Memory usage increases seemingly without bound.

memory-leak-repro.js

function allocateMemory(len) {
        var s = "";

        for (var i = 0; i < len; i++) {
                s += "x";
        }

        return s.length;
}

var Threads = require('webworker-threads');

var t = Threads.createPool(2);

t.all.eval(allocateMemory);

function runI(i) {
        t.any.eval('allocateMemory(' + i + ')', function (err, result) {
                if (err) {
                  console.error(err.message);
                } else if (result && (result % 1000) === 0) {
                  console.log('result ' + result);
                }
        });
}

setInterval(function(){
        console.log("still alive");
        console.log("process.memoryUsage: " + JSON.stringify(process.memoryUsage()));
}, 5000);

for (var i = 0; i < 1000000; i++) {
        runI(i);
}