Invalid message: Session is already started when trying to debug a cell in Jupyter notebook

[epicwhale]

Applies To

• Notebooks (.ipynb files)
• Interactive Window and/or Cell Scripts (.py files with #%% markers)

What happened?

When I try to debug a cell in a notebook, the first cell runs in debug mode, when I run debug for the second cell, I get this error message.

VS Code Version

Version: 1.90.0-insider Commit: 0cd8d6ac480bc5b4e2a2d7f1eb87eaff9f7d47e1 Date: 2024-05-16T05:50:49.491Z Electron: 29.3.1 ElectronBuildId: 9464424 Chromium: 122.0.6261.156 Node.js: 20.9.0 V8: 12.2.281.27-electron.0 OS: Darwin arm64 23.4.0

Jupyter Extension Version

v2024.4.2024042601 (pre-release)

Jupyter logs

20:44:19.173 [debug] Cell Index:0 sent to kernel
20:44:19.182 [debug] [Debug] to kernel: {"command":"threads","type":"request","seq":18}
20:44:19.182 [debug] [Debug] to kernel, mapped: {"command":"threads","type":"request","seq":18}
20:44:19.183 [debug] Start cell 0 execution @ 1715892259183 (clear output)
20:44:19.183 [debug] Kernel acknowledged execution of cell 0 @ 1715892259183
20:44:19.194 [debug] [Debug] response: {"seq":17,"type":"response","request_seq":18,"success":true,"command":"threads","body":{"threads":[{"id":1,"name":"MainThread"},{"id":2,"name":"Thread-2 (_watch_pipe_fd)"},{"id":3,"name":"Thread-3 (_watch_pipe_fd)"},{"id":4,"name":"IPythonHistorySavingThread"}]}}
20:44:22.047 [debug] [Debug] event: {"header":{"msg_id":"82e43904-24f05d563bcd9dbf0456f18d_37452_109","msg_type":"debug_event","username":"~","session":"82e43904-24f05d563bcd9dbf0456f18d","date":"2024-05-16T20:44:22.046778Z","version":"5.3"},"parent_header":{"date":"2024-05-16T20:44:19.182000Z","msg_id":"1d4814f3-3619-444c-b759-940fb6565c78","msg_type":"debug_request","session":"3e1b4c1c-ab58-4754-84fe-5f1f6fe2d78d","username":"276f8c1f-910f-4ffb-a46d-dc33f5ceb4bb","version":"5.2"},"metadata":{},"content":{"seq":18,"type":"event","event":"thread","body":{"reason":"started","threadId":5}},"idents":[{"type":"Buffer","data":[107,101,114,110,101,108,46,52,97,52,53,50,52,101,100,45,99,55,50,98,45,52,55,56,48,45,97,100,53,48,45,52,100,56,50,51,55,48,57,53,48,99,97,46,100,101,98,117,103,95,101,118,101,110,116]}],"buffers":[],"channel":"iopub"}
20:44:22.109 [info] Cell 0 completed in 2.926s (start: 1715892259183, end: 1715892262109)
20:44:22.109 [debug] Cell 0 executed successfully
20:44:22.121 [info] Ending debug session 08644409-a45d-4483-b177-85997ff37592
20:44:22.164 [debug] [Debug] to kernel: {"command":"threads","type":"request","seq":19}
20:44:22.164 [debug] [Debug] to kernel, mapped: {"command":"threads","type":"request","seq":19}
20:44:22.169 [debug] [Debug] response: {"seq":19,"type":"response","request_seq":19,"success":true,"command":"threads","body":{"threads":[{"id":1,"name":"MainThread"},{"id":2,"name":"Thread-2 (_watch_pipe_fd)"},{"id":3,"name":"Thread-3 (_watch_pipe_fd)"},{"id":4,"name":"IPythonHistorySavingThread"},{"id":5,"name":"asyncio_0"}]}}
20:44:22.195 [info] Skipping sending message request because session is disposed
20:44:22.307 [debug] [Debug] event: {"header":{"msg_id":"82e43904-24f05d563bcd9dbf0456f18d_37452_120","msg_type":"debug_event","username":"~","session":"82e43904-24f05d563bcd9dbf0456f18d","date":"2024-05-16T20:44:22.307164Z","version":"5.3"},"parent_header":{"date":"2024-05-16T20:44:22.164000Z","msg_id":"9d8c9908-3db0-47e3-9f20-89ebeec2921a","msg_type":"debug_request","session":"3e1b4c1c-ab58-4754-84fe-5f1f6fe2d78d","username":"276f8c1f-910f-4ffb-a46d-dc33f5ceb4bb","version":"5.2"},"metadata":{},"content":{"seq":20,"type":"event","event":"thread","body":{"reason":"started","threadId":6}},"idents":[{"type":"Buffer","data":[107,101,114,110,101,108,46,52,97,52,53,50,52,101,100,45,99,55,50,98,45,52,55,56,48,45,97,100,53,48,45,52,100,56,50,51,55,48,57,53,48,99,97,46,100,101,98,117,103,95,101,118,101,110,116]}],"buffers":[],"channel":"iopub"}
20:44:22.310 [info] Execution of code ms-toolsai.jupyter-5 completed in 69ms
