terraform-provider-aws: Cannot delete launch configuration because it is attached to AutoScalingGroup

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Terraform Version

terraform -v
Terraform v0.11.13
+ provider.aws v2.7.0
+ provider.null v2.1.1
+ provider.random v2.1.1

Affected Resource(s)

• aws_autoscaling_group
• aws_launch_configuration

Terraform Configuration Files

directory layout

.
├── main.tf
├── modules
│   ├── app
│   └── terraform-aws-autoscaling

modules/app/main.tf

variable "private_subnets" {
  type    = "list"
}

variable "name" {}
variable "userdata" {}

module "app_asg" {
  source = "../terraform-aws-autoscaling"

  name          = "${var.name}"
  lc_name       = "${var.name}"
  asg_name      = "${var.name}"
  image_id      = "ami-0e219142c0bee4a6e"
  instance_type = "t2.micro"

  root_block_device = [
    {
      volume_size           = "10"
      volume_type           = "gp2"
      delete_on_termination = true
    },
  ]

  user_data                    = "${var.userdata}"
  vpc_zone_identifier          = ["${var.private_subnets}"]
  health_check_type            = "EC2"
  min_size                     = 1
  max_size                     = 1
  desired_capacity             = 1
  wait_for_capacity_timeout    = 0
  recreate_asg_when_lc_changes = true
}

main.tf

First apply with this configuration:

provider "aws" {
  region = "eu-west-1"
}

module "app-001" {
  source   = "modules/app"
  name     = "app-001"
  userdata = "echo hello there version 1"
}

Second apply with this configuration:

provider "aws" {
  region = "eu-west-1"
}

module "app-001" {
  source   = "modules/app"
  name     = "app-001"
  userdata = "echo hello there version 2" ## <- just changed this
}

Third apply with this configuration:

provider "aws" {
  region = "eu-west-1"
}

# module "app-001" {
#   source   = "modules/app"
#   name     = "app-001"
#   userdata = "echo hello there version 2" ## <- just changed this
# }

Debug Output

• https://gist.github.com/jvelasquezjs/31b9ca05aebb3a2ec78812b40e19f218

Panic Output

No

Expected Behavior

Terraform to apply the configuration and delete the commented out resources successfully.

Actual Behavior

Got an error:

module.app-001.app_asg.aws_autoscaling_group.this: Still destroying... (ID: app-001-tight-bengal-20190430102834949100000002, 1m0s elapsed)
module.app-001.app_asg.aws_autoscaling_group.this: Still destroying... (ID: app-001-tight-bengal-20190430102834949100000002, 1m10s elapsed)
module.app-001.module.app_asg.aws_autoscaling_group.this: Destruction complete after 1m15s

Error: Error applying plan:

1 error(s) occurred:

* module.app-001.module.app_asg.aws_launch_configuration.this (destroy): 1 error(s) occurred:

* aws_launch_configuration.this: error deleting Autoscaling Launch Configuration (app-001-20190430102834111500000001): ResourceInUse: Cannot delete launch configuration app-001-20190430102834111500000001 because it is attached to AutoScalingGroup app-001-tight-bengal-20190430102834949100000002
	status code: 400, request id: 2f89b9c4-6b33-11e9-8d9d-711c4d69f590

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.

Steps to Reproduce

1. terraform apply
2. change configuration as stated above
3. terraform apply
4. change configuration as stated above, so we delete the module
5. terraform apply

Important Factoids

References

Opening a new issue, as the original one was closed.

• #646