write EINVAL "Unhandled 'error' event" on Windows 10 with Node 7.1.0

[DeividasK]

Hello all,

New to mocha here. I have npm install mocha --save-dev. I have a folder named test with an empty file messages.js. If I run mocha, I get the following error:

Mocha 3.1.2

events.js:160
      throw er; // Unhandled 'error' event
      ^

Error: write EINVAL
    at exports._errnoException (util.js:1022:11)
    at WriteStream.Socket._writeGeneric (net.js:715:26)
    at WriteStream.Socket._write (net.js:734:8)
    at doWrite (_stream_writable.js:334:12)
    at writeOrBuffer (_stream_writable.js:320:5)
    at WriteStream.Writable.write (_stream_writable.js:247:11)
    at WriteStream.Socket.write (net.js:661:40)
    at c:\leoboto\node_modules\mocha\bin\_mocha:483:12
    at Array.forEach (native)
    at exit (c:\leoboto\node_modules\mocha\bin\_mocha:480:11)
    at done (c:\leoboto\node_modules\mocha\lib\mocha.js:517:13)
    at Runner.<anonymous> (c:\leoboto\node_modules\mocha\lib\runner.js:826:5)
    at emitNone (events.js:91:20)
    at Runner.emit (events.js:185:7)
    at c:\leoboto\node_modules\mocha\lib\runner.js:813:12
    at Runner.runSuite (c:\leoboto\node_modules\mocha\lib\runner.js:606:12)
    at start (c:\leoboto\node_modules\mocha\lib\runner.js:811:10)
    at Runner.run (c:\leoboto\node_modules\mocha\lib\runner.js:838:5)
    at Mocha.run (c:\leoboto\node_modules\mocha\lib\mocha.js:521:17)
    at Object.<anonymous> (c:\leoboto\node_modules\mocha\bin\_mocha:458:18)
    at Module._compile (module.js:573:32)
    at Object.Module._extensions..js (module.js:582:10)
    at Module.load (module.js:490:32)
    at tryModuleLoad (module.js:449:12)
    at Function.Module._load (module.js:441:3)
    at Module.runMain (module.js:607:10)
    at run (bootstrap_node.js:420:7)
    at startup (bootstrap_node.js:139:9)
    at bootstrap_node.js:535:3
npm ERR! Test failed.  See above for more details.

Mocha 2.5.3

events.js:160
      throw er; // Unhandled 'error' event
      ^

Error: write EINVAL
    at exports._errnoException (util.js:1022:11)
    at WriteStream.Socket._writeGeneric (net.js:715:26)
    at WriteStream.Socket._write (net.js:734:8)
    at doWrite (_stream_writable.js:334:12)
    at writeOrBuffer (_stream_writable.js:320:5)
    at WriteStream.Writable.write (_stream_writable.js:247:11)
    at WriteStream.Socket.write (net.js:661:40)
    at c:\leoboto\node_modules\mocha\bin\_mocha:426:12
    at Array.forEach (native)
    at exit (c:\leoboto\node_modules\mocha\bin\_mocha:423:11)
    at done (c:\leoboto\node_modules\mocha\lib\mocha.js:498:13)
    at Runner.<anonymous> (c:\leoboto\node_modules\mocha\lib\runner.js:799:5)
    at emitNone (events.js:91:20)
    at Runner.emit (events.js:185:7)
    at c:\leoboto\node_modules\mocha\lib\runner.js:786:12
    at Runner.runSuite (c:\leoboto\node_modules\mocha\lib\runner.js:584:12)
    at start (c:\leoboto\node_modules\mocha\lib\runner.js:784:10)
    at Runner.run (c:\leoboto\node_modules\mocha\lib\runner.js:811:5)
    at Mocha.run (c:\leoboto\node_modules\mocha\lib\mocha.js:502:17)
    at Object.<anonymous> (c:\leoboto\node_modules\mocha\bin\_mocha:404:18)
    at Module._compile (module.js:573:32)
    at Object.Module._extensions..js (module.js:582:10)
    at Module.load (module.js:490:32)
    at tryModuleLoad (module.js:449:12)
    at Function.Module._load (module.js:441:3)
    at Module.runMain (module.js:607:10)
    at run (bootstrap_node.js:420:7)
    at startup (bootstrap_node.js:139:9)
    at bootstrap_node.js:535:3
npm ERR! Test failed.  See above for more details.

Windows 10
Node v7.1.0

Any ideas what could be causing this?

[ScottFreeCode]

Hmm... So, this is an error calling process.stdout.write('', <callback>) or process.stderr.write('', <callback>). (Took me a moment to figure out the stack trace was from 2.5.3, but I found the code.) Are you piping or redirecting the output anywhere?

[DeividasK]

I'm not doing anything apart from the steps mentioned above - install mocha, create empty file, run mocha.

[DeividasK]

I realized, that the output in OP was from mocha 2.5.3. I have updated the OP with output from mocha 3.1.2.

[algv]

Have it error on Windows 10 with Node v7.1.0 (mocha 2.5.3/3.1.2)
But with node v.7.0.0 and older work nice!.

[algv]

This error in others projects
facebook/react-native#10824
electron/electron#7919

[mischah]

I filed an issue in the Node.js repo: nodejs/node#9542

Please head over there in case you have any additional (and useful) information to share.
Thanks

[DeividasK]

Reverting to LTS node version 6.9.1 solves the issue.

[ScottFreeCode]

Thanks everyone for being one step ahead on this!