NodeJS process with WebMIDI crashes upon closing Max 8, if Max was started before starting the NodeJS process

[nnirror]

Description

My nodeJS process crashes when I include WebMIDI, under the following circumstance:

I first open Max 8, then start a nodeJS process, and then close Max.

Environment:
Specify the environment where you are witnessing the problem:

• webmidi 3.1.6 for NodeJS
• NodeJS v14.20.0
• JavaScript
• MacOS Catalina

Details

Here's the contents of a nodeJS process that's crashing on my machine. This test.js file contains only:

const {WebMidi} = require('webmidi');
WebMidi.enable();

Steps to reproduce:

1. open Max 8.
2. start the node process: node test.js
3. close Max 8.

I see the following error in the console, and I see that the nodeJS process thread has terminated.

Segmentation fault: 11

I checked that the same workflow does not cause a crash with Ableton Live 11.

[djipco]

WEBMIDI.js uses the jzz package under the hood for MIDI communication on Node.js. Could you install the module and try this basic example to see if you get the same problem:

const navigator = require('jzz'); 

navigator.requestMIDIAccess({sysex: true}).then((access)=>{
  console.log(Array.from(access.inputs.values()), Array.from(access.outputs.values())); 
}, (err)=>{console.log(err)});

Thanks!

P.S. It might be related to this: jazz-soft/JZZ#49 (follow-up here: jazz-soft/jazz-midi#5)

[nnirror]

@djipco Yes, I do get the exact same error in a test npm project that only has jzz 1.7.4 installed. When I open Max, start the Node process, and then close Max, I get Segmentation fault: 11.

[djipco]

Thanks for reporting back. It is quite clear now that the issue is with the jazz-midi module. I have notified the jazz-midi team of the problem. We will have to wait for them for a resolution.