws ec2 create-tags --resources ${self.spot_instance_id} --tags Key=Name,Value=${var.cheap_worker_name}"
    }

    provisioner "file" {
        source = "${var.aws_conf_path}"
        destination = "~/.aws/"
    }

    provisioner "file" {
        source = "./files"
        destination = "/tmp/files"
    }

    provisioner "remote-exec" {
        inline = [
            "sleep 30",
            "chmod +x /tmp/files/bootstrap.sh",
            "/tmp/files/bootstrap.sh",
            "git config --global user.name ${var.git_user_name}",
            "git config --global user.email ${var.git_user_email}"
        ]
    }

    tags = {
        Name = "${var.cheap_worker_name}"
    }
}

Debug Output

gist

Crash Output

Error: rpc error: code = Internal desc = grpc: error while marshaling: proto: field "tfplugin5.ProvisionResource.Response.Output" contains invalid UTF-8

Expected Behavior

continue to get the spot instance

Actual Behavior

terminate with errors

Steps to Reproduce

1. terraform init
2. terraform apply

Additional Context

References

[ghost]

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