20:44:22.313 [debug] [Debug] event: {"header":{"msg_id":"82e43904-24f05d563bcd9dbf0456f18d_37452_124","msg_type":"debug_event","username":"~","session":"82e43904-24f05d563bcd9dbf0456f18d","date":"2024-05-16T20:44:22.312873Z","version":"5.3"},"parent_header":{"date":"2024-05-16T20:44:22.164000Z","msg_id":"9d8c9908-3db0-47e3-9f20-89ebeec2921a","msg_type":"debug_request","session":"3e1b4c1c-ab58-4754-84fe-5f1f6fe2d78d","username":"276f8c1f-910f-4ffb-a46d-dc33f5ceb4bb","version":"5.2"},"metadata":{},"content":{"seq":21,"type":"event","event":"thread","body":{"reason":"exited","threadId":6}},"idents":[{"type":"Buffer","data":[107,101,114,110,101,108,46,52,97,52,53,50,52,101,100,45,99,55,50,98,45,52,55,56,48,45,97,100,53,48,45,52,100,56,50,51,55,48,57,53,48,99,97,46,100,101,98,117,103,95,101,118,101,110,116]}],"buffers":[],"channel":"iopub"}
20:44:22.411 [debug] [Debug] to kernel: {"command":"threads","type":"request","seq":20}
20:44:22.411 [debug] [Debug] to kernel, mapped: {"command":"threads","type":"request","seq":20}
20:44:22.416 [debug] [Debug] response: {"seq":22,"type":"response","request_seq":20,"success":true,"command":"threads","body":{"threads":[{"id":1,"name":"MainThread"},{"id":2,"name":"Thread-2 (_watch_pipe_fd)"},{"id":3,"name":"Thread-3 (_watch_pipe_fd)"},{"id":4,"name":"IPythonHistorySavingThread"},{"id":5,"name":"asyncio_0"}]}}
20:44:23.571 [info] Starting debugging with mode 1
20:44:23.572 [debug] Executing silently Code (idle) = import builtins\nimport ipykernel\nbuiltins.print("5dc3a68c-e34e-4080-9c3e-2a532b2ccb4d" + ipykernel._
20:44:23.621 [debug] Executing silently Code (completed) = import builtins\nimport ipykernel\nbuiltins.print("5dc3a68c-e34e-4080-9c3e-2a532b2ccb4d" + ipykernel._ with 1 output(s)
20:44:23.648 [debug] [Debug] to kernel: {"command":"initialize","arguments":{"clientID":"vscode","clientName":"Visual Studio Code - Insiders","adapterID":"Python Kernel Debug Adapter","pathFormat":"path","linesStartAt1":true,"columnsStartAt1":true,"supportsVariableType":true,"supportsVariablePaging":true,"supportsRunInTerminalRequest":true,"locale":"en","supportsProgressReporting":true,"supportsInvalidatedEvent":true,"supportsMemoryReferences":true,"supportsArgsCanBeInterpretedByShell":true,"supportsMemoryEvent":true,"supportsStartDebuggingRequest":true},"type":"request","seq":1}
20:44:23.648 [debug] [Debug] to kernel, mapped: {"command":"initialize","arguments":{"clientID":"vscode","clientName":"Visual Studio Code - Insiders","adapterID":"Python Kernel Debug Adapter","pathFormat":"path","linesStartAt1":true,"columnsStartAt1":true,"supportsVariableType":true,"supportsVariablePaging":true,"supportsRunInTerminalRequest":true,"locale":"en","supportsProgressReporting":true,"supportsInvalidatedEvent":true,"supportsMemoryReferences":true,"supportsArgsCanBeInterpretedByShell":true,"supportsMemoryEvent":true,"supportsStartDebuggingRequest":true},"type":"request","seq":1}
20:44:23.653 [debug] [Debug] response: {"seq":23,"type":"response","request_seq":1,"success":true,"command":"initialize","body":{"supportsCompletionsRequest":true,"supportsConditionalBreakpoints":true,"supportsConfigurationDoneRequest":true,"supportsDebuggerProperties":true,"supportsDelayedStackTraceLoading":true,"supportsEvaluateForHovers":true,"supportsExceptionInfoRequest":true,"supportsExceptionOptions":true,"supportsFunctionBreakpoints":true,"supportsHitConditionalBreakpoints":true,"supportsLogPoints":true,"supportsModulesRequest":true,"supportsSetExpression":true,"supportsSetVariable":true,"supportsValueFormattingOptions":true,"supportsTerminateRequest":true,"supportsGotoTargetsRequest":true,"supportsClipboardContext":true,"exceptionBreakpointFilters":[{"filter":"raised","label":"Raised Exceptions","default":false,"description":"Break whenever any exception is raised."},{"filter":"uncaught","label":"Uncaught Exceptions","default":true,"description":"Break when the process is exiting due to unhandled exception."},{"filter":"userUnhandled","label":"User Uncaught Exceptions","default":false,"description":"Break when exception escapes into library code."}],"supportsStepInTargetsRequest":true,"supportsRestartRequest":true}}
20:44:23.698 [debug] [Debug-Reset] attach: Continuing paused kernel threads if needed
20:44:23.707 [debug] [Debug] to kernel: {"command":"debugInfo","type":"request","seq":3}
20:44:23.707 [debug] [Debug] to kernel, mapped: {"command":"debugInfo","type":"request","seq":3}
20:44:23.710 [debug] [Debug] response: {"type":"response","request_seq":3,"success":true,"command":"debugInfo","body":{"isStarted":true,"hashMethod":"Murmur2","hashSeed":3339675911,"tmpFilePrefix":"/tmp/ipykernel_37452/","tmpFileSuffix":".py","breakpoints":[],"stoppedThreads":[],"richRendering":true,"exceptionPaths":["Python Exceptions"],"copyToGlobals":true}}
