[BUG]: System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

[XxEeNnXxEeIi]

Description

Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Repeat 2 times:

at LLama.Native.NativeApi.llama_backend_init()

at LLama.Native.NativeApi..cctor()
at LLama.Native.NativeApi.llama_max_devices()
at LLama.Native.NativeApi.llama_max_devices()
at LLama.Abstractions.TensorSplitsCollection..ctor()
at LLama.Common.ModelParams..ctor(System.String)
at DemoApi.Services.GgufModelService+d__19.MoveNext()
at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](System.__Canon ByRef)
at DemoApi.Services.GgufModelService.LoadAsync(System.String, System.Threading.CancellationToken)
at DemoApi.Services.GgufModelService.EnsureLoadedAsync(System.Threading.CancellationToken)
at Program+<

$>d__0.MoveNext()
at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](System.__Canon ByRef)
at Program.$(System.String[])
at Program.(System.String[])

Reproduction Steps

Title: 🚨 Fatal System.AccessViolationException on x64 CPU backend with .NET 8

Description:
Running the Demo_net8_Onnx project with LlamaSharp CPU backend (no AVX) on Intel 11th Gen CPUs crashes immediately with a System.AccessViolationException. This happens on .NET 8 (x64) on Windows 10/11. The crash occurs before any inference, making the demo completely unusable.

Steps to Reproduce:

Clone the repository:

git clone
cd Demo_Net8_Onnx

Ensure .NET 8 SDK is installed:

dotnet --version # Should show 8.0.x

Restore NuGet packages:

dotnet restore Demo_net8_Onnx.csproj

Confirm project references include:

Build and run targeting x64:

dotnet build -r win-x64 Demo_net8_Onnx\Demo_net8_Onnx.csproj
dotnet run -r win-x64 --project Demo_net8_Onnx\Demo_net8_Onnx.csproj

Observe the crash:

Fatal error. System.AccessViolationException: Attempted to read or write protected memory...

Expected Behavior:
The demo should run successfully on CPU without AVX support.

Environment:

CPU: Intel 11th Gen

OS: Windows 10/11 x64

.NET SDK: 8.0.x

LlamaSharp Backend: CPU (no AVX)

Notes:

Crash happens instantly, even with a minimal setup.

Works only if a non-CPU backend is used or if AVX is enabled (untested).

Environment & Configuration

• Operating system:
• .NET runtime version:
• LLamaSharp version:
• CUDA version (if you are using cuda backend):
• CPU & GPU device:

Known Workarounds

No response

[SignalRT]

1. Which model are you using?
2. Does it work correctly if you use that model directly with llama.cpp?”