Change:
private isDebuggable(cmd: string): boolean { const matches = DEBUG_FLAGS_PATTERN.exec(cmd); <del> return (matches && matches.length >= 2) || cmd.indexOf('node ') >= 0 || cmd.indexOf('node.exe') >= 0; </del> <ins> return (matches && matches.groups!.port !== '0') || cmd.indexOf('node ') >= 0 || cmd.indexOf('node.exe') >= 0; </ins> } private attachTo(item: ProcessItem) {

Discussion:
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I don't see this 'debug' option, and it seems a little suspicious to me, do you know about this
doesn't work for extension host for me, but it does for other node processes: !
Useful code pointer: Maybe to
I didn't know this was a thing, but can give it a poke...
Searching through the sources, I'm not sure what the process is. I don't see a string with such casing in our source, and I don't reproduce this when running on Linux. Similar to Rob's screenshot I only see an which has no Debug option. it sounds like you were able to hit this... what environment were you running in, and could you get the command line of whatever process ID is for you?
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I didn't try repro, just showed the debug button.
given you can still reproduce this, please run , where is the PID in the right hand column of the process.

That should give us some hints on what it is/how it's getting spawned.
Sure, this is the output of :
ah, I was able to reproduce by using Remote SSH to connect to a Linux machine. But then debugging worked (well, I could connect, but as soon as the debugger pauses the ext host just deadlocks since the extension that handles debugging is the extension that's running in the process which is paused.) did you install VS Code from snap, perchance?
Yes, I used to install VS Code.
Verification: there should no longer be a Debug option in the context menu if is present in the command line (since we don't know what port to connect to)
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