'The "Microsoft.DotNet.Compatibility.ValidatePackage" task failed unexpectedly' in libs legs

[am11]

Logs from Build Linux x64 release SourceBuild: https://dev.azure.com/dnceng/public/_build/results?buildId=1400355&view=logs&jobId=000ba8e3-34f8-51d2-8d06-9b61f10256d0&j=000ba8e3-34f8-51d2-8d06-9b61f10256d0&t=ca9b6e26-8c16-57f9-673e-2bc0dc655f25

 /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018: The "Microsoft.DotNet.Compatibility.ValidatePackage" task failed unexpectedly. [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018: System.TypeLoadException: Method 'CompareSourceLocations' in type 'Microsoft.CodeAnalysis.CSharp.CSharpCompilation' from assembly 'Microsoft.CodeAnalysis.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' does not have an implementation. [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.DotNet.ApiCompatibility.AssemblySymbolLoader..ctor(Boolean resolveAssemblyReferences) [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.DotNet.PackageValidation.ApiCompatRunner.GetAssemblySymbolFromStream(Stream assemblyStream, MetadataInformation assemblyInformation, Boolean& resolvedReferences) in /_/src/Compatibility/Microsoft.DotNet.PackageValidation/ApiCompatRunner.cs:line 111 [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.DotNet.PackageValidation.ApiCompatRunner.RunApiCompat() in /_/src/Compatibility/Microsoft.DotNet.PackageValidation/ApiCompatRunner.cs:line 49 [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.DotNet.PackageValidation.CompatibleFrameworkInPackageValidator.Validate(Package package) in /_/src/Compatibility/Microsoft.DotNet.PackageValidation/CompatibleFrameworkInPackageValidator.cs:line 62 [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.DotNet.Compatibility.ValidatePackage.ExecuteCore() in /_/src/Compatibility/Microsoft.DotNet.Compatibility/ValidatePackage.cs:line 92 [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.NET.Build.Tasks.TaskBase.Execute() in /_/src/Tasks/Common/TaskBase.cs:line 38 [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.DotNet.Compatibility.ValidatePackage.Execute() in /_/src/Compatibility/Microsoft.DotNet.Compatibility/ValidatePackage.cs:line 49 [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute() [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(ITaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask) [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
    System.Security.Cryptography.X509Certificates -> /__w/1/s/artifacts/source-build/self/src/artifacts/bin/System.Security.Cryptography.X509Certificates/net7.0-Unix-Release/System.Security.Cryptography.X509Certificates.dll

