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You'll need to see what is currently using the security group that is blocking it from being deleted.

It's likely an ENI that is lingering around.

If you're able to reproduce that, please open an issue at <http://github.com/pulumi/pulumi-eks|github.com/pulumi/pulumi-eks>

Once you've figured out the problem and reported it, you can get your stack working again by manually removing the resource via the console. You may also have to remove it from state; `pulumi state delete &lt;urn&gt;` should do that for you.

If that doesn't work, unfortunately you have to export the stack, delete the pending operation, and import the stack.