Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

Python Debugging failing

See original GitHub issue

Add breakpoint to a python test case or (in any python file)
Select debug test
Debugging fails with the following error
Tests run successfully without debugging

Debugging was working without any issues. Stopped working all of a sudden. The only thing that I had done was a Git merge. But it cannot be the issue as I tried to debug a completely different plain hello world Python file with the same issue. I did not add any extensions or in any way change the setup of VS Code.

The error in the Python Test Log Output window is: Error: TypeError: Cannot read property 'testsuites' of null

The traceback in the Debug Console is:

Traceback (most recent call last):
  File "/Users/ar/.pyenv/versions/3.8.10/lib/python3.8/runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/Users/ar/.pyenv/versions/3.8.10/lib/python3.8/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/Users/ar/.vscode/extensions/ms-python.python-2021.7.1053846006/pythonFiles/lib/python/debugpy/__main__.py", line 45, in <module>
    cli.main()
  File "/Users/ar/.vscode/extensions/ms-python.python-2021.7.1053846006/pythonFiles/lib/python/debugpy/../debugpy/server/cli.py", line 444, in main
    run()
  File "/Users/ar/.vscode/extensions/ms-python.python-2021.7.1053846006/pythonFiles/lib/python/debugpy/../debugpy/server/cli.py", line 267, in run_file
    start_debugging(target)
  File "/Users/ar/.vscode/extensions/ms-python.python-2021.7.1053846006/pythonFiles/lib/python/debugpy/../debugpy/server/cli.py", line 257, in start_debugging
    debugpy.connect(options.address, access_token=options.adapter_access_token)
  File "/Users/ar/.vscode/extensions/ms-python.python-2021.7.1053846006/pythonFiles/lib/python/debugpy/../debugpy/common/compat.py", line 208, in kwonly_f
    return f(*args, **kwargs)
  File "/Users/ar/.vscode/extensions/ms-python.python-2021.7.1053846006/pythonFiles/lib/python/debugpy/../debugpy/__init__.py", line 135, in connect
    return api.connect(address, access_token=access_token)
  File "/Users/ar/.vscode/extensions/ms-python.python-2021.7.1053846006/pythonFiles/lib/python/debugpy/../debugpy/server/api.py", line 143, in debug
    log.reraise_exception("{0}() failed:", func.__name__, level="info")
  File "/Users/ar/.vscode/extensions/ms-python.python-2021.7.1053846006/pythonFiles/lib/python/debugpy/../debugpy/server/api.py", line 141, in debug
    return func(address, settrace_kwargs, **kwargs)
  File "/Users/ar/.vscode/extensions/ms-python.python-2021.7.1053846006/pythonFiles/lib/python/debugpy/../debugpy/server/api.py", line 276, in connect
    _settrace(host=host, port=port, client_access_token=access_token, **settrace_kwargs)
  File "/Users/ar/.vscode/extensions/ms-python.python-2021.7.1053846006/pythonFiles/lib/python/debugpy/../debugpy/server/api.py", line 47, in _settrace
    return pydevd.settrace(*args, **kwargs)
  File "/Users/ar/.vscode/extensions/ms-python.python-2021.7.1053846006/pythonFiles/lib/python/debugpy/_vendored/pydevd/pydevd.py", line 2696, in settrace
    _locked_settrace(
  File "/Users/ar/.vscode/extensions/ms-python.python-2021.7.1053846006/pythonFiles/lib/python/debugpy/_vendored/pydevd/pydevd.py", line 2819, in _locked_settrace
    py_db.enable_tracing(py_db.trace_dispatch, apply_to_all_threads=True)
  File "/Users/ar/.vscode/extensions/ms-python.python-2021.7.1053846006/pythonFiles/lib/python/debugpy/_vendored/pydevd/pydevd.py", line 1039, in enable_tracing
    pydevd_tracing.SetTrace(thread_trace_func)
  File "/Users/ar/.vscode/extensions/ms-python.python-2021.7.1053846006/pythonFiles/lib/python/debugpy/_vendored/pydevd/pydevd_tracing.py", line 83, in SetTrace
    if set_trace_to_threads(tracing_func, thread_idents=[thread.get_ident()], create_dummy_thread=False) == 0:
  File "/Users/ar/.vscode/extensions/ms-python.python-2021.7.1053846006/pythonFiles/lib/python/debugpy/_vendored/pydevd/pydevd_tracing.py", line 349, in set_trace_to_threads
    result = lib.AttachDebuggerTracing(
  File "/Users/ar/.pyenv/versions/3.8.10/lib/python3.8/ctypes/__init__.py", line 386, in __getattr__
    func = self.__getitem__(name)
  File "/Users/ar/.pyenv/versions/3.8.10/lib/python3.8/ctypes/__init__.py", line 391, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: dlsym(RTLD_DEFAULT, AttachDebuggerTracing): symbol not found