cluster: v0.11.13, cluster crashed in windows 2008r2 running on VMWare.

[missing1984]

var cluster = require('cluster');
var http = require('http');
var numCPUs = 1;

if (cluster.isMaster) {
    // Fork workers.
    console.log("size=" + numCPUs);
    for (var i = 0; i < numCPUs; i++) {
        cluster.fork();
    }

    console.log('master ' + process.pid + ' online');
    cluster.on('online', function(worker) {
        console.log('worker ' + worker.process.pid + ' online');
    });
    cluster.on('exit', function(worker, code, signal) {
        console.log('worker ' + worker.process.pid + ' died');
    });

} else {
    // Workers can share any TCP connection
    // In this case its a HTTP server
    http.createServer(function(req, res) {
        //process.send("pingfrom" + process.pid);
        res.writeHead(200);
        res.end("hello world\n");
    }).listen(8000);
}

cluster was started successfully with one worker

size=1
master 2088 online
worker 820 online

However, once i visit http://localhost:8000, the cluster crashed with following error.

Assertion failed: cb->IsFunction(), file g:\jenkins\workspace\nodejs-msi\22874dd8\src\async-wrap-inl.h, line 230

My system info,

Host Name:                 WIN-GGOAQOAG30L
OS Name:                   Microsoft Windows Server 2008 R2 Enterprise
OS Version:                6.1.7601 Service Pack 1 Build 7601
OS Manufacturer:           Microsoft Corporation
OS Configuration:          Standalone Server
OS Build Type:             Multiprocessor Free
Registered Owner:          Windows User
Registered Organization:
Product ID:                00486-001-0001076-84452
Original Install Date:     4/12/2014, 6:01:43 PM
System Boot Time:          5/22/2014, 4:53:41 PM
System Manufacturer:       VMware, Inc.
System Model:              VMware Virtual Platform
System Type:               x64-based PC
Processor(s):              1 Processor(s) Installed.
                           [01]: Intel64 Family 6 Model 70 Stepping 1 GenuineIntel ~2294 Mhz
BIOS Version:              Phoenix Technologies LTD 6.00, 7/31/2013
Windows Directory:         C:\Windows
System Directory:          C:\Windows\system32
Boot Device:               \Device\HarddiskVolume1
System Locale:             en-us;English (United States)
Input Locale:              en-us;English (United States)
Time Zone:                 (UTC-08:00) Pacific Time (US & Canada)
Total Physical Memory:     2,047 MB
Available Physical Memory: 853 MB
Virtual Memory: Max Size:  4,095 MB
Virtual Memory: Available: 2,773 MB
Virtual Memory: In Use:    1,322 MB
Page File Location(s):     C:\pagefile.sys
Domain:                    WORKGROUP
Logon Server:              \\WIN-GGOAQOAG30L
Hotfix(s):                 1 Hotfix(s) Installed.
                           [01]: KB976902
Network Card(s):           1 NIC(s) Installed.
                           [01]: Intel(R) PRO/1000 MT Network Connection
                                 Connection Name: Local Area Connection
                                 DHCP Enabled:    Yes
                                 DHCP Server:     192.168.20.254
                                 IP address(es)
                                 [01]: 192.168.20.133
                                 [02]: fe80::7465:4c1f:4a1c:7479

1. once i increased the worker count >2, the issue gone.
2. the issue is not reproducible with v10.x node.
3. the issue is not reproducible if i start the server directly without cluster.