GC events appear to be broken with NativeAOT

[mrvoorhe]

Description

When I switched IL2CPP to be compiled with NativeAOT, our GC event tracking logic stopped working. I pulled the code out into a repro project and as far as I can tell the GC events are no longer firing with NativeAOT.

Reproduction Steps

1. Check out the repro project here https://github.com/mrvoorhe/NativeAOTGCEventsRepro

2. dotnet publish

3. GCEventsTest\bin\Debug\net7.0\win-x64\publish\GCEventsTest.exe

Expected behavior

Got Event Source
Got Event Source
Hello, World!
Got Event Source
GC - Gen 0
GC End - Gen - 0
GC - Gen 1
GC End - Gen - 1
GC - Gen 0
GC End - Gen - 0
GC - Gen 0
GC End - Gen - 0
GC - Gen 0
GC End - Gen - 0
GC - Gen 2
GC End - Gen - 2
Done
Got Event Source

Actual behavior

Hello, World!
Done

Regression?

No response

Known Workarounds

No response

Configuration

7.0.100

Windows 11

x64

It is specific to NativeAOT. I did not test NativeAOT on Linux.

Other information

I found this a little interesting, not sure if it really is.

Once you add <PublishAot>true</PublishAot> to your csproj, running dotnet run will produce the bad output

Hello, World!
Done

Add <EventSourceSupport>true</EventSourceSupport> to the project and run dotnet run again, and you get the expected output.

Got Event Source
Got Event Source
Hello, World!
Got Event Source
GC - Gen 0
GC End - Gen - 0
GC - Gen 1
GC End - Gen - 1
GC - Gen 0
GC End - Gen - 0
GC - Gen 0
GC End - Gen - 0
GC - Gen 0
GC End - Gen - 0
Done
Got Event Source

[ghost]

Tagging subscribers to this area: @agocke, @MichalStrehovsky, @jkotas
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Issue Details

---

Description

When I switched IL2CPP to be compiled with NativeAOT, our GC event tracking logic stopped working. I pulled the code out into a repro project and as far as I can tell the GC events are no longer firing with NativeAOT.

Reproduction Steps

1. Check out the repro project here https://github.com/mrvoorhe/NativeAOTGCEventsRepro

2. dotnet publish

3. GCEventsTest\bin\Debug\net7.0\win-x64\publish\GCEventsTest.exe

Expected behavior

Got Event Source
Got Event Source
Hello, World!
Got Event Source
GC - Gen 0
GC End - Gen - 0
GC - Gen 1
GC End - Gen - 1
GC - Gen 0
GC End - Gen - 0
GC - Gen 0
GC End - Gen - 0
GC - Gen 0
GC End - Gen - 0
GC - Gen 2
GC End - Gen - 2
Done
Got Event Source

Actual behavior

Hello, World!
Done

Regression?

No response

Known Workarounds

No response

Configuration

7.0.100

Windows 11

x64

It is specific to NativeAOT. I did not test NativeAOT on Linux.

Other information

I found this a little interesting, not sure if it really is.

Once you add <PublishAot>true</PublishAot> to your csproj, running dotnet run will produce the bad output

Hello, World!
Done

Add <EventSourceSupport>true</EventSourceSupport> to the project and run dotnet run again, and you get the expected output.

Got Event Source
Got Event Source
Hello, World!
Got Event Source
GC - Gen 0
GC End - Gen - 0
GC - Gen 1
GC End - Gen - 1
GC - Gen 0
GC End - Gen - 0
GC - Gen 0
GC End - Gen - 0
GC - Gen 0
GC End - Gen - 0
Done
Got Event Source

Author:	mrvoorhe
Assignees:	-
Labels:	area-NativeAOT-coreclr
Milestone:	-

[jkotas]

cc @LakshanF

[jkotas]

EventSource and EventPipe tracing is not enabled for NativeAOT in .NET 7. It is being worked on for .NET 8: #79241

[agocke]

Closing as dup of #79241