0.107.0 LibTorchSharp.dll fails to load (0x8007007F) on Windows x64 + ARM64 due to libtorch 2.10.0 archive header/binary mismatch

[cm4ker]

Hi I faced with issue with version TorchSharp for my project.

Here is a Agent analysis of problem and repro:

TorchSharp 0.107.0 fails to load LibTorchSharp.dll at first API call on both Windows x64 and Windows ARM64, throwing DllNotFoundException with HResult 0x8007007F (ERROR_PROC_NOT_FOUND). The misleading top-level message is "This application or script uses TorchSharp but doesn't contain a reference to libtorch-cpu-win-arm64, Version=2.10.0.0", but the project does reference both TorchSharp 0.107.0 and the matching libtorch-cpu-win-* 2.10.0 NuGet — TorchSharp's loader finds and consolidates them correctly; the OS PE loader is the one refusing the module.

Root cause is an ABI mismatch between the shipped LibTorchSharp.dll and the libtorch 2.10.0 binaries in the libtorch-cpu-win-x64 / libtorch-cpu-win-arm64 NuGet packages. Walking LibTorchSharp.dll's import table and comparing against the export tables of the bundled torch_cpu.dll / c10.dll, 16 imports cannot be resolved. Examples (mangled names omitted, both x64 and ARM64 affected identically):

LibTorchSharp.dll imports	torch_cpu.dll / c10.dll 2.10.0 exports
torch::inductor::AOTIModelPackageLoader(string, string, bool, size_t, DeviceIndex) — 5 args	(string, string, bool) — 3 args
c10::MessageLogger(const char*, int, int, bool) — 4 args	(const char*, int, int) — 3 args
at::Context::allowTF32CuDNN(std::optional) const	at::Context::allowTF32CuDNN() const
at::Context::allowFP16ReductionCuBLAS() const → CuBLASReductionOption	→ bool
GridSampleFuncOptions::mode(variant<kBilinear, kNearest, kBicubic>)	variant<kBilinear, kNearest> (no kBicubic)
caffe2::TypeMeta::toScalarType() const	caffe2::TypeMeta::toScalarType() (non-const)
`c10::*::(try_)?(incref	decref)_pyobjectonTensorImpl/StorageImpl/intrusive_ptr_target`

Reproduce
repro.zip

RID : win-arm64
OS : Microsoft Windows 10.0.26200
.NET : 8.0.27

base dir : C:\Users\cmake\Downloads\repro-torchsharp-arm64\src\bin\Debug\net8.0\win-arm64
native dir : C:\Users\cmake\Downloads\repro-torchsharp-arm64\src\bin\Debug\net8.0\win-arm64
aoti_custom_ops.dll 229 888 bytes
armpl_lp64.dll 37 806 080 bytes
backend_with_compiler.dll 214 016 bytes
c10.dll 1 065 472 bytes
Google.Protobuf.dll 409 368 bytes
ICSharpCode.SharpZipLib.dll 246 272 bytes
jitbackend_test.dll 177 664 bytes
libSkiaSharp.dll 8 084 920 bytes
LibTorchSharp.dll 1 848 760 bytes
Repro.dll 7 168 bytes
SkiaSharp.dll 432 568 bytes
torch.dll 9 728 bytes
torchbind_test.dll 558 080 bytes
TorchSharp.dll 1 556 920 bytes
torch_cpu.dll 105 576 960 bytes
torch_global_deps.dll 9 728 bytes
uv.dll 208 384 bytes

package: libtorch-cpu-win-arm64

Version 0.107.0

README.md

Fill free ping me for more information. Thanks!