[non-deterministic] is_client_connected() crashes with KeyError: '_pydevd_bundle.pydevd_comm_constants' #2020

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1. rchiodo commented on Apr 29, 2026

   

   Rich Chiodo (rchiodo)

   on Apr 29, 2026

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   Thanks for the issue. Without a reproduction it'd be hard to diagnose though. The callstack doesn't make much sense to me. How can the loader have a key error?
2. Rich Chiodo (rchiodo)

   closed this as completedon Apr 29, 2026
3. francescomikulis commented on May 5, 2026

   

   Francesco Alessandro Stefano Mikulis-Borsoi (francescomikulis)

   on May 5, 2026

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   Unfortunately the setup to reproduce this is complex.
   I'm using pytest-xdist with async tests.
   A function I call during the test, within an async context, and potentially many times in parallel (one per process) is:

   debugpy_is_client_connected()
   

   I'm using a .venv generated by uv.

   Also, this just happened again, this time with a different key error:

   ..[my private code]..
       and not debugpy_is_client_connected()
   ../../../.venv/lib/python3.13/site-packages/debugpy/public_api.py:44: in wrapper
       from debugpy.server import api
   ../../../.venv/lib/python3.13/site-packages/debugpy/server/__init__.py:7: in <module>
       import debugpy._vendored.force_pydevd  # noqa
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   ../../../.venv/lib/python3.13/site-packages/debugpy/_vendored/force_pydevd.py:44: in <module>
       preimport('pydevd', [
   ../../../.venv/lib/python3.13/site-packages/debugpy/_vendored/__init__.py:126: in preimport
       import_module(name)
   /home/runner/.local/share/uv/python/cpython-3.13.11-linux-x86_64-gnu/lib/python3.13/importlib/__init__.py:88: in import_module
       return _bootstrap._gcd_import(name[level:], package, level)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   ../../../.venv/lib/python3.13/site-packages/debugpy/_vendored/pydevd/pydevd.py:51: in <module>
       from _pydev_bundle.pydev_console_utils import DebugConsoleStdIn
   <frozen importlib._bootstrap>:1360: in _find_and_load
       ???
   <frozen importlib._bootstrap>:1331: in _find_and_load_unlocked
       ???
   _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
   
   spec = ModuleSpec(name='_pydev_bundle.pydev_console_utils', loader=<_frozen_importlib_external.SourceFileLoader object at ../.venv/lib/python3.13/site-packages/debugpy/_vendored/pydevd/_pydev_bundle/pydev_console_utils.py')
   
   >   ???
   E   KeyError: '_pydev_bundle.pydev_console_utils'
   
   <frozen importlib._bootstrap>:946: KeyError
4. francescomikulis commented on May 5, 2026

   

   Francesco Alessandro Stefano Mikulis-Borsoi (francescomikulis)

   on May 5, 2026

   Author

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   Unfortunately the setup to reproduce this is complex.
   I'm using pytest-xdist with async tests.
   A function I call during the test, within an async context, and potentially many times in parallel (one per process) is:
   debugpy_is_client_connected()
   I'm using a .venv generated by uv.

   Rich Chiodo (@rchiodo) is the above enough background?
5. rchiodo commented on May 5, 2026

   

   Rich Chiodo (rchiodo)

   on May 5, 2026

   Contributor

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   I'd need tests that reproduce it. That's not enough for me to figure out where the problem is. Otherwise my guess is that the debugpy module is getting loaded from the wrong path and it can't find the matching pydevd.