co: Aggressive Memory Leak

I’ve been able to narrow down an aggressive memory leak I’m experiencing to this:

Run with: node --harmony --expose-gc filename.js

var co = require('co');

function* sleep() {
    return new Promise(function(resolve) {
        setTimeout(resolve, 1);
    });
};

co(function*() {

    for(var i = 0; true; ++i) {
        yield sleep();

        if (i % 10000 === 0) {
            global.gc();
            console.log(process.memoryUsage());
        }

    }

}).then(function() {
    console.log('finished')
}, function(err) {
    console.log('caught error: ', err.stack);
});

Sample output:

{ rss: 17420288, heapTotal: 9620736, heapUsed: 3590768 }
{ rss: 44822528, heapTotal: 49288192, heapUsed: 12972200 }
{ rss: 70955008, heapTotal: 58575616, heapUsed: 21688912 }
{ rss: 80048128, heapTotal: 66831104, heapUsed: 30531560 }
{ rss: 89157632, heapTotal: 76118528, heapUsed: 39490184 }
{ rss: 98275328, heapTotal: 85405952, heapUsed: 48445040 }
{ rss: 107368448, heapTotal: 93661440, heapUsed: 57410024 }
{ rss: 116477952, heapTotal: 102948864, heapUsed: 66365712 }
{ rss: 125591552, heapTotal: 112236288, heapUsed: 75330040 }
{ rss: 134684672, heapTotal: 120491776, heapUsed: 84285144 }
{ rss: 143798272, heapTotal: 129779200, heapUsed: 93250072 }
{ rss: 152907776, heapTotal: 139066624, heapUsed: 102205152 }
{ rss: 162000896, heapTotal: 147322112, heapUsed: 111170352 }
{ rss: 171114496, heapTotal: 156609536, heapUsed: 120125032 }