build error or build hang with libuv 1.46

[JohnKoutsoumpas]

• Operating System: Arch Linux 6.4.4-arch1-1
• Node Version: 16.20.1
• NPM Version: 9.8.1
• webpack Version: 5.88.2
• thread-loader Version: 4.0.2
• libuv Version: 1.46

Expected Behavior

Webpack build builds successfully

Actual Behavior

Webpack build either hangs indifinetely or fails with the following 2 errors:

1. JSON Parse failed unexpected token at random, each time, positions
2. Error EPIPE

Code

// package.json
{
  "name": "libuv-error-webpack",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "thread-loader": "^4.0.2",
    "webpack": "^5.88.2"
  },
  "devDependencies": {
    "ts-loader": "^9.4.4",
    "typescript": "^5.1.6",
    "webpack-cli": "^5.1.4"
  }
}

// webpack.config.js
const path = require('path');

module.exports = {
  mode: "development",
  entry: './src/index.ts',
  devtool: 'inline-source-map',
  module: {
    rules: [
      {
        test: /\.tsx?$/,
        use: [
          {
            loader: 'thread-loader',
          },
          {
            loader: 'ts-loader',
            options: {
              happyPackMode: true,
              experimentalWatchApi: true,
              experimentalFileCaching: true,
            }
          }
        ],
        exclude: /node_modules/,
      },
    ],
  },
  resolve: {
    extensions: ['.tsx', '.ts', '.js'],
  },
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'dist'),
  },
};

// tsconfig.json
{
  "compilerOptions": {
    "outDir": "./dist/",
    "sourceMap": true,
    "noImplicitAny": true,
    "module": "commonjs",
    "target": "es5",
    "jsx": "react",
    "allowJs": true,
    "moduleResolution": "node",
  }
}

// src/index.ts
import {component1} from './test1'
import {component2} from './test2'
import {component3} from './test3'

component1()

src/test1.ts https://gist.github.com/JohnKoutsoumpas/de5b6f893f558c13dbd5b395b349b3c1 src/test2.ts https://gist.github.com/JohnKoutsoumpas/1f7bae8f832198a25e5dd4f28420307f src/test3.ts https://gist.github.com/JohnKoutsoumpas/93a20cd27063bdce1a0fc53498fc4908

How Do We Reproduce?

create all the above files in an new empty dir, run npm i and then run node ./node_modules/webpack/bin/webpack.js and it will hang indefinitely (with libuv 1.46 installed). With libuv 1.44 it builds fine.

I filed a relevant issue with libuv too, they told me that this is a problem with the application (thread-loader).

[av]

Node.js released v18.18.0 where they switch to libuv 1.46, we also experienced an issue where jobs running thread-loader are hanging indefinitely or throw a JSON parse error.

[slt]

We were getting this on v18.18.0 and have rolled back to v18.17.1 for now

#26 6.723 SyntaxError: Unexpected token  in JSON at position 56
#26 6.723     at JSON.parse (<anonymous>)
#26 6.723     at /www/sites/base_web/node_modules/thread-loader/dist/WorkerPool.js:122:30
#26 6.723     at Socket.onChunk (/www/sites/base_web/node_modules/thread-loader/dist/readBuffer.js:32:9)
#26 6.723     at Socket.emit (node:events:517:28)
#26 6.723     at addChunk (node:internal/streams/readable:335:12)
#26 6.723     at readableAddChunk (node:internal/streams/readable:308:9)
#26 6.723     at Readable.push (node:internal/streams/readable:245:10)
#26 6.723     at Pipe.onStreamRead (node:internal/stream_base_commons:190:23)
#26 6.723 
#26 6.723 Node.js v18.18.0

[maman]

disable IO_URING usage in libuv by adding UV_USE_IO_URING=0 when running webpack build command solves the hang for me - I'm using node 18.18.0, which uses libuv 1.46.