Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

I have created a setup that deploys the following infrastructure:
The bucket
The eventbridge rule
The lambda

"The lambda" uploads a random file to "The bucket" on a scheduled event "The eventbridge rule".

This works nicely as long as I do not configure on eventbridge events on the S3 bucket.

When configured on "The lambda" is triggered for every file uploaded - creating an endless loop. If I generate more than one file in the lambda I create a "fork bomb".

Expected Behavior

"The eventbridge rule" (schedule) triggers one execution of "The lambda" - and one object gets uploaded to "The bucket" then finishes.

There are no extra invocations of the lambda based on events from the bucket.

How are you starting LocalStack?

With a docker-compose file

Steps To Reproduce

How are you starting localstack (e.g., bin/localstack command, arguments, or docker-compose.yml)

docker run localstack/localstack

Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)

awslocal s3 mb s3://mybucket

Environment

- OS: macOS Monterrey version 12.6.1
- LocalStack: latest

Anything else?

I have added a tgz file here with a minimal example to re-create the bug.

In the tgz:
docker-compose.yml to spin up localstack and to spin up a docker container that builds the lambda and sets up the infrastructure using terraform.

Start it by running

docker compose up --build -d

To see the logs run

docker compose logs localstack -f

After ~1 minute the lambda will trigger, and sleep for 5 seconds, then it uploads a file with uuid as name and content to S3. When the upload completes there is an event on the eventbus, and even though there is no event rule to trigger a lambda execution the lambda is executed on this event.

This means that the lambda will execute every 5 seconds for a minute, then another scheduled event happens and another file is created meaning that two files will be created every 5 seconds. It is wise not to let this run for too long.

bug_exmple.tgz