debug cell in jupyter notebook never executes or reaches breakpoint

[ybagdasa]

Issue Type: Bug

The debug cell feature has stopped working in jupyter notebooks, while still working in python scripts. I've observed this with different breakpoints in different source files.

For jupyter cells, the execution just hangs with the options to step over, step into... etc grayed out. Only options to pause, reset, and disconnect debugger are available. Upon disconnecting, nothing is output from the cell.

Additionally I've noticed that sometimes when the notebook is first opened there is no option to debug the cell. After executing the cell, the option appears.

VS Code version: Code 1.64.2 (f80445acd5a3dadef24aa209168452a3d97cc326, 2022-02-09T22:02:29.527Z)
OS version: Linux x64 5.13.0-30-generic snap
Restricted Mode: No
Remote OS version: Linux x64 5.4.0-97-generic

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz (8 x 2000)
GPU Status	2d_canvas: unavailable_software gpu_compositing: disabled_software multiple_raster_threads: enabled_on oop_rasterization: disabled_off opengl: disabled_off rasterization: disabled_software skia_renderer: enabled_on video_decode: disabled_software vulkan: disabled_off webgl: unavailable_software webgl2: unavailable_software
Load (avg)	1, 1, 1
Memory (System)	15.52GB (5.42GB free)
Process Argv	--no-sandbox --force-user-env --unity-launch --crash-reporter-id 09889aea-dff4-45a4-8c0b-7ecc3bf3592e
Screen Reader	no
VM	0%
DESKTOP_SESSION	ubuntu
XDG_CURRENT_DESKTOP	Unity
XDG_SESSION_DESKTOP	ubuntu
XDG_SESSION_TYPE	x11

Item	Value
Remote	Container 10.0.0.95:5000/ybagdasa/pytorch1.10.0-cuda11.1-cudnn8-devel:detectron2 (ybdetectron2) @ ssh://10.158.62.106
OS	Linux x64 5.4.0-97-generic
CPUs	AMD EPYC 7302 16-Core Processor (32 x 1463)
Memory (System)	188.77GB (97.93GB free)
VM	0%

Extensions (20)

Extension	Author (truncated)	Version
jupyter-keymap	ms-	1.0.0
remote-containers	ms-	0.224.2
remote-ssh	ms-	0.74.0
remote-ssh-edit	ms-	0.74.0
remote-wsl	ms-	0.64.2
vscode-remote-extensionpack	ms-	0.21.0
preview-tiff	ana	1.0.1
gitkraken-authentication	git	1.0.3
kite	kit	0.147.0
vscode-docker	ms-	1.20.0
anaconda-extension-pack	ms-	1.0.1
python	ms-	2022.0.1814523869
vscode-pylance	ms-	2022.2.4
jupyter	ms-	2022.1.1301854968
jupyter-keymap	ms-	1.0.0
jupyter-renderers	ms-	1.0.6
autodocstring	njp	0.6.1
vscode-commons	red	0.0.6
vscode-yaml	red	1.4.0
pdf	tom	1.2.0

A/B Experiments

vsliv368cf:30146710
vsreu685:30147344
python383:30185418
vspor879:30202332
vspor708:30202333
vspor363:30204092
pythonvspyl392:30443607
pythontb:30283811
pythonptprofiler:30281270
vshan820:30294714
vstes263:30335439
pythondataviewer:30285071
vscod805cf:30301675
pythonvspyt200:30340761
binariesv615:30325510
bridge0708:30335490
bridge0723:30353136
vsaa593cf:30376535
vsc1dst:30438360
pythonvs932:30410667
wslgetstarted:30433507
vsclayoutctrc:30437038
vsrem710:30416614
dsvsc009:30440023
pythonvsnew555cf:30442237
vsbas813:30436447
vscscmwlcmt:30438805
helix:30440343
vscaac:30438847
vsnot107:30443614

[ybagdasa]

May be my mistake...I will look into this further and reopen if this is not my error.

[ybagdasa]

I made a mistake when testing the python script cell debugging--python script cell debugging works as expected. However the jupyter cell debugging does appear to be broken to me.

[ybagdasa]

In the debugging tab, everything appears to be empty (nothing in the call stack?)

[roblourens]

Can you check which version of ipykernel you have?

And can you set "jupyter.logging.level": "verbose" and share the log from the Jupyter output channel?

[ybagdasa]

@roblourens Not sure how to set the logging info...I just set it in the launch.json file.

Selected Jupyter core packages...
IPython : 7.31.1
ipykernel : 6.8.0
ipywidgets : 7.6.5
jupyter_client : 7.1.2
jupyter_core : 4.9.1
jupyter_server : not installed
jupyterlab : not installed
nbclient : 0.5.11
nbconvert : 6.3.0
nbformat : 5.1.3
notebook : 6.4.8
qtconsole : not installed
traitlets : 5.1.1
``
Logging...
When I try to debug a cell I get:

Info 22:49:51: Executing silently Code (idle) = import ipykernel\nprint(ipykernel.version)
Info 22:49:51: Executing silently Code (completed) = import ipykernel\nprint(ipykernel.version)

Nothing is shown on the call stack, and when I "disconnect" nothing else is logged.

[roblourens]

It goes in your settings, and when that's present there will be some logs telling us what happened when we tried to start debugging

[dmho418]

Same issue.
When I click "Debug cell" the left panel switches "Run and Debug" but nothing happens.
On the top it shows the wrong target configuration ("No configuration" in my case), the debug tool bar shows up (so the debugger did attach to something?), the "run by line" button gets grayed out, very similar to ybagdasa's screenshot.

I running on Windows with WSL, could be a bug in the remote.

VS Code: 1.65.2
OS: Windows_NT x64 10.0.19044
WSL Ubuntu 20.04 LTS
python 3.8.10
ipykernel 6.8.0
jupyter-client 7.1.2
jupyter-core 4.9.1

[Don-Felice]

Had the same problem:

VS Code: 1.65.2
Windows 10 Pro 10.0.19044
Python 3.8.10
ipykernel 6.8.0

Updating ipykernel to version 6.9.2 fixed it for me.

[IanMatthewHuff]

@ybagdasa and @dmho418 We've had some issues recently with the version of ipykernel / debugpy in use. Can you try updating those and see if that helps? Looks like that update helped @Don-Felice .

ipython/ipykernel#841
#9130

If you are still reproing I'd love the versions of ipykernel and debugpy that are in use.

[dmho418]

@IanMatthewHuff upgraded to ipykernel 6.11.0, the debugger is working now. Thanks!

[IanMatthewHuff]

@ybagdasa Given that this update helped both @dmho418 and @Don-Felice I'm going to close down this issue. If you are still seeing the problem with an updated ipykernel just message back here and I can reopen the issue.

[ybagdasa]

@IanMatthewHuff Confirming, that was indeed the issue. Working now with upgraded ipykernel.