--blame-hang equivalent for AoT testing

[martincostello]

Summary

Add a similar capability to dotnet test's --blame-hang functionality to make it easier to diagnose the source of hanging tests.

Background and Motivation

I have a test suite using the new AoT test runner where sometimes something hangs in one of the tests, but only when it's running in native AoT. The effectively identical tests I have that use xunit via dotnet test don't exhibit the same behaviour where I could use --blame-hang.

Additionally, using [Timeout(...)] doesn't seem to be having any effect. I'd expect the hanging test to timeout and fail, not hang.

Proposed Feature

A similar (I assume identical would be too difficult within a native AoT environment) set of command-line switches to allow for dumps to be generated to identify tests that hang. For example:

my-aot-tests.exe --blame-hang --blame-hang-dump-type <DUMP_TYPE> --blame-hang-timeout <TIMESPAN>

Alternative Designs

None.

[thomhurst]

There's a Microsoft.Testing.Extensions.HangDump package you can install. Info is here: https://learn.microsoft.com/en-us/dotnet/core/testing/unit-testing-platform-extensions-diagnostics

Is that what you want?

[martincostello]

Thanks for the tip, I didn't know about that 🙇‍♂️

Of course, I'm now having trouble getting it to work properly on not-Windows...

[martincostello]

Alas, that lead me to #3097.

[Evangelink]

@martincostello I will close this ticket and we will handle support for hang dump in non-windows. We have explored multiple solutions and I don't recall the one we went with at the end.