Python debugger hangs when stepping through the code

Python debugger hangs when stepping through the code

This seems to be a duplicate of microsoft/vscode-python#3342

Environment data

• VS Code version: 1.44.1
• Extension version (available under the Extensions sidebar): 2020.3.71659
• OS and version: macOS Mojave 10.14.6
• Python version (& distribution if applicable, e.g. Anaconda): 3.7.7, installed through Homebrew
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): N/A
• Relevant/affected Python packages and their versions: N/A
• Relevant/affected Python-related VS Code extensions and their versions: Python extension
• Jedi or Language Server? (i.e. what is "python.jediEnabled" set to; more info How to update the language server to the latest stable version vscode-python#3977): "Jedi Enabled" is marked in the settings
• Value of the python.languageServer setting: Microsoft or Jedi (reproducible in both cases)

Expected behaviour

The debugger allows to step through the Python code

Actual behaviour

Python debugger hangs on random lines of code.

Steps to reproduce:

It seems to reproduce on any code, just by stepping through the code. E.g. this trivial script does get stuck when stepping with the debugger:

#!/usr/bin/env python

def gcd(a, b):
    print("gcd(%s, %s)" % (a, b))
    if b == 0: 
        return a
    return gcd(b, a % b)

print(gcd(6, 9))
print(gcd(9, 6))

Logs

There's nothing in the Output panel.

I found that this happens only when I have some expressions in the "WATCH" list. I can't reproduce it with the empty watch list. It is reproducible with the expression list below. All expressions are invalid as there are no such variables in the script that's being debugged.

1. values
2. [x for x in filter(lambda x: x>0, values)]
3. self.id

[eager-seeker]

Also getting this. Definitely relates to adding watches. 1 or 2 can be added without problems, but then a 3rd doesn't appear and step debugger won't continue.
MacOS: 10.14.6
VS Code 1.44.2.
conda 4.8.3
Extensions:

formulahendry.dotnet-test-explorer@0.7.1
James-Yu.latex-workshop@8.8.0
janisdd.vscode-edit-csv@0.2.6
k--kato.docomment@0.1.9
ms-dotnettools.csharp@1.21.17
ms-mssql.mssql@1.9.0
ms-python.anaconda-extension-pack@1.0.1
ms-python.python@2020.3.71659
redhat.vscode-yaml@0.7.2
streetsidesoftware.code-spell-checker@1.8.0
tecosaur.latex-utilities@0.3.6

[int19h]

The symptoms match #108 perfectly. We have a fix for that in the insiders version of the extension - please give that a try, and let me know if that helps.

@int19h, thanks, the workaround mentioned in #108 did help.