[BUG]: dll not found issue after 1st august

[mrn06ody]

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• I searched for existing GitHub issues
• I read pipeline troubleshooting guide
• I checked how to collect logs

Task name

DotNetCoreCLI

Task version

2

Issue Description

A bug happened!

After Azure team removed .NET 6 from hosted machines, running test task fails. Nothing changed from our side. Azure machine cannot find a dll of shared library. See the logs below.

Also rerunning old successful CI pipelines ends in failure

Environment type (Please select at least one enviroment where you face this issue)

• Self-Hosted
• Microsoft Hosted
• VMSS Pool
• Container

Azure DevOps Server type

dev.azure.com (formerly visualstudio.com)

Azure DevOps Server Version (if applicable)

No response

Operation system

ubuntu-22.04

Relevant log output

Error Message:
   System.DllNotFoundException : Unable to load shared library 'MathFunctionsExL' 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: 
/usr/share/dotnet/shared/Microsoft.NETCore.App/9.0.4/MathFunctionsExL.so: cannot open shared object file: No such file or directory
/home/vsts/work/1/s/Tests/DOST.Domain.Tests/bin/Release/net9.0/MathFunctionsExL.so: cannot open shared object file: No such file or directory
/usr/share/dotnet/shared/Microsoft.NETCore.App/9.0.4/libMathFunctionsExL.so: cannot open shared object file: No such file or directory
libnethost.so: cannot open shared object file: No such file or directory
/usr/share/dotnet/shared/Microsoft.NETCore.App/9.0.4/MathFunctionsExL: cannot open shared object file: No such file or directory
/home/vsts/work/1/s/Tests/DOST.Domain.Tests/bin/Release/net9.0/MathFunctionsExL: cannot open shared object file: No such file or directory
/usr/share/dotnet/shared/Microsoft.NETCore.App/9.0.4/libMathFunctionsExL: cannot open shared object file: No such file or directory
/home/vsts/work/1/s/Tests/DOST.Domain.Tests/bin/Release/net9.0/libMathFunctionsExL: cannot open shared object file: No such file or directory

  Stack Trace:
     at Aran.NativeOperations.MathFunctionsEx.StartL(String runtimeConfigPath, String path, String userSerial, String userKey, IntPtr retUserSerialPtr)
   at Aran.NativeOperations.MathFunctionsEx.StartLinux(String sA, String sB, String& sC)
   at Aran.NativeOperations.MathFunctionsEx.Load(String& result)
   at DOST.Domain.Test.RequestTest..ctor() in /home/vsts/work/1/s/Tests/DOST.Domain.Tests/RequestTest.cs:line 25
   at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean wrapExceptions)

Full task logs with system.debug enabled

   Error Message:
   System.DllNotFoundException : Unable to load shared library 'MathFunctionsExL' 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: 
/usr/share/dotnet/shared/Microsoft.NETCore.App/9.0.4/MathFunctionsExL.so: cannot open shared object file: No such file or directory
/home/vsts/work/1/s/Tests/DOST.Domain.Tests/bin/Release/net9.0/MathFunctionsExL.so: cannot open shared object file: No such file or directory
/usr/share/dotnet/shared/Microsoft.NETCore.App/9.0.4/libMathFunctionsExL.so: cannot open shared object file: No such file or directory
libnethost.so: cannot open shared object file: No such file or directory
/usr/share/dotnet/shared/Microsoft.NETCore.App/9.0.4/MathFunctionsExL: cannot open shared object file: No such file or directory
/home/vsts/work/1/s/Tests/DOST.Domain.Tests/bin/Release/net9.0/MathFunctionsExL: cannot open shared object file: No such file or directory
/usr/share/dotnet/shared/Microsoft.NETCore.App/9.0.4/libMathFunctionsExL: cannot open shared object file: No such file or directory
/home/vsts/work/1/s/Tests/DOST.Domain.Tests/bin/Release/net9.0/libMathFunctionsExL: cannot open shared object file: No such file or directory
Stack Trace:

at Aran.NativeOperations.MathFunctionsEx.StartL(String runtimeConfigPath, String path, String userSerial, String userKey, IntPtr retUserSerialPtr)

at Aran.NativeOperations.MathFunctionsEx.StartLinux(String sA, String sB, String& sC)

at Aran.NativeOperations.MathFunctionsEx.Load(String& result)

at DOST.Domain.Test.RequestTest..ctor() in /home/vsts/work/1/s/Tests/DOST.Domain.Tests/RequestTest.cs:line 25

at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean wrapExceptions) 

Repro steps

- job: build_cross_platform_services_job
            displayName: Build cross platform services Job
            pool:
                vmImage: ubuntu-22.04
            steps:
                - checkout: self
                  submodules: recursive
                - task: NuGetAuthenticate@1
                  displayName: NuGet Authenticate
                - task: DotNetCoreCLI@2
                  displayName: Build cross platform services
                  inputs:
                      command: build
                      projects: ./DOST.sln
                      arguments: --configuration Release
                      verbosityRestore: Detailed
                      verbosityPack: Detailed
                      feedsToUse: 'config'
                      nugetConfigPath: './nuget.config'
                - task: DotNetCoreCLI@2
                  displayName: Run tests
                  inputs:
                      command: test
                      projects: '**/*Tests/*.csproj'
                      arguments: --configuration Release

[raujaiswal]

Hello @mrn06ody,
Thank you for reaching out to us. We appreciate your message and the opportunity to assist you.

As per latest announcement, .NET6 has been removed from Windows and Ubuntu from 2025-08-01.

To continue using .NET 6 in your Azure Pipelines, we recommend leveraging the UseDotNet@2 task, which allows you to install specific .NET versions during pipeline execution.

[mrn06ody]

Hello @mrn06ody, Thank you for reaching out to us. We appreciate your message and the opportunity to assist you.

As per latest announcement, .NET6 has been removed from Windows and Ubuntu from 2025-08-01.

To continue using .NET 6 in your Azure Pipelines, we recommend leveraging the UseDotNet@2 task, which allows you to install specific .NET versions during pipeline execution.

Thank you for your response. But we are using .NET 9, sorry I just forgot to mention it. The reason why I mentioned .NET 6 was because the error occurred on the same day that you removed .NET 6.

[mrn06ody]

Also rerunning old successful CI pipelines ends in failure

Just a reminder

[mrn06ody]

any news on this?

[raujaiswal]

Hello @mrn06ody ,
Thank you for your support, to help us investigate further, could you please share the following details?

When the pipeline was successful:

• Agent Version:
• Image Version:
• DotNetCoreCli2 Version:

When the pipeline was failing:

• Agent Version:
• Image Version:
• DotNetCoreCli2 Version:

[mrn06ody]

No any pipeline becomes successful since 1st august.

Project's dotnet version is 9. Image version is ubuntu-22.04 (as mentioned in the description). I hope you wanted to get this info from me)