Remote attach is very very buggy. Debug adapter crashes all the time

[DonJayamanne]

From @nojvek on March 14, 2017 0:8

Environment data

VS Code version: Version 1.10.2 (1.10.2)
Python Extension version: 0.5.9
Python Version: 2.7
OS and version: Mac OS Sierra

Expected behavior

Remote attach works like Chrome-Dev tools

Actual behavior

Python remote debugger connects with orange but crashes later

Steps to reproduce:

• Run attach scenario

Settings

Your launch.json (if dealing with debugger issues):

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Attach (Remote Debug)",
            "type": "python",
            "request": "attach",
            "localRoot": "${workspaceRoot}",
            "remoteRoot": "/home/noj/xyz",
            "port": 3333,
            "secret": "boo",
            "host": "localhost"
        }
    ]
}

Your settings.json:

Logs

Output from Python output panel
----------Generating Tags----------
ctags --options=/Users/nojvek/.vscode/extensions/donjayamanne.python-0.5.9/resources/ctagOptions --languages=Python --exclude=/site-packages/ -o /Users/nojvek/mp/analytics/.vscode/tags .
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ctags: illegal option -- -
usage: ctags [-BFadtuwvx] [-f tagsfile] file ...

Output from Console window (Help->Developer Tools menu)

workbench.main.js:142 TypeError: Cannot read property 'Threads' of undefined
    at PythonDebugger.threadsRequest (/Users/nojvek/.vscode/extensions/donjayamanne.python-0.6.0/out/client/debugger/Main.js:339:27)
    at PythonDebugger.DebugSession.dispatchRequest (/Users/nojvek/.vscode/extensions/donjayamanne.python-0.6.0/node_modules/vscode-debugadapter/lib/debugSession.js:427:22)
    at PythonDebugger.ProtocolServer._handleData (/Users/nojvek/.vscode/extensions/donjayamanne.python-0.6.0/node_modules/vscode-debugadapter/lib/protocol.js:104:38)
    at Socket.<anonymous> (/Users/nojvek/.vscode/extensions/donjayamanne.python-0.6.0/node_modules/vscode-debugadapter/lib/protocol.js:24:60)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at readableAddChunk (_stream_readable.js:176:18)
    at Socket.Readable.push (_stream_readable.js:134:10)
    at Pipe.onread (net.js:543:20): Error: TypeError: Cannot read property 'Threads' of undefined
    at PythonDebugger.threadsRequest (/Users/nojvek/.vscode/extensions/donjayamanne.python-0.6.0/out/client/debugger/Main.js:339:27)
    at PythonDebugger.DebugSession.dispatchRequest (/Users/nojvek/.vscode/extensions/donjayamanne.python-0.6.0/node_modules/vscode-debugadapter/lib/debugSession.js:427:22)
    at PythonDebugger.ProtocolServer._handleData (/Users/nojvek/.vscode/extensions/donjayamanne.python-0.6.0/node_modules/vscode-debugadapter/lib/protocol.js:104:38)
    at Socket.<anonymous> (/Users/nojvek/.vscode/extensions/donjayamanne.python-0.6.0/node_modules/vscode-debugadapter/lib/protocol.js:24:60)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at readableAddChunk (_stream_readable.js:176:18)
    at Socket.Readable.push (_stream_readable.js:134:10)
    at Pipe.onread (net.js:543:20)
    at file:////Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:95:13980
    at Object.v [as _notify] (file:////Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:32:11161)
    at Object.enter (file:////Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:32:14666)
    at _run (file:////Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:32:15987)
    at _error (file:////Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:32:15504)
    at file:////Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:88:1241
    at g.e.dispatch (file:////Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:88:2592)
    at g.e.handleData (file:////Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:88:2100)
    at Socket.<anonymous> (file:////Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:88:1101)
    at emitOne (events.js:96:13)

Copied from original issue: DonJayamanne/pythonVSCode#819

[DonJayamanne]

From @nojvek on March 14, 2017 0:17

I may know a thing or two about vscode debug adapters. I can definitely help get this issue fixed if someone is able to help me with the python side of things.

[DonJayamanne]

Have you tried this with a simple console application and attaching to a python application running in your locality machine first.

[DonJayamanne]

From @nojvek on March 14, 2017 16:55

I'll give that a shot. It seems threading might have to do something to do with it.

TypeError: Cannot read property 'Threads' of undefined. I was digging into the ptvsd code yest, is there a way for me to enable debugging on the tcp port that is exposed by the python app?

I need to first isolate that this is a client side issue on the debug adapter or an issue with debug server run by python. Is there any protocol documentation?

[DonJayamanne]

Unfortunately, the answer is no to all of them.

[DonJayamanne]

From @woutor on July 28, 2017 22:1

For those using Django, I also get the above exception, unless I provide the --nothreading argument to django manage.py.

python manage.py runserver 0.0.0.0:8000 --noreload --nothreading does the job

[DonJayamanne]

@nojvek please try the following suggestions:

• If debugging Django, then ensure --notreading options is used
• Ensure the PTVSD package is of version 3.0.0 (anything higher will not work)

[DonJayamanne]

From @nojvek on July 29, 2017 5:55

Will give it a shot. Thanks

On Fri, Jul 28, 2017 at 9:33 PM Don Jayamanne notifications@github.com
wrote:

@nojvek https://github.com/nojvek please try the following suggestions:

• If debugging Django, then ensure --notreading options is used
• Ensure the PTVSD package is of version 3.0.0 (anything higher will
  not work)

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[DonJayamanne]

From @jarshwah on August 2, 2017 13:8

I looked into getting this working a couple of months back but abandoned because of the bugginess. It was easier for me to just use ipdb which is unfortunate, because debugging is just about the only thing I prefer pycharm for.

Anyhow, what I found was that the --noreload and --nothreading options were necessary. I also added the import of ptvsd and the ptvsd.wait_for_attach() call into the manage.py file which seemed to work the most reliably.

Happy to assist where I can. Would anyone from the python tools for visual studio team be able to help here? Surely they've run into similar issues during the development of ptvsd.

[DonJayamanne]

From @caspar-1 on August 10, 2017 13:14

might be usefull if the Remote-Debuging wiki page clarified that PTVSD version must be 3.0.0