cluster: Can't passing http server to worker

[ponury-kostek]

• Version: v8.5.0
• Platform: Linux michal-KU-7693 4.10.0-35-generic Gitter chat room? #39-Ubuntu SMP Wed Sep 13 07:46:59 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
• Subsystem: cluster

Passing http server instance to worker not working anymore on node v8.5.0, but works on v6.11.3
main.js

"use strict";
const cluster = require('cluster');
if (cluster.isMaster) {
	cluster.setupMaster({exec : __dirname + '/subprocess.js'});
	const subprocess = cluster.fork();
	const server = require('http').createServer();

	server.listen(1337, () => {
		subprocess.send('server', server);
	});
}

subprocess.js

"use strict";
process.on('message', (m, server) => {
	console.log(m, server);
});

net.js:1490
throw new Error('Invalid listen argument: ' + util.inspect(options));
^

Error: Invalid listen argument: { port: null }
at Server.listen (net.js:1490:9)
at new RoundRobinHandle (internal/cluster/round_robin_handle.js:23:17)
at queryServer (internal/cluster/master.js:288:29)
at Worker.onmessage (internal/cluster/master.js:244:5)
at ChildProcess.onInternalMessage (internal/cluster/utils.js:42:8)
at emitTwo (events.js:130:20)
at ChildProcess.emit (events.js:213:7)
at emit (internal/child_process.js:774:12)
at _combinedTickCallback (internal/process/next_tick.js:141:11)
at process._tickCallback (internal/process/next_tick.js:180:9)

[cjihrig]

This looks like it may be #14205. If so, there is a fix in #14221.

[ponury-kostek]

I don't think it's net related because it works if child_process used instead

"use strict";
const child_process = require('child_process');
const subprocess = child_process.fork(__dirname + '/subprocess.js');
const server = require('http').createServer();
server.listen(1337, () => {
	subprocess.send('server', server);
});

and this work as expected

[cjihrig]

I can reproduce the issue with 8.5.0 and master. After applying the changes in #14221, your provided code runs again.

EDIT: It's also worth mentioning that you're sending an HTTP server to the child process. That will come through on the child side as a net server, not HTTP server.

[ponury-kostek]

It works in 8.6.0 so I'm closing this