IntelliSense suddenly does not work during testing.

[linette-zyy]

Environment

Additional context and screenshots
This issue occurs very frequently. The IntelliSense always does not work during testing. Restart VS and the PC cannot solve the issue.

Pylance output

[StellaHuang95]

Can you go to Tools -> Python -> Analysis, set your Log Level to Trace, and share the logs again when pylance crashes?

[ttSpace]

In today's build 17.9.0 Preview 3.0 [34405.157.main], Python Package: 17.0.23314.1, I can repro it.

Logs

Output for Pylance in the Output panel

Info: (7260) Pylance language server 2023.11.10 (pyright 088ebaa5) starting
Info: (7260) Server root directory: C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist
Info: (7260) Starting service instance "PythonApplication2"
Info: Un-registering request handler for 9b30e5c5-c689-41b0-9911-0c852a159693 failed.
Log: (7260) No configuration file found.
Log: (7260) No pyproject.toml file found.
Info: (7260) Setting pythonPath for service "PythonApplication2": "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\python3.9.exe"
Info: (7260) Assuming Python version 3.9
Log: (7260) Assuming Python platform Windows
Info: (7260) Search paths for C:\Users\vting\source\repos\PythonApplication2\PythonApplication2
Info: (7260)   C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist\typeshed-fallback\stdlib
Info: (7260)   C:\Users\vting\source\repos\PythonApplication2\PythonApplication2
Info: (7260)   C:\Users\vting\source\repos\PythonApplication2\PythonApplication2\typings
Info: (7260)   C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist\typeshed-fallback\stubs\...
Info: (7260)   C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist\bundled\stubs
Info: (7260)   C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\DLLs
Info: (7260)   C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\Lib
Info: (7260)   C:\Users\vting\AppData\Local\Microsoft\WindowsApps\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0
Info: (7260)   C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0
Info: (7260)   C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\Lib\site-packages
Info: (7260) Adding fs watcher for library directories:
 C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\DLLs
C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\Lib
C:\Users\vting\AppData\Local\Microsoft\WindowsApps\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0
C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0
C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\Lib\site-packages
Info: (7260) Adding fs watcher for directories:
 C:\Users\vting\source\repos\PythonApplication2\PythonApplication2
Log: (7260) Searching for source files
Info: (7260) Found 1 source file
Log: (7260) pytest configurations: {"message":"script","classes":["Test"],"files":["test_*.py","*_test.py"],"functions":["test"]}
Log: (7260) pytest configurations: {"message":"script","classes":["Test"],"files":["test_*.py","*_test.py"],"functions":["test"]}
Log: (7260) [IDX(FG)] index libraries C:\Users\vting\source\repos\PythonApplication2\PythonApplication2 (index) ...
Log: (7260) [IDX(FG)]   read stdlib indices (34ms)
Log: (7260) [IDX(FG)] index libraries C:\Users\vting\source\repos\PythonApplication2\PythonApplication2 (index) [succeed] (37ms)
Log: (7260) [FG] parsing: C:\Users\vting\source\repos\PythonApplication2\PythonApplication2\PythonApplication2.py (13ms)
Log: (7260) [FG] parsing: C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist\typeshed-fallback\stdlib\builtins.pyi [fs read 3ms] (173ms)
Log: (7260) [FG] binding: C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist\typeshed-fallback\stdlib\builtins.pyi (66ms)
Log: (7260) [FG] binding: C:\Users\vting\source\repos\PythonApplication2\PythonApplication2\PythonApplication2.py (1ms)
Info: (8348) Pylance language server 2023.11.10 (pyright 088ebaa5) starting
Info: (8348) Server root directory: C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist
Info: (8348) Starting service instance "<default>"
Info: (8348) No source files found.
Info: (11844) Pylance language server 2023.11.10 (pyright 088ebaa5) starting
Info: (11844) Server root directory: C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist
Info: (11844) Starting service instance "<default>"
Info: (11844) No source files found.
Info: (9860) Pylance language server 2023.11.10 (pyright 088ebaa5) starting
Info: (9860) Server root directory: C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist
Info: (9860) Starting service instance "<default>"
Info: (9860) No source files found.
Info: (12440) Pylance language server 2023.11.10 (pyright 088ebaa5) starting
Info: (12440) Server root directory: C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist
Info: (12440) Starting service instance "<default>"

[StellaHuang95]

Still can't repro this one. Did you reopen your solution/project? What did you do between the two server starts?

