Crash when loading a model the 2nd time after recreating OgaHandle

[Zagusan]

Describe the bug

Creating an OgaHandle, loading a model, deleting both of them, and creating a new OgaHandle causes a crash. This happens in both C# and C++.

To Reproduce

Steps to reproduce the behavior:

1. Create an OgaHandle
2. Load any model (I'm using this one with a chat template manually added to tokenizer_config.json)
3. Destroy or dispose the model
4. Destroy or dispose the OgaHandle
5. Create a new OgaHandle
6. Load any model again

The crash doesn't happen if a model isn't loaded before destroying the OgaHandle. It also happens with the Deepseek Qwen distills and it also doesn't matter if the model was used for generation.

You may use the code in this repository.

Expected behavior

Since OgaHandle is essential for cleaning up resources, it should allow for loading another model after destroying and recreating it

Environment

• OS: Windows 11 23H2
• Device: CPU
• OGA version: 11.2 (downloaded through NuGet)
• ONNX Runtime version: 1.23.2

Additional context

C# error:

Exception thrown at 0x00007FFFC52F593C (onnxruntime-genai.dll) in OgaHandleRepro.exe: 0xC0000005: Access violation reading location 0x0000000000000000.

C# stack trace:

onnxruntime-genai.dll!00007fff9dcb593c()	Unknown
onnxruntime-genai.dll!00007fff9dd10d2b()	Unknown
[Managed to Native Transition]	
Microsoft.ML.OnnxRuntimeGenAI.dll!Microsoft.ML.OnnxRuntimeGenAI.Model.Model(Microsoft.ML.OnnxRuntimeGenAI.Config config)	Unknown
OgaHandleRepro.dll!Repro.Program.LoadRandomGPT2() Line 33	C#
OgaHandleRepro.dll!Repro.Program.Main(string[] args) Line 55	C#
[Native to Managed Transition]	
hostpolicy.dll!00007fffa015da9a()	Unknown
hostpolicy.dll!00007fffa015dd3c()	Unknown
hostpolicy.dll!00007fffa015ecb1()	Unknown
hostfxr.dll!00007fffa449d56b()	Unknown
hostfxr.dll!00007fffa44a029c()	Unknown
hostfxr.dll!00007fffa44a2676()	Unknown
hostfxr.dll!00007fffa44a079d()	Unknown
hostfxr.dll!00007fffa4498998()	Unknown
OgaHandleRepro.exe!00007ff7c7b12dec()	Unknown
OgaHandleRepro.exe!00007ff7c7b13256()	Unknown
OgaHandleRepro.exe!00007ff7c7b22548()	Unknown
kernel32.dll!00007ff89380259d()	Unknown
ntdll.dll!00007ff894a8af78()	Unknown

C++ error:

Unhandled exception at 0x00007FF89204055C in OgaHandleRepro.exe: Microsoft C++ exception: std::runtime_error at memory location 0x00000068F391F4D8.

C++ stack trace:

onnxruntime-genai.dll!00007fffaad4593c()	Unknown
onnxruntime-genai.dll!00007fffaada0d2b()	Unknown
OgaHandleRepro.exe!OgaModel::Create(const OgaConfig & config) Line 240	C++
OgaHandleRepro.exe!LoadRandomGPT2() Line 33	C++
OgaHandleRepro.exe!main() Line 54	C++
OgaHandleRepro.exe!invoke_main() Line 79	C++
OgaHandleRepro.exe!__scrt_common_main_seh() Line 288	C++
OgaHandleRepro.exe!__scrt_common_main() Line 331	C++
OgaHandleRepro.exe!mainCRTStartup(void * __formal) Line 17	C++
kernel32.dll!00007ff89380259d()	Unknown
ntdll.dll!00007ff894a8af78()	Unknown