`pytest` auto-discovery can hang in some cases blocking other tasks

[lskellerm]

Type: Bug

Behavior

1. Code changes to any file will set the "progress indicator" on the "Source Control" viewlet indefintely.
2. Any newly changed files will not appear under the changes dropdown.
3. This is causing other extensions to stop functioning properly as well (Copilot, Gitlens, Pull Request, Pulumi, AWS toolkit).

Expected vs. Actual Behavior

Expected -

Changes to files should very quickly show the progress indicator in the SCM extension viewlet and then resolve with the number of files where changes are detected.

Actual -

Change and staged files do not update correctly and source control indefinitely fails to display the number of files where changes are detected, instead showing a hanging "progress loader".

Steps to Reproduce

1. Open python file, make relevant code changes (it will work intermittently after vscode desktop starts up).
2. After what I observed is 3-4 saves to a changed file, the source control viewlet in the extension displays the previously described behavior.
3. Reloading Window will temporarily fix the issue, but then occurs after above mentiond steps, only to persist until another "Reload Window" operation.

Observed Workaround

After running an Extension Bisect, it was indicated that the ms-python.python extension was producing the previously outlined issues (note that this was the only extension disabled at the conclusion of the extension bisect)

Reverting to version 2024.20.0 seems to have made the bug go away and I was not able to reproduce the issue with this version enabled.

Diagnostic Data

2024-12-13 21:35:06.185 [info] > /usr/local/bin/python -m pytest -p vscode_pytest --collect-only --rootdir=.
2024-12-13 21:35:06.185 [info] cwd: .
2024-12-13 21:35:06.193 [error] /usr/local/bin/python: No module named pytest

2024-12-13 21:35:06.194 [error] Subprocess exited unsuccessfully with exit code 1 and signal null on workspace /workspaces/pulumi.
2024-12-13 21:35:06.195 [error] Subprocess exited unsuccessfully with exit code 1 and signal null on workspace /workspaces/pulumi. Creating and sending error discovery payload
2024-12-13 21:35:06.195 [error] pytest test discovery error for workspace:  /workspaces/pulumi 
  
 The python test process was terminated before it could exit on its own, the process errored with: Code: 1, Signal: null for workspace /workspaces/pulumi
2024-12-13 21:35:10.780 [info] Discover tests for workspace name: pulumi - uri: /workspaces/pulumi/compute/instances/connectableInstance.py
2024-12-13 21:35:10.780 [info] Running discovery for pytest using the new test adapter.
2024-12-13 21:35:31.724 [info] Discover tests for workspace name: pulumi - uri: /workspaces/pulumi/compute/instances/connectableInstance.py
2024-12-13 21:35:31.724 [info] Running discovery for pytest using the new test adapter.
2024-12-13 21:35:31.725 [error] Test discovery already in progress, not starting a new one.

Extension version: 2024.22.0
VS Code version: Code 1.96.0 (138f619c86f1199955d53b4166bef66ef252935c, 2024-12-11T02:29:09.626Z)
OS version: Linux x64 6.11.11-200.fc40.x86_64
Modes:
Remote OS version: Linux x64 6.11.11-200.fc40.x86_64

• Python version (& distribution if applicable, e.g. Anaconda): 3.12.7
• Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): Global
• Value of the python.languageServer setting: Default

User Settings

languageServer: "Pylance"

testing
• pytestEnabled: true

Installed Extensions

Extension Name	Extension Id	Version
autoDocstring - Python Docstring Generator	njpwerner.autodocstring	0.6.1
AWS boto3	Boto3typed.boto3-ide	0.6.0
AWS Toolkit	amazonwebservices.aws-toolkit-vscode	3.39.0
ESLint	dbaeumer.vscode-eslint	3.0.10
Even Better TOML	tamasfe.even-better-toml	0.19.2
GitHub Copilot	GitHub.copilot	1.251.0
GitHub Copilot Chat	GitHub.copilot-chat	0.23.1
GitHub Pull Requests	GitHub.vscode-pull-request-github	0.102.0
GitLens — Git supercharged	eamodio.gitlens	16.0.5
JavaScript Debugger	ms-vscode.js-debug	1.96.0
Prettier - Code formatter	esbenp.prettier-vscode	11.0.0
Pulumi	pulumi.pulumi-vscode-tools	0.2.2
Pulumi YAML	pulumi.pulumi-lsp-client	0.2.3
Pylance	ms-python.vscode-pylance	2024.12.1
Python	ms-python.python	2024.22.0
Python Debugger	ms-python.debugpy	2024.14.0
Ruff	charliermarsh.ruff	2024.56.0
shell-format	foxundermoon.shell-format	7.2.5
Table Visualizer for JavaScript Profiles	ms-vscode.vscode-js-profile-table	1.0.10

System Info

Item	Value
CPUs	AMD Ryzen 5 7600X 6-Core Processor (12 x 5129)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: disabled_software vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: disabled_off webnn: disabled_off
Load (avg)	1, 1, 1
Memory (System)	93.42GB (70.77GB free)
Process Argv	--crash-reporter-id 7c353e5b-56eb-41ee-8832-9589fef11963
Screen Reader	no
VM	0%
DESKTOP_SESSION	plasma
XDG_CURRENT_DESKTOP	KDE
XDG_SESSION_DESKTOP	KDE
XDG_SESSION_TYPE	wayland

Item	Value
Remote	Dev Container: Pulumi IaC Learning Dev Container
OS	Linux x64 6.11.11-200.fc40.x86_64
CPUs	AMD Ryzen 5 7600X 6-Core Processor (12 x 4347)
Memory (System)	93.42GB (70.77GB free)
VM	0%

A/B Experiments

vsliv368:30146709
vspor879:30202332
vspor708:30202333
vspor363:30204092
vscod805:30301674
binariesv615:30325510
vsaa593:30376534
py29gd2263:31024239
c4g48928:30535728
azure-dev_surveyone:30548225
vscrp:30673768
962ge761:30959799
pythonnoceb:30805159
pythonmypyd1:30879173
2e7ec940:31000449
pythontbext0:30879054
cppperfnew:31000557
dsvsc020:30976470
pythonait:31006305
dsvsc021:30996838
dvdeprecation:31068756
dwnewjupytercf:31046870
nativerepl1:31139838
pythonrstrctxt:31112756
nativeloc2:31192216
cf971741:31144450
iacca1:31171482
notype1:31157159
5fd0e150:31155592
dwcopilot:31170013
stablechunks:31184530
6074i472:31201624

[ashertechca]

I was having this issue for the whole day today and finally figured out that the issue is actually related to the test discoveries not SCM. Wish I had came across this earlier.

Couple of things helped in my case without having to downgrade the extension version.

• I had "python.testing.pytestEnabled": true so I ensured I have pytest package installed
• Also added the setting, "python.testing.autoTestDiscoverOnSaveEnabled": false

[shicaiv]

We have same issue with latest python extension I think 2024.22.0, we went back to 2024.20.0 and everything is fine now. We got this issue when we wanted to open test explorer and after that, everything was stuck...

[eleanorjboyd]

should be fixed by #24611