Issue with 5.0.4 nuget version in .Net8

[aliaksei-halushkin-idt]

We ran into runtime issue with 5.0.4 Unleash version in .Net8 when loading Unleash in our AspNetCore app

It's Aws Cloudformation deployment

Callstack:
`System.DllNotFoundException: Unable to load shared library 'yggdrasilffi' or one of its dependencies. In order to help diagnose loading problems, consider using a tool like strace. If you're using glibc, consider setting the LD_DEBUG environment variable:
/app/yggdrasilffi.so: cannot open shared object file: No such file or directory
/usr/share/dotnet/shared/Microsoft.NETCore.App/8.0.11/yggdrasilffi.so: cannot open shared object file: No such file or directory
libc.so: cannot open shared object file: No such file or directory
/usr/share/dotnet/shared/Microsoft.NETCore.App/8.0.11/libyggdrasilffi.so: cannot open shared object file: No such file or directory
/app/yggdrasilffi: cannot open shared object file: No such file or directory
/usr/share/dotnet/shared/Microsoft.NETCore.App/8.0.11/yggdrasilffi: cannot open shared object file: No such file or directory
/app/libyggdrasilffi: cannot open shared object file: No such file or directory
/usr/share/dotnet/shared/Microsoft.NETCore.App/8.0.11/libyggdrasilffi: cannot open shared object file: No such file or directory

at Yggdrasil.FFI.new_engine()
at Yggdrasil.FFI.NewEngine()
at Yggdrasil.YggdrasilEngine..ctor(List`1 strategies)
at Unleash.UnleashServices..ctor(UnleashSettings settings, EventCallbackConfig eventConfig, List`1 strategies)
at Unleash.DefaultUnleash..ctor(UnleashSettings settings, IStrategy[] strategies)`

Version 4 works fine (4.1.15 e.g.)

[sighphyre]

Hey @aliaksei-halushkin-idt,

5.0.0 takes on a new native dependency, it looks like that's failing to load for you folks.

What CPU/OS architecture are you running this on?

[sighphyre]

Okay I've been thinking about this overnight. Any chance this is running on an alpine distro? That error message looks a little like libgcc isn't present

[pandrija]

Hi! We are evaluating Uleash, and apparently we run into the same issue:

Unable to load DLL 'yggdrasilffi': The specified module could not be found. (Exception from HRESULT: 0x8007007E)

Pasting just part of the stack trace:
at Yggdrasil.FFI.new_engine()
at Yggdrasil.YggdrasilEngine..ctor(List1 strategies) at Unleash.UnleashServices..ctor(UnleashSettings settings, EventCallbackConfig eventConfig, List1 strategies)

Environment:

• Windows 11 (arm VM on VmWare Fusion on MacOS)
• NET Framework 4.8
• Visual Studio 2022 (17.12.4)
• Installed nuget and set-up per instructions for NET SDK

The fix was to copy yggdrasilffi_x86_64.dll from https://github.com/Unleash/yggdrasil/releases to bin directory of the project and rename it as yggdrasilffi.dll, but I'm not sure what to do next, as I'm about to deploy this to one of our test environments, so any suggestion is welcome. Thx!

[sighphyre]

Hey @pandrija, I'm pretty sure what you're describing is a different issue. The original looks to be a linker issue while your sounds a bit more like VM emulation going awry.

To be clear, you're running this on a Windows arm VM and a x86_64 binary worked? Did you by any chance build this on a different platform from the one you tested on?

What's the environment you're planning to deploy this to?

[pandrija]

Hi @sighphyre - thank you for prompt reply!

I'm working on Windows 11 Arm64 on Arm MacOs (M4) and I'm installing mostly x86_64 apps, and they all work through Windows emulation I guess. My Visual Studio project target is set to "Any CPU" and I'm testing locally in IIS bound to my work directory, which is pretty much standard setup for us. When I got the error, I tried with both versions of dll: yggdrasilffi_arm64 & yggdrasilffi_x86_64 and only the latter worked. For the other I got "wrong architecture" error. Without copying the dll I get the error I pasted.

We would be deploying this to x86_64 Windows Server VMs.

[pandrija]

Hi @sighphyre - we have reproduced the same issue on a coworkers laptop that has basic x86_64 Windows, so I guess it's not due to arm. I created another project to test Unleash, that uses NET9 (on MacOS arm host), and it runs without issues, but I was able to find yggdrasilffi.dll in runtimes subfolders of bin/Debug/net9.0. However, on NET Framework 4.8 project, yggdrasilffi.dll is nowhere to see in the bin folder (unless I copy it manually). Please advise - we are currently blocked from further rollout. Thx!