Attempting to debug in python "times out" on Win11

[smithrobs]

What happened?

Attempting a simple debug of a python program on Windows 11 "times out" with an error Unable to start debugging: context deadline exceeded

launch.config does not deviate from the example:

{
    "type": "pulumi",
    "request": "launch",
    "name": "pulumi preview",
    "command": "preview",
    "workDir": "${workspaceFolder}"
},

Debug console output:

Updating (dev)

View Live: <stack url>


@ Updating...............................................................
    pulumi:pulumi:Stack azure-py-dev  E1206 14:55:07.287129   30856 main.go:972] Unable to start debugging: context deadline exceeded
    pulumi:pulumi:Stack azure-py-dev  error: an unhandled error occurred: program exited with non-zero exit code: 1
    pulumi:pulumi:Stack azure-py-dev **failed** 1 error; 1 message
Diagnostics:
  pulumi:pulumi:Stack (azure-py-dev):
    E1206 14:55:07.287129   30856 main.go:972] Unable to start debugging: context deadline exceeded

    error: an unhandled error occurred: program exited with non-zero exit code: 1

Resources:

Duration: 1m1s

A non-debug pulumi up works fine.

Example

Any simple program will do

from pulumi_azure_native import resources

# Create an Azure Resource Group
resource_group = resources.ResourceGroup("resource_group")

Output of pulumi about

CLI
Version      3.142.0
Go Version   go1.23.3
Go Compiler  gc

Plugins
KIND      NAME          VERSION
resource  azure-native  2.75.0
language  python        unknown

Host     
OS       Microsoft Windows 11 Pro
Version  10.0.22631 Build 22631
Arch     x86_64

This project is written in python: executable='F:\Projects\Pulumi\_scratch\azure-py\venv\Scripts\python.exe' version='3.12.6'

Found no resources associated with dev

Found no pending operations associated with dev

Backend        
Name           pulumi.com
URL            https://app.pulumi.com/smithrobs
User           smithrobs
Organizations  smithrobs
Token type     personal

Dependencies:
NAME                 VERSION
pip                  24.3.1
pulumi_azure_native  2.75.0
setuptools           75.6.0
wheel                0.45.1

Additional context

No response

Contributing

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[LachlanMarnham]

I'm seeing the same behaviour on Windows 10. The behaviour we see is the same for both preview and up launch configurations for every stack, in every project for every team member. Full output is as follows:

Previewing update (prd)

View Live: <url>

@ Previewing update.....

@ Previewing update................................................................
    pulumi:pulumi:Stack auth-prd  2025/02/26 11:35:06 Error in Watcher Error channel: CancelIo: The handle is invalid.
    pulumi:pulumi:Stack auth-prd  2025/02/26 11:35:06 Error in Watcher Error channel: CloseHandle: The handle is invalid.
    pulumi:pulumi:Stack auth-prd  E0226 11:35:06.461236    1688 main.go:1032] Unable to start debugging: context deadline exceeded
    pulumi:pulumi:Stack auth-prd  error: an unhandled error occurred: program exited with non-zero exit code: 1
    pulumi:pulumi:Stack auth-prd  1 error; 3 messages
Diagnostics:
  pulumi:pulumi:Stack (auth-prd):
    2025/02/26 11:35:06 Error in Watcher Error channel: CancelIo: The handle is invalid.
    2025/02/26 11:35:06 Error in Watcher Error channel: CloseHandle: The handle is invalid.
    E0226 11:35:06.461236    1688 main.go:1032] Unable to start debugging: context deadline exceeded

    error: an unhandled error occurred: program exited with non-zero exit code: 1

Resources:

[LachlanMarnham]

Has anybody found a workaround for this? It seems Pulumi simply can't be debugged on Windows, which is very concerning given that it is still the most widely-used operating system for developers.

Even if the VSCode integration doesn't work, we need some way (no matter how un-ergonomic) to put breakpoints in Pulumi code, and the instructions under debugging with other IDEs also doesn't seem to work on Windows (at least I haven't been able to get it to work; open to suggestions here).