[ttSpace]

Open a Python project to get this log. (No IntelliSense)

Logs

Output for Pylance in the Output panel

Info: (19864) Pylance language server 2023.11.10 (pyright 088ebaa5) starting
Info: (19864) Server root directory: C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist
Info: (19864) Starting service instance "PythonApplication14"
Info: Un-registering request handler for 16a82e48-b50f-4466-9542-253c9f56e5cb failed.
Log: (19864) No configuration file found.
Log: (19864) No pyproject.toml file found.
Info: (19864) Setting pythonPath for service "PythonApplication14": "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\python3.9.exe"
Info: (19864) Assuming Python version 3.9
Log: (19864) Assuming Python platform Windows
Info: (19864) Search paths for C:\Users\vting\source\repos\PythonApplication14\PythonApplication14
Info: (19864)   C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist\typeshed-fallback\stdlib
Info: (19864)   C:\Users\vting\source\repos\PythonApplication14\PythonApplication14
Info: (19864)   C:\Users\vting\source\repos\PythonApplication14\PythonApplication14\typings
Info: (19864)   C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist\typeshed-fallback\stubs\...
Info: (19864)   C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist\bundled\stubs
Info: (19864)   C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\DLLs
Info: (19864)   C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\Lib
Info: (19864)   C:\Users\vting\AppData\Local\Microsoft\WindowsApps\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0
Info: (19864)   C:\Users\vting\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages
Info: (19864)   C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0
Info: (19864)   C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\Lib\site-packages
Info: (19864) Adding fs watcher for library directories:
 C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\DLLs
C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\Lib
C:\Users\vting\AppData\Local\Microsoft\WindowsApps\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0
C:\Users\vting\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages
C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0
C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\Lib\site-packages
Info: (19864) Adding fs watcher for directories:
 C:\Users\vting\source\repos\PythonApplication14\PythonApplication14
Log: (19864) Searching for source files
Info: (19864) Found 1 source file
Log: (19864) pytest configurations: {"message":"script","classes":["Test"],"files":["test_*.py","*_test.py"],"functions":["test"]}
Log: (19864) pytest configurations: {"message":"script","classes":["Test"],"files":["test_*.py","*_test.py"],"functions":["test"]}
Log: (19864) [IDX(FG)] index libraries C:\Users\vting\source\repos\PythonApplication14\PythonApplication14 (index) ...
Log: (19864) [IDX(FG)]   read stdlib indices (34ms)
Log: (19864) [IDX(FG)] index libraries C:\Users\vting\source\repos\PythonApplication14\PythonApplication14 (index) [succeed] (37ms)
Log: (19864) [FG] parsing: C:\Users\vting\source\repos\PythonApplication14\PythonApplication14\PythonApplication14.py (14ms)
Log: (19864) [FG] parsing: C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist\typeshed-fallback\stdlib\builtins.pyi [fs read 4ms] (186ms)
Log: (19864) [FG] binding: C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist\typeshed-fallback\stdlib\builtins.pyi (70ms)
Log: (19864) [FG] binding: C:\Users\vting\source\repos\PythonApplication14\PythonApplication14\PythonApplication14.py (0ms)
Info: (9400) Pylance language server 2023.11.10 (pyright 088ebaa5) starting
Info: (9400) Server root directory: C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist
Info: (9400) Starting service instance "<default>"
Info: (9400) No source files found.
Info: (17424) Pylance language server 2023.11.10 (pyright 088ebaa5) starting
Info: (17424) Server root directory: C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist
Info: (17424) Starting service instance "<default>"
Info: (17424) No source files found.
Info: (10172) Pylance language server 2023.11.10 (pyright 088ebaa5) starting
Info: (10172) Server root directory: C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist
Info: (10172) Starting service instance "<default>"
Info: (10172) No source files found.
Info: (15012) Pylance language server 2023.11.10 (pyright 088ebaa5) starting
Info: (15012) Server root directory: C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist
Info: (15012) Starting service instance "<default>"

[StellaHuang95]

@ttSpace Still can't repro this. The logs don't say anything useful, can you share the gif when this is happening?

