ChannelClosedException: The channel has been closed - Intellisense and F8 stop working

[dbrennand]

Prerequisites

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• I have searched all open and closed issues to ensure it has not already been reported.
• I have read the troubleshooting guide.
• I am sure this issue is with the extension itself and does not reproduce in a standalone PowerShell instance.
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Summary

Hi,

I've been experiencing an issue where predictive intellisense and F8 (run line/code selection) stop working.
I've collected some diagnostic logs and noticed the following error:

2022-09-21 10:20:25.349 +01:00 [VRB] Could not write to output handler, perhaps serialization failed?
System.Threading.Channels.ChannelClosedException: The channel has been closed.
   at System.Threading.Channels.AsyncOperation`1.GetResult(Int16 token)
   at OmniSharp.Extensions.JsonRpc.OutputHandler.ProcessOutputStream(CancellationToken cancellationToken)

Once this error occurs in the logs, I have to restart the integrated terminal for it to work again.

I noticed a similar error reported in #3800 and when this error occurs, I also have the endless formatting behaviour, but also intellisense and F8 stop working for me. This issue occurs for me on the latest PowerShell extension and preview extension.

Logs to follow via email.

PowerShell Version

PowerShell Extension v2022.8.5
Copyright (c) Microsoft Corporation.

https://aka.ms/vscode-powershell
Type 'help' to get help.

PS> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      7.2.6
PSEdition                      Core
GitCommitId                    7.2.6
OS                             Microsoft Windows 10.0.19042
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Visual Studio Code Version

1.71.2
74b1f979648cc44d385a2286793c226e611f59e7
x64

Extension Version

ms-vscode.powershell@2022.8.5

Steps to Reproduce

1. Launch project in VSCode: code .
2. Open PowerShell script file and extension with integrated terminal is loaded.
3. All is working for a short time and then predictive intellisense and F8 stop working.

Apologies for the lack of repo steps 😞 but I'm really not sure what exactly is causing this issue.

Visuals

No response

Logs

Logs sent via email.

[dbrennand]

Issue persists on latest preview ms-vscode.powershell-preview@2022.9.0

[andyleejordan]

Do you have any anti-virus running?

This issue was closed automatically as author feedback was indicated as needed, but there has been no activity in over a week. Please feel free to reopen with any available information!

[dbrennand]

Apologies for the delayed response, yes there is anti-virus running on the device I'm experiencing this issue with.

[andyleejordan]

That would be my best guess. Can you temporarily disable it, especially any real-time setting, and see if it continues to repro? We have seen aggressive anti-virus software kill the process before.

[dbrennand]

That would be my best guess. Can you temporarily disable it, especially any real-time setting, and see if it continues to repro? We have seen aggressive anti-virus software kill the process before.

Hmmm 🤔 OK, I've checked the event logs and I can't see any indication that the process is being blocked/killed. Unfortunately, I cannot disable it 🙁

Guess I'm kinda toast 🍞 😅

[andyleejordan]

Oof, that's unfortunate. Do you have a similar machine without the AV that you can try to repro on? Or does your AV allow you to add folder exceptions?