'"Workerpool Worker terminated Unexpectedly" for Mocha tests in CircleCI

I have TypeScript tests running with Yarn and Mocha and they work fine locally. When I deploy via CircleCI, however, I get this:

1) Uncaught error outside test suite:
   Uncaught Workerpool Worker terminated Unexpectedly
  exitCode: `null`
  signalCode: `SIGKILL`
  workerpool.script: `/home/circleci/my-project/node_modules/mocha/lib/nodejs/worker.js`
  spawnArgs: `/usr/local/bin/node,--inspect,--inspect=43215,/home/circleci/my-project/node_modules/mocha/lib/nodejs/worker.js`
  spawnfile: `/usr/local/bin/node`
  stdout: `null`
  stderr: `null`

Error: Workerpool Worker terminated Unexpectedly
    exitCode: `null`
    signalCode: `SIGKILL`
    spawnfile: `/usr/local/bin/node`
    stdout: `null`
    stderr: `null`
  
    at ChildProcess.<anonymous> (node_modules/workerpool/src/WorkerHandler.js:294:13)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:282:12)

And here's my CircleCI config. I've edited a few fields specific to my project and removed some sections that are moot here, as they're for jobs I can't currently run because they're later on in the process.

version: 2.1

orbs:
  aws-cli: circleci/[email protected]
  assume-role: airswap/[email protected]

docker_base: &docker_base
  working_directory: ~/my-funnel  # Edited for privacy
  docker:
    - image: cimg/node:14.18.0
    - image: cimg/openjdk:17.0.1
    - image: amazon/dynamodb-local:1.17.1
      command: -Djava.library.path=./DynamoDBLocal_lib -jar DynamoDBLocal.jar -inMemory -sharedDb
    - image: roribio16/alpine-sqs:1.2.0

jobs:
  build_and_test:
    <<: *docker_base
    environment:
      APP_ENV: test
      IS_CI: "true"
      # This ID remains here even though I have the Code Climate reporter stuff disabled for now
      CC_TEST_REPORTER_ID: mytestreporterid  # Hex value, redacted for privacy
    steps:
      - checkout
      - run: |
          sudo curl -L https://github.com/remind101/ssm-env/releases/download/v0.0.4/ssm-env -o /usr/local/bin/ssm-env && \
                cd /usr/local/bin && \
                echo 4a5140b04f8b3f84d16a93540daa7bbd ssm-env | md5sum -c && \
                sudo chmod +x ssm-env
      - restore_cache:
          name: Restore Yarn Package Cache
          keys:
            - yarn-packages-{{ checksum "yarn.lock" }}
      - run:
          name: Install Dependencies
          command: yarn install --frozen-lockfile
      - save_cache:
          name: Save Yarn Package Cache
          key: yarn-packages-{{ checksum "yarn.lock" }}
          paths:
            - ~/.cache/yarn
      - run: yarn run lint
      - run: yarn run test # This is where it gives me the Workerpool error
      - run: yarn run package
      - run:
          name: Run Fossa Checks
          command: ./run_fossa.sh

  # A deploy job is defined here, of course, but I'm not getting to the point where I can use it.

workflows:
  no_flow:
    jobs:
      - build_and_test:
          context:
            - fossa
      # There's more here that runs the deploy job; see above comment

I've xdescribed out all the tests and this still happens. Ideas appreciated.

UPDATE: I have this line in my run.ts file:

const tests = child_process.spawn(
    "APP_ENV=test NODE_ENV=test ssm-env --with-decryption node_modules/mocha/bin/mocha --inspect -r ts-node/register -r tsconfig-paths/register --recursive 'test/**/*.spec.ts' --parallel",
    { stdio: "inherit", cwd: "./", shell: true }
);

I removed that --parallel and now all is well. Still puzzled regarding the core issue, but at least this is a work-around.

Solution 1:^[1]

I have had the same problem.

The actual problem is running out of memory.

I have allocated much more memory. My problem is solved.

Sources

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Source: Stack Overflow

Solution	Source
Solution 1	Luoxinzheng

'"Workerpool Worker terminated Unexpectedly" for Mocha tests in CircleCI

Solution 1:[1]

Sources

Related Questions

Solution 1:^[1]