resource "aws_volume_attachment" "mysql_data" {
  depends_on = ["null_resource.stop_mysql_service2"]
  device_name = "/dev/xvdf"
  volume_id = "${aws_ebs_volume.create_volume.0.id}"
  instance_id = "i-0d48be4266da"
  skip_destroy = true
  force_detach = true
}

$ ./terraform apply
data.aws_ebs_snapshot.mysql: Refreshing state...
aws_ebs_volume.create_volume: Creating...
  availability_zone: "" => "eu-central-1a"
  encrypted:         "" => "<computed>"
  iops:              "" => "<computed>"
  kms_key_id:        "" => "<computed>"
  size:              "" => "<computed>"
  snapshot_id:       "" => "snap-0afb2303c60f"
  tags.%:            "" => "1"
  tags.Name:         "" => "mysql"
  type:              "" => "gp2"
aws_ebs_volume.create_volume: Still creating... (10s elapsed)
aws_ebs_volume.create_volume: Creation complete (ID: vol-04c7f4)
null_resource.stop_mysql_service2: Creating...
null_resource.stop_mysql_service2: Provisioning with 'remote-exec'...
null_resource.stop_mysql_service2 (remote-exec): Connecting to remote host via SSH...
null_resource.stop_mysql_service2 (remote-exec):   Host: mysql
null_resource.stop_mysql_service2 (remote-exec):   User: ubuntu
null_resource.stop_mysql_service2 (remote-exec):   Password: false
null_resource.stop_mysql_service2 (remote-exec):   Private key: true
null_resource.stop_mysql_service2 (remote-exec):   SSH Agent: true
null_resource.stop_mysql_service2 (remote-exec): Connected!
null_resource.stop_mysql_service2 (remote-exec): .
null_resource.stop_mysql_service2 (remote-exec): .
null_resource.stop_mysql_service2 (remote-exec): .
null_resource.stop_mysql_service2 (remote-exec): .
null_resource.stop_mysql_service2 (remote-exec): .
null_resource.stop_mysql_service2 (remote-exec): .
null_resource.stop_mysql_service2 (remote-exec): .
null_resource.stop_mysql_service2: Still creating... (10s elapsed)
null_resource.stop_mysql_service2 (remote-exec): .
null_resource.stop_mysql_service2 (remote-exec): .
null_resource.stop_mysql_service2 (remote-exec): .
null_resource.stop_mysql_service2 (remote-exec): .
null_resource.stop_mysql_service2 (remote-exec): .
null_resource.stop_mysql_service2 (remote-exec): .
null_resource.stop_mysql_service2 (remote-exec): .
null_resource.stop_mysql_service2 (remote-exec): .
null_resource.stop_mysql_service2 (remote-exec): .
null_resource.stop_mysql_service2 (remote-exec):  * Attempt to shutdown MySQL Community Server 5.6.35 timed out
null_resource.stop_mysql_service2: Still creating... (20s elapsed)
null_resource.stop_mysql_service2: Still creating... (30s elapsed)
null_resource.stop_mysql_service2: Creation complete (ID: 1850529311883)
aws_volume_attachment.mysql_data: Creating...
  device_name:  "" => "/dev/xvdf"
  force_detach: "" => "true"
  instance_id:  "" => "i-0d48be4266da"
  skip_destroy: "" => "true"
  volume_id:    "" => "vol-04c7f4"
aws_volume_attachment.mysql_data: Still creating... (10s elapsed)
Error applying plan:

1 error(s) occurred:

* aws_volume_attachment.mysql_data: 1 error(s) occurred:

* aws_volume_attachment.mysql_data: [WARN] Error attaching volume (vol-04c7f4) to instance (i-0d48be4266da),
message: "Invalid value '/dev/xvdf' for unixDevice. Attachment point /dev/xvdf is already in use", code: "InvalidParameterValue"

Terraform does not automatically rollback in the face of errors.
Instead, your Terraform state file has been partially updated with
any resources that successfully completed. Please address the error
above and apply again to incrementally change your infrastructure.