build process hang with less(on AWS EC2)

[boaz-hwang]

t# Bug report

Describe the bug

on EC2, clone this repo
yarn install
yarn build
then, stop build process and no any logs

but on local,
yarn build success

so I try dockerizing for building but get same trouble
(stop build process)

Expected behavior

next build done

Screenshots

Code snipets(next.config.js)

const withLess = require('@zeit/next-less');
const withCss = require('@zeit/next-css');
const lessToJS = require('less-vars-to-js');
const fs = require('fs');
const path = require('path');

// Where your antd-custom.less file lives
const themeVariables = lessToJS(
    fs.readFileSync(path.resolve(__dirname, './assets/antd-custom.less'), 'utf8')
);

module.exports = withCss(
    withLess({
        env: {
            BASE_URL: 'http://localhost:3000/api',
        },
        lessLoaderOptions: {
            javascriptEnabled: true,
            modifyVars: themeVariables,
        },
        webpack: (config, { isServer }) => {
            if (isServer) {
                const antStyles = /antd\/.*?\/style.*?/;
                const origExternals = [...config.externals];
                config.externals = [
                    (context, request, callback) => {
                        if (request.match(antStyles)) return callback();
                        if (typeof origExternals[0] === 'function') {
                            origExternals[0](context, request, callback);
                        } else {
                            callback();
                        }
                    },
                    ...(typeof origExternals[0] === 'function' ? [] : origExternals),
                ];
                config.module.rules.unshift({
                    test: antStyles,
                    use: 'null-loader',
                });
            }
            return config;
        },
    })
);

System information

• OS: [e.g. macOS, Windows] ubuntu 18.04(EC2, local same)
• Browser (if applies) [e.g. chrome, safari] chrome
• Version of Next.js: [e.g. 6.0.2] 9.4.4(latest)
• Version of Node.js: [e.g. 10.10.0] on EC2: 10.21.0, local: 10.16.0

Additional context

please check code by cloning my github repository

and testing for solving this issue

thanks