Runfo Tracking Issue: Microsoft.DotNet.Compatibility.ValidatePackage failing

Definition	Build	Kind	Job Name
runtime	1403534	PR 57398	Libraries Build windows allConfigurations x64 Debug
runtime	1403534	PR 57398	Libraries Build windows allConfigurations x64 Debug
runtime	1403534	PR 57398	Libraries Build windows allConfigurations x64 Debug
runtime	1403381	PR 59992	Libraries Build windows allConfigurations x64 Debug
runtime	1403381	PR 59992	Libraries Build windows allConfigurations x64 Debug
runtime	1403056	Rolling	Libraries Build windows allConfigurations x64 Release
runtime	1403056	Rolling	Libraries Build windows allConfigurations x64 Release
runtime	1402102	PR 59969	Libraries Build windows allConfigurations x64 Debug
runtime	1402102	PR 59969	Libraries Build windows allConfigurations x64 Debug
runtime	1402102	PR 59969	Libraries Build windows allConfigurations x64 Debug
runtime	1402102	PR 59969	Libraries Build windows allConfigurations x64 Debug
runtime	1402102	PR 59969	Libraries Build windows allConfigurations x64 Debug
runtime	1401747	PR 59767	Libraries Build windows allConfigurations x64 Debug
runtime	1401747	PR 59767	Libraries Build windows allConfigurations x64 Debug
runtime	1401747	PR 59767	Libraries Build windows allConfigurations x64 Debug
runtime	1401747	PR 59767	Libraries Build windows allConfigurations x64 Debug
runtime	1401651	PR 59579	Libraries Build windows allConfigurations x64 Debug
runtime	1401651	PR 59579	Libraries Build windows allConfigurations x64 Debug
runtime	1401651	PR 59579	Libraries Build windows allConfigurations x64 Debug
runtime	1401651	PR 59579	Libraries Build windows allConfigurations x64 Debug
runtime	1400858	PR 59846	Libraries Build windows allConfigurations x64 Debug
runtime	1400858	PR 59846	Libraries Build windows allConfigurations x64 Debug
runtime	1400858	PR 59846	Libraries Build windows allConfigurations x64 Debug
runtime	1400838	PR 59915	Libraries Build windows allConfigurations x64 Debug
runtime	1400838	PR 59915	Libraries Build windows allConfigurations x64 Debug
runtime	1400838	PR 59915	Libraries Build windows allConfigurations x64 Debug
runtime	1400838	PR 59915	Libraries Build windows allConfigurations x64 Debug
runtime	1400838	PR 59915	Libraries Build windows allConfigurations x64 Debug
runtime	1400529	PR 59914	Libraries Build windows allConfigurations x64 Debug
runtime	1400529	PR 59914	Libraries Build windows allConfigurations x64 Debug
runtime	1400529	PR 59914	Libraries Build windows allConfigurations x64 Debug
runtime	1400490	PR 59847	Libraries Build windows allConfigurations x64 Debug
runtime	1400490	PR 59847	Libraries Build windows allConfigurations x64 Debug
runtime	1400490	PR 59847	Libraries Build windows allConfigurations x64 Debug
runtime	1400490	PR 59847	Libraries Build windows allConfigurations x64 Debug
runtime	1400452	Rolling	Libraries Build windows allConfigurations x64 Release
runtime	1400452	Rolling	Libraries Build windows allConfigurations x64 Release
runtime	1400452	Rolling	Libraries Build windows allConfigurations x64 Release
runtime	1400452	Rolling	Libraries Build windows allConfigurations x64 Release
runtime	1400431	PR 59905	Libraries Build windows allConfigurations x64 Debug
runtime	1400431	PR 59905	Libraries Build windows allConfigurations x64 Debug
runtime	1400431	PR 59905	Libraries Build windows allConfigurations x64 Debug
runtime	1400431	PR 59905	Libraries Build windows allConfigurations x64 Debug
runtime	1400119	PR 59905	Libraries Build windows allConfigurations x64 Debug
runtime	1400119	PR 59905	Libraries Build windows allConfigurations x64 Debug
runtime	1400119	PR 59905	Libraries Build windows allConfigurations x64 Debug
runtime	1400119	PR 59905	Libraries Build windows allConfigurations x64 Debug

Build Result Summary

Day Hit Count	Week Hit Count	Month Hit Count
0	0	13

Tagging subscribers to this area: @vitek-karas, @agocke
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Logs from https://dev.azure.com/dnceng/public/_build/results?buildId=1400355&view=logs&jobId=000ba8e3-34f8-51d2-8d06-9b61f10256d0&j=000ba8e3-34f8-51d2-8d06-9b61f10256d0&t=ca9b6e26-8c16-57f9-673e-2bc0dc655f25

 /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018: The "Microsoft.DotNet.Compatibility.ValidatePackage" task failed unexpectedly. [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018: System.TypeLoadException: Method 'CompareSourceLocations' in type 'Microsoft.CodeAnalysis.CSharp.CSharpCompilation' from assembly 'Microsoft.CodeAnalysis.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' does not have an implementation. [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.DotNet.ApiCompatibility.AssemblySymbolLoader..ctor(Boolean resolveAssemblyReferences) [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.DotNet.PackageValidation.ApiCompatRunner.GetAssemblySymbolFromStream(Stream assemblyStream, MetadataInformation assemblyInformation, Boolean& resolvedReferences) in /_/src/Compatibility/Microsoft.DotNet.PackageValidation/ApiCompatRunner.cs:line 111 [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.DotNet.PackageValidation.ApiCompatRunner.RunApiCompat() in /_/src/Compatibility/Microsoft.DotNet.PackageValidation/ApiCompatRunner.cs:line 49 [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.DotNet.PackageValidation.CompatibleFrameworkInPackageValidator.Validate(Package package) in /_/src/Compatibility/Microsoft.DotNet.PackageValidation/CompatibleFrameworkInPackageValidator.cs:line 62 [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.DotNet.Compatibility.ValidatePackage.ExecuteCore() in /_/src/Compatibility/Microsoft.DotNet.Compatibility/ValidatePackage.cs:line 92 [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.NET.Build.Tasks.TaskBase.Execute() in /_/src/Tasks/Common/TaskBase.cs:line 38 [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.DotNet.Compatibility.ValidatePackage.Execute() in /_/src/Compatibility/Microsoft.DotNet.Compatibility/ValidatePackage.cs:line 49 [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute() [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(ITaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask) [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
    System.Security.Cryptography.X509Certificates -> /__w/1/s/artifacts/source-build/self/src/artifacts/bin/System.Security.Cryptography.X509Certificates/net7.0-Unix-Release/System.Security.Cryptography.X509Certificates.dll

