Server.getConnections() failed with "Slave closed before reply"

[kavinwang]

node version : 4.x - 6.x
os: macos linux

save the following codes to a file like 'server.js', and run node server.js
then run this test code in another console:

for i in {1..1500}; do curl http://localhost:12345; sleep 1; echo "---- $i\n"; done

server.js :

'use strict';
var cluster = require('cluster');
var net = require('net');
if (cluster.isMaster) {
    console.log('Nodejs version :', process.version);
    var cpuCount = require('os').cpus().length;
    var workers = [];

    var spawn = function(workerIndex) {
        var worker = cluster.fork();
        workers[workerIndex] = worker;
        worker.on('exit', function() {
            spawn(workerIndex);
        });
    };
    for (var i = 0; i < cpuCount; i++) spawn(i);

    var masterHttpServer = net.createServer({ pauseOnConnect: true }, function(socket) {
        //var worker = workers[Number('0' + socket.remoteAddress.replace(/[abcdef:.]/g, '')) % cpuCount];
        var worker = workers[0];
        worker.send('xxx-http-session:connection', socket);
    }).listen(12345);

    setInterval(function() {
        //XXX: will return errors if some worker dies with unclosed socket
        masterHttpServer.getConnections(function(err, counts) {
            if (!err) console.info('active connections : ' + counts);
            else console.info('errors ocurred when getConnections ：' + err);
        });
    }, 1000);

    setInterval(function() {
       workers[0].kill();
    }, 1000);

} else {
    var server = require('http').createServer(function(req, res) {
        res.end('Anythings returns to the browser! ');
    });

    process.on('message', function(message, socket) {
        if (message !== 'xxx-http-session:connection') return;
        server.emit('connection', socket);
        socket.resume();
    });
}

process.on('uncaughtException', function(err) {
    console.log('uncaughtException:', err.stack);
});
process.on('exit', function(code) {
    console.warn('process is down ! exit code :', code);
});

Server.getConnections() will fail with "Slave closed before reply"; and will nerver come back !

output:

Nodejs version : v6.11.0
active connections : 0
errors ocurred when getConnections ：Error: Slave closed before reply
errors ocurred when getConnections ：Error: Slave closed before reply
errors ocurred when getConnections ：Error: Slave closed before reply
errors ocurred when getConnections ：Error: Slave closed before reply
errors ocurred when getConnections ：Error: Slave closed before reply
errors ocurred when getConnections ：Error: Slave closed before reply
errors ocurred when getConnections ：Error: Slave closed before reply

I think that is a bug !
thanks!

[XadillaX]

Can you minify your code to reproduce this problem?

[apapirovski]

Given the lack of a follow up and no one taking this up, I'm going to go ahead and close. If anyone happens to have any additional information or believes this should remain open, please feel free to do so. Just cleaning up the issue tracker a tad...