WinformsControlsTest cannot be run under debugger in Visual Studio

[WPMGPRoSToTeMa]

• .NET Core Version:
  7.0.0-beta.22078.2

• Have you experienced this same bug with .NET Framework?:
  No

Problem description:
WinformsControlsTest cannot be run under debugger using F5 in Visual Studio, the following error is shown:
A fatal error has occurred and debugging needs to be terminated. For more details, please see the Microsoft Help and Support web site. HRESULT=0x80070057. ErrorCode=0x0.

It was found that this problem is caused by dotnet/winforms#6569 dotnet/winforms#6573.

WinformsControlsTest still can be run without debugger attached using Ctrl+F5. Debugging also doesn't work if attach the debugger later - breakpoints cannot be hit and there are no assemblies in Modules window.

Expected behavior:
It should be possible to run WinformsControlsTest with debugger attached in Visual Studio.

Minimal repro:

1. Open the solution using start-vs.
2. Choose WinformsControlsTest as the current project on the toolbar.
3. Click Run or press F5.

[dreddy-work]

Can you add call stack for this and see if this is something that need to be addressed by runtime?

[WPMGPRoSToTeMa]

Can you add call stack for this and see if this is something that need to be addressed by runtime?

That's the only thing I see in the Output window:

The program '[3244] WinformsControlsTest.exe' has exited with code 4294967295 (0xffffffff).
The program '[3244] WinformsControlsTest.exe: Program Trace' has exited with code 0 (0x0).

[RussKie]

dotnet/winforms#6573 is the one to blame. I tried the following steps:

1. checkout 18f55098710a3bb0c06cc50756fde323f4af8b00
2. .\restore.cmd
3. .\start-vs.cmd
4. F5 in VS <-- works
5. checkout 059d14c3b74720a83b1e3fe1b02dcd26b9cb09bf
6. .\restore.cmd
7. F5 in VS <-- crash

[ghost]

Tagging subscribers to this area: @tommcdon
See info in area-owners.md if you want to be subscribed.

Issue Details

---

• .NET Core Version:
  7.0.0-beta.22078.2

• Have you experienced this same bug with .NET Framework?:
  No

Problem description:
WinformsControlsTest cannot be run under debugger using F5 in Visual Studio, the following error is shown:

It was found that this problem is caused by dotnet/winforms#6569.

WinformsControlsTest still can be run without debugger attached using Ctrl+F5. Debugging also doesn't work if attach the debugger later - breakpoints cannot be hit and there are no assemblies in Modules window.

Expected behavior:
It should be possible to run WinformsControlsTest with debugger attached in Visual Studio.

Minimal repro:

1. Open the solution using start-vs.
2. Choose WinformsControlsTest as the current project on the toolbar.
3. Click Run or press F5.

Author:	WPMGPRoSToTeMa
Assignees:	-
Labels:	area-Diagnostics-coreclr, untriaged
Milestone:	-

[WPMGPRoSToTeMa]

@RussKie thanks. Sorry, I was doing that without a VS restart and stopped at a good commit.

[dreddy-work]

Debugging tests are blocked here.

[tommcdon]

Thanks for the bug report - we have found the root cause and are working on a fix: #64523

[tommcdon]

#64523 is merged, so this should be fixed on the next build

[RussKie]

Awesome!

[tommcdon]

Closing via #64523
It looks like the fix has been merged into winforms on dotnet/winforms@ff8a062
Please let us know if there are any issues