20:44:23.758 [debug] [Debug] to kernel: {"command":"attach","arguments":{"type":"Python Kernel Debug Adapter","name":"###_###_appt_###_single.ipynb","request":"attach","justMyCode":true,"__mode":1,"__cellIndex":1,"__notebookUri":"file:///workspace/backend/###/###/notebooks/###_###_appt_###_single.ipynb","__sessionId":"45d86fb7-0a72-403a-8694-b07ee9f4d75c"},"type":"request","seq":2}
20:44:23.758 [debug] [Debug] to kernel, mapped: {"command":"attach","arguments":{"type":"Python Kernel Debug Adapter","name":"###_###_appt_###_single.ipynb","request":"attach","justMyCode":true,"__mode":1,"__cellIndex":1,"__notebookUri":"file:///workspace/backend/###/###/notebooks/###_###_appt_###_single.ipynb","__sessionId":"45d86fb7-0a72-403a-8694-b07ee9f4d75c"},"type":"request","seq":2}
20:44:23.763 [debug] [Debug] response: {"seq":24,"type":"response","request_seq":2,"success":false,"command":"attach","message":"Invalid message: Session is already started"}
20:44:23.821 [debug] [Debug] to kernel: {"command":"disconnect","arguments":{"restart":false},"type":"request","seq":4}
20:44:23.821 [debug] [Debug] to kernel, mapped: {"command":"disconnect","arguments":{"restart":false},"type":"request","seq":4}
20:44:23.825 [debug] [Debug] event: {"header":{"msg_id":"82e43904-24f05d563bcd9dbf0456f18d_37452_143","msg_type":"debug_event","username":"~","session":"82e43904-24f05d563bcd9dbf0456f18d","date":"2024-05-16T20:44:23.824919Z","version":"5.3"},"parent_header":{"date":"2024-05-16T20:44:23.821000Z","msg_id":"f4795814-ba78-4d10-8026-0213b7b2a1b8","msg_type":"debug_request","session":"3e1b4c1c-ab58-4754-84fe-5f1f6fe2d78d","username":"276f8c1f-910f-4ffb-a46d-dc33f5ceb4bb","version":"5.2"},"metadata":{},"content":{"seq":25,"type":"event","event":"terminated"},"idents":[{"type":"Buffer","data":[107,101,114,110,101,108,46,52,97,52,53,50,52,101,100,45,99,55,50,98,45,52,55,56,48,45,97,100,53,48,45,52,100,56,50,51,55,48,57,53,48,99,97,46,100,101,98,117,103,95,101,118,101,110,116]}],"buffers":[],"channel":"iopub"}
20:44:23.825 [debug] [Debug] event: {"header":{"msg_id":"82e43904-24f05d563bcd9dbf0456f18d_37452_143","msg_type":"debug_event","username":"~","session":"82e43904-24f05d563bcd9dbf0456f18d","date":"2024-05-16T20:44:23.824919Z","version":"5.3"},"parent_header":{"date":"2024-05-16T20:44:23.821000Z","msg_id":"f4795814-ba78-4d10-8026-0213b7b2a1b8","msg_type":"debug_request","session":"3e1b4c1c-ab58-4754-84fe-5f1f6fe2d78d","username":"276f8c1f-910f-4ffb-a46d-dc33f5ceb4bb","version":"5.2"},"metadata":{},"content":{"seq":25,"type":"event","event":"terminated"},"idents":[{"type":"Buffer","data":[107,101,114,110,101,108,46,52,97,52,53,50,52,101,100,45,99,55,50,98,45,52,55,56,48,45,97,100,53,48,45,52,100,56,50,51,55,48,57,53,48,99,97,46,100,101,98,117,103,95,101,118,101,110,116]}],"buffers":[],"channel":"iopub"}
20:44:23.826 [debug] [Debug] response: {"seq":26,"type":"response","request_seq":4,"success":true,"command":"disconnect"}
20:44:23.911 [debug] [Debug] to kernel: {"command":"disconnect","arguments":{"restart":false},"type":"request","seq":21}
20:44:23.911 [debug] [Debug] to kernel, mapped: {"command":"disconnect","arguments":{"restart":false},"type":"request","seq":21}
20:44:23.915 [debug] KernelProcess error 37452: [IPKernelApp] ERROR | Exception in control handler:
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/site-packages/ipykernel/kernelbase.py", line 362, in process_control
    await result
  File "/usr/local/lib/python3.12/site-packages/ipykernel/kernelbase.py", line 1039, in debug_request
    reply_content = await reply_content
                    ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/ipykernel/ipkernel.py", line 528, in do_debug_request
    return await self.debugger.process_request(msg)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/ipykernel/debugger.py", line 740, in process_request
    self.stop()
  File "/usr/local/lib/python3.12/site-packages/ipykernel/debugger.py", line 445, in stop
    self.debugpy_client.disconnect_tcp_socket()
  File "/usr/local/lib/python3.12/site-packages/ipykernel/debugger.py", line 280, in disconnect_tcp_socket
    self.debugpy_stream.socket.disconnect(self._get_endpoint())
  File "zmq/backend/cython/socket.pyx", line 664, in zmq.backend.cython.socket.Socket.disconnect
zmq.error.ZMQError: No such file or directory

