Hangs after scanning 19k files

[archupsg03]

My directory has 10k files, and am using the below code

var started = Date.now();
var cnt = 0;
var filewalker = require('filewalker');

var options = {
maxPending: -1,
maxAttempts: 3,
// attemptTimeout: 10000,
// recursive: true,
// matchRegExp: /.(log)$/,
// matchRegExp: /.(json)|(md)$/,
};

filewalker('/home/archupsg03/test_dir')
.on('file', function(p, s) {
cnt = cnt + 1;
console.log('%s', p);
console.log('%d', cnt)
})
.on('done', function() {
var duration = Date.now()-started;
console.log('%d ms', duration);
})
.walk();

Scan of directory hangs after 19k files.
OS - linux