How to fix StackOverflowException after upgrading from .Net 6 to .Net 8

Abhishek, Burra 5

Hello,

I have upgraded 5 projects in my solution from .Net 6 to .Net 8 using upgrade assistant in Visual Studio.

When I run the solution, StackOverflowException is being thrown and Swagger is not loading. Looks like onchangetokenfired() method is being called many times resulting in infinite loop.

Please help in fixing this issue.

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Ping Ni-MSFT 2,250 Reputation points Microsoft Vendor

2024-04-30T02:07:42.6266667+00:00
Hi @Abhishek, Burra, For just share the StackOverflowException is so broad that you need follow the steps to troubleshooting:

Review the OnChangeTokenFired() Method: Make sure that the method is handling change tokens correctly and that it's not inadvertently triggering its own execution in an infinite loop.

Debugging: Use debugging tools in Visual Studio or your IDE to step through the code and track the flow of execution.

Logging: Add logging statements to your code to trace the execution flow and log relevant information about method invocations, change token events, and any other relevant events or state changes. .

Review Upgrade Assistant Changes: You recently upgraded your projects from .NET 6 to .NET 8 using Upgrade Assistant, review the changes made by the tool to ensure that they're compatible with your codebase. It's possible that some changes made during the upgrade process inadvertently introduced a regression or compatibility issue that's causing the StackOverflowException.

Check Swagger Configuration: If Swagger is not loading after the upgrade, review the Swagger configuration in your project. Look for any errors or warnings related to Swagger configuration in the logs or output window. If still not working after following the steps, it is better for you to share a minimal repo which can reproduce the issue.
Abhishek, Burra 5 Reputation points

2024-05-02T07:44:08.1966667+00:00

Hi Ping,

We've tried all the above suggested troubleshooting steps and still the issue is persisting.

However, we deployed same code to Azure App Service and it is working fine. So, looks like it is working in publish mode and not in debug mode in Visual Studio in local.
Ping Ni-MSFT 2,250 Reputation points Microsoft Vendor

2024-05-03T01:49:54.88+00:00

Hi @Abhishek, Burra, pls share your Program.cs and Startup.cs if contains. It is better for you to share a minimal repo which could reproduce the issue.
Abhishek, Burra 5 Reputation points

2024-05-06T06:35:20.4833333+00:00

Program.cs.txt Startup.cs.txt

Hi Ping,

Please find the attached Program.cs and Startup.cs.
Abhishek, Burra 5 Reputation points

2024-05-07T06:13:09.9633333+00:00

FYI..

The problem is only in Visual Studio. It works fine in VS Code after the upgrade.

So, please help in resolving the exception in Visual Studio.
Abhishek, Burra 5 Reputation points

2024-05-09T13:41:15.6+00:00

Adding info..

While I run the solution in VS Code via command "dotnet run" it is running successfully but to debug the code I've installed C# toolkit in VS Code same exception is being thrown.

Please suggest any possible approach to resolve this.
AgaveJoe 26,151 Reputation points

2024-05-09T15:23:06.2666667+00:00

Please suggest any possible approach to resolve this.

I would set a break point and single stepping through the startup code. I would also add logging so you can see where the code fails.

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How to fix StackOverflowException after upgrading from .Net 6 to .Net 8