"Segmentation fault" in worker thread on ubuntu

[ThisNils]

When running the library inside a worker thread on ubuntu (I had no problems running the exact same code on windows, same library and nodejs version), the program exits with the message "Segmentation fault". The image gets rendered and transferred to the main thread correctly, but as soon as the worker exits, the main thread will terminate too.

Example code:

// index.js
const { Worker } = require('worker_threads');
const { promises: fs } = require('fs');

const worker = new Worker('./worker.js');
worker.on('message', async (m) => {
  await fs.writeFile('./out.png', m);
});

// worker.js
const { parentPort } = require('worker_threads');
const { createCanvas } = require('@napi-rs/canvas');

const canvas = createCanvas(1000, 1000);
const ctx = canvas.getContext('2d');

ctx.fillStyle = 'black';
ctx.fillRect(0, 0, canvas.width, canvas.height);

const pngBuffer = canvas.toBuffer('image/png');
parentPort.postMessage(pngBuffer);

Output:

# node index.js
Segmentation fault

Versions:
NodeJS: v16.11.1
@napi-rs/canvas: 0.1.13
Ubuntu: 18.04.5 LTS

[Brooooooklyn]

I'll dig into this problem. BTW, you don't need run @napi-rs/canvas in worker_thread, it provides non-blocking API which is running in libuv thread.

[rambo-panda]

I also have this problem。When I terminate a worker, I will start this error

[Brooooooklyn]

@rambo-panda what's your Node.js version, crash on Node@12 is a known issue nodejs/node#42376

[Brooooooklyn]

Please don't use @napi-rs/canvas in worker_thread since @napi-rs/canvas already has the no-blocking API, which will schedule the tasks to cross threads:

Promise.all([
  canvas.encode('png'),
  canvas.encode('webp'),
  canvas.encode('jpg'),
  canvas.encode('avif'),
])

The code snippets will start 4 threads and resolve the result when the task is completed.

[rambo-panda]

@Brooooooklyn

  {
  node: '14.15.4',
  v8: '8.4.371.19-node.17',
  uv: '1.40.0',
  zlib: '1.2.11',
  brotli: '1.0.9',
  ares: '1.16.1',
  modules: '83',
  nghttp2: '1.41.0',
  napi: '7',
  llhttp: '2.1.3',
  openssl: '1.1.1i',
  cldr: '37.0',
  icu: '67.1',
  tz: '2020a',
  unicode: '13.0'
}