Jupyter/Python extensions break Live Share in VS Code stable

[alyssajotice]

Recently Live Share received this issue from customers about the Python and Jupyter extensions breaking Live Share coediting: microsoft/live-share#4199
Users experience the "connection dropping" when Python is enabled and they are trying to coedit a .py file. User are in a Live Share session and can't send/receive coediting messages. Live Share works normally when Python was disabled.

Through my own testing, I discovered that this bug only repros on stable, but works as expected on Insiders.

Environment - Stable

Stable
VS Code Version: 1.55.2
Python Version: 2021.4.765268190
Jupyter Version: 2021.5.745244803
Behavior: Connection drops in a Live Share session as described above.

Environment - Insiders

Insiders
VS Code Version: 1.56.0
Python Version: 2021.4.765268190
Jupyter Version: 2021.6.811652604
Behavior: Live Share works as expected.

The newest version of Jupyter to download on stable is 2021.5.745244803 and the newest version to download on Insiders is 2021.6.811652604. It seems that the newer version will unblock our users. When will you be releasing the newer version of Jupyter to stable?

What could have changed between the extension versions that could cause this? Our users were complaining about the behavior in .py files, but I was able to repro the bug for .ipynb files on both stable and insiders, so it seems there is still an issue here.

[rchiodo]

Thanks for letting us know.

We have no interaction with liveshare when running .py files (or .ipynb files) so not sure what could have happened that makes it work in insiders.

Perhaps this is an intellisense issue? Do you have logs for it working/not working?

[alyssajotice]

It seems it becomes unresponsive:

[rchiodo]

Can you upload the CPU profile?

[alyssajotice]

exthost-b7e0cf.txt

When will the new version be released to stable?

[rchiodo]

When will the new version be released to stable?

Today I believe. The CPU profile is pointing to the python extension, not Jupyter so moving this issue there.

Python extension is not releasing today though. So unless the problem is in VS code itself, our release likely won't affect this.

[alyssajotice]

Could it be something in the Jupyter extension that Python relies on? The Python extension version was the same both when it repros and when it doesn't.

[rchiodo]

Shouldn't be AFAIK. Especially not in the path represented in the CPU profile.

[rchiodo]

Maybe the problem isn't caused by the code shown in the CPU profile. That may be a red herring.

What would cause Live share to drop a connection?

[alyssajotice]

What would cause Live share to drop a connection?

I am not sure but will try to investigate further. I will also check to see if the new version of Jupyter fixes the problem in stable.