Concourse stops jobs with error ProcessNotFoundError

[Kifah]

On many concourse pipelines, which run a docker build task, we get the error:

backend error: Exit status: 404, message: {"Type":"ProcessNotFoundError","Message":"unknown process: task","Handle":"","ProcessID":"task","Binary":""}

The snippet from the yml job responsible is the following:

      - task: build-task-image
        privileged: true
        config:
          platform: linux
          image_resource:
            type: registry-image
            source:
              repository: jprelph/oci-build-task
          inputs:
            - name: src-docker-repo
          outputs:
            # The oci-build-task outputs the built container image in a directory called image
            - name: image

          run:
            path: build

Has anyone faced a similar error? and if yes, what is the best workaround or better: solution for it?

[xtremerui]

The error itself means the process that run the tash step in a worker container is gone. It could be the container disappeared unexpected.

You will need to inspect the worker log to find out the reason by looking up the container handle when the task runs.