Coding Language and Runtime Version

Python 3.12

Language Extension Version (if applicable)

v2024.6.0

Anaconda Version (if applicable)

No response

Running Jupyter locally or remotely?

Local

[DonJayamanne]

zmq/backend/cython/socket.pyx", line 664, in zmq.backend.cython.socket.Socket.disconnect
zmq.error.ZMQError: No such file or directory

Thank you for filling this issue and sorry you're running into this
Looks like the ipykernel dependencies (namely pyzmq or the like area not installed correctly) , it's not an issue with vscode

please try reinstalling them
Optionally pleasercreate a virtual environment, (or use conda) installing packages into global python envs is generally not recommended and prone to run into issues such as this.

[epicwhale]

zmq/backend/cython/socket.pyx", line 664, in zmq.backend.cython.socket.Socket.disconnect
zmq.error.ZMQError: No such file or directory

Thank you for filling this issue and sorry you're running into this Looks like the ipykernel dependencies (namely pyzmq or the like area not installed correctly) , it's not an issue with vscode

please try reinstalling them Optionally pleasercreate a virtual environment, (or use conda) installing packages into global python envs is generally not recommended and prone to run into issues such as this.

I am using the official vs code python dev containers
mcr.microsoft.com/devcontainers/python:1-3.12-bullseye

I believe this is managed by VS Code itself? What do you recommend reinstalling here? I thought it comes with the needful dependencies. @DonJayamanne

[epicwhale]

fwiw: I did a reinstall of whole package for now. Seems to be working inside the dev container

pip uninstall ipykernel
pip install ipykernel