[ttSpace]

In today's build 17.9.0 Preview 3.0 [34412.151.main], Python Package: 17.0.23345.1, I can repro it with Python installed from Microsoft store. (Note: Often happens when Python is installed in the Microsoft Store.）

Logs

Output for Pylance in the Output panel

Info: (16336) Pylance language server 2023.11.10 (pyright 088ebaa5) starting
Info: (16336) Server root directory: C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist
Info: (16336) Starting service instance "PythonApplication4"
Info: Un-registering request handler for 738236c4-6d46-4e44-9b0b-d3626c565e21 failed.
Log: (16336) No configuration file found.
Log: (16336) No pyproject.toml file found.
Info: (16336) Setting pythonPath for service "PythonApplication4": "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\python3.9.exe"
Info: (16336) Assuming Python version 3.9
Log: (16336) Assuming Python platform Windows
Info: (16336) Search paths for C:\Users\vting\source\repos\PythonApplication4\PythonApplication4
Info: (16336)   C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist\typeshed-fallback\stdlib
Info: (16336)   C:\Users\vting\source\repos\PythonApplication4\PythonApplication4
Info: (16336)   C:\Users\vting\source\repos\PythonApplication4\PythonApplication4\typings
Info: (16336)   C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist\typeshed-fallback\stubs\...
Info: (16336)   C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist\bundled\stubs
Info: (16336)   C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\DLLs
Info: (16336)   C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\Lib
Info: (16336)   C:\Users\vting\AppData\Local\Microsoft\WindowsApps\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0
Info: (16336)   C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0
Info: (16336)   C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\Lib\site-packages
Info: (16336) Adding fs watcher for library directories:
 C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\DLLs
C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\Lib
C:\Users\vting\AppData\Local\Microsoft\WindowsApps\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0
C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0
C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\Lib\site-packages
Info: (16336) Adding fs watcher for directories:
 C:\Users\vting\source\repos\PythonApplication4\PythonApplication4
Log: (16336) Searching for source files
Info: (16336) Found 1 source file
Log: (16336) pytest configurations: {"message":"script","classes":["Test"],"files":["test_*.py","*_test.py"],"functions":["test"]}
Log: (16336) pytest configurations: {"message":"script","classes":["Test"],"files":["test_*.py","*_test.py"],"functions":["test"]}
Log: (16336) [IDX(FG)] index libraries C:\Users\vting\source\repos\PythonApplication4\PythonApplication4 (index) ...
Log: (16336) [IDX(FG)]   read stdlib indices (50ms)
Log: (16336) [IDX(FG)] index libraries C:\Users\vting\source\repos\PythonApplication4\PythonApplication4 (index) [succeed] (54ms)
Log: (16336) [FG] parsing: C:\Users\vting\source\repos\PythonApplication4\PythonApplication4\PythonApplication4.py (29ms)
Log: (16336) [FG] parsing: C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist\typeshed-fallback\stdlib\builtins.pyi [fs read 4ms] (254ms)
Log: (16336) [FG] binding: C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist\typeshed-fallback\stdlib\builtins.pyi (82ms)
Log: (16336) [FG] binding: C:\Users\vting\source\repos\PythonApplication4\PythonApplication4\PythonApplication4.py (0ms)
Info: (16308) Pylance language server 2023.11.10 (pyright 088ebaa5) starting
Info: (16308) Server root directory: C:\Program Files\Microsoft Visual Studio\2022\Preview\Common7\IDE\Extensions\Microsoft\Python\Core\pylance\dist
Info: (16308) Starting service instance "<default>"

[StellaHuang95]

ok thanks, now I am able to repro with Microsoft store python.

I am seeing AssignProcessToJobObject: (87) The parameter is incorrect. in output.

There was a similar issue with Microsoft stroe apps. libuv/libuv#4152, microsoft/vscode#186912 (comment)

Also found a same issue in pylance that wasn't reproducible at that time. microsoft/pylance-release#1118

Also tested with different versions of pylance, and the results are:

pylance 2023.10.30 or before -> good
pylance 2023.10.40 or later -> bad

based on changelogs, this is the only change from 2023.10.30

Bug fix: Pylance latest release killing remote connections to notebooks microsoft/pylance-release#4983

PR is at https://github.com/microsoft/pyrx/pull/4210/files