NET10 applications can crash with HRESULT=0x8013132d error when running debugger in VS2022 and VS2026

[tommcdon]

Description

This was originally filed as a VS Feedback ticket here: https://developercommunity.visualstudio.com/t/HRESULT0x8013132d-error-when-running-de/11022347

Reproduction Steps

Create a new blank solution.
Inside this new solution, create a new ASP.NET Core Web API project. Leave all settings on default in doing so.
Start debugging -> Error message pops up.

Expected behavior

Application runs.

Actual behavior

Application fails with 0x8013132d CORDBG_E_BAD_THREAD_STATE

Regression?

Reproduced in .NET 10 (works in .NET 8)

Known Workarounds

No known workarounds

Configuration

.NET 10 Windows AnyCPU,

Other information

No response

[tommcdon]

The VS feedback ticket is already closed and doesn't support comments. To the person that opened the VS feedback item, please try disabling CET to determine if the issue is related to out of process SetThreadContext - https://learn.microsoft.com/dotnet/core/compatibility/interop/9.0/cet-support

[dotnet-policy-service]

This issue has been marked needs-author-action and may be missing some important information.

[arwin-swapna]

@tommcdon Debugging works after I set CETCompat to false.

[RTKing]

That worked for me as well, thank you!

[tommcdon]

@arwin-swapna @RTKing Out of curiosity what is the hardware + OS version you are using? It is not expected for debugging to fail with CET enabled on .NET 9 and 10.

[RTKing]

@tommcdon my system information is below. Additionally, while attempting to troubleshoot this issue, I created a barebones console application targeting .NET 10 just to confirm it wasn't something specific to the application I was working on. Even ran a repair on my Visual Studio 2026 instance.

• OS = Windows 11 Enterprise (Version 10.0.22631 Build 22631)
• Processor = 12th Gen Intel Core i9-12900H, 2500 Mhz, 14 Core(s), 20 Logical Processor(s)
• RAM = 32 GB

[arwin-swapna]

• Windows 11 Enterprise (23H2 Build 22631)
• AMD Ryzen AI 7 Pro 360
• RAM 64 GB