Author:	am11
Assignees:	-
Labels:	area-HostModel, untriaged
Milestone:	-

Tagging subscribers to this area: @Anipik, @safern, @ViktorHofer
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Logs from Build Linux x64 release SourceBuild: https://dev.azure.com/dnceng/public/_build/results?buildId=1400355&view=logs&jobId=000ba8e3-34f8-51d2-8d06-9b61f10256d0&j=000ba8e3-34f8-51d2-8d06-9b61f10256d0&t=ca9b6e26-8c16-57f9-673e-2bc0dc655f25

 /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018: The "Microsoft.DotNet.Compatibility.ValidatePackage" task failed unexpectedly. [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018: System.TypeLoadException: Method 'CompareSourceLocations' in type 'Microsoft.CodeAnalysis.CSharp.CSharpCompilation' from assembly 'Microsoft.CodeAnalysis.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' does not have an implementation. [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.DotNet.ApiCompatibility.AssemblySymbolLoader..ctor(Boolean resolveAssemblyReferences) [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.DotNet.PackageValidation.ApiCompatRunner.GetAssemblySymbolFromStream(Stream assemblyStream, MetadataInformation assemblyInformation, Boolean& resolvedReferences) in /_/src/Compatibility/Microsoft.DotNet.PackageValidation/ApiCompatRunner.cs:line 111 [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.DotNet.PackageValidation.ApiCompatRunner.RunApiCompat() in /_/src/Compatibility/Microsoft.DotNet.PackageValidation/ApiCompatRunner.cs:line 49 [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.DotNet.PackageValidation.CompatibleFrameworkInPackageValidator.Validate(Package package) in /_/src/Compatibility/Microsoft.DotNet.PackageValidation/CompatibleFrameworkInPackageValidator.cs:line 62 [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.DotNet.Compatibility.ValidatePackage.ExecuteCore() in /_/src/Compatibility/Microsoft.DotNet.Compatibility/ValidatePackage.cs:line 92 [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.NET.Build.Tasks.TaskBase.Execute() in /_/src/Tasks/Common/TaskBase.cs:line 38 [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.DotNet.Compatibility.ValidatePackage.Execute() in /_/src/Compatibility/Microsoft.DotNet.Compatibility/ValidatePackage.cs:line 49 [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute() [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
  /__w/1/s/artifacts/source-build/self/package-cache/microsoft.dotnet.compatibility/1.0.0-rc.1.21459.41/build/Microsoft.NET.Compatibility.Common.targets(32,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(ITaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask) [/__w/1/s/artifacts/source-build/self/src/src/libraries/System.Runtime.CompilerServices.Unsafe/src/System.Runtime.CompilerServices.Unsafe.ilproj]
    System.Security.Cryptography.X509Certificates -> /__w/1/s/artifacts/source-build/self/src/artifacts/bin/System.Security.Cryptography.X509Certificates/net7.0-Unix-Release/System.Security.Cryptography.X509Certificates.dll

Author:	am11
Assignees:	-
Labels:	area-Infrastructure-libraries, source-build, untriaged
Milestone:	-

[am11]

Not source-build specific, failed again in Linux x64 debug Libraries_AllConfigurations:

• https://dev.azure.com/dnceng/public/_build/results?buildId=1400066&view=logs&jobId=9857eb29-0e94-5117-8263-c465d2f22cda&j=9857eb29-0e94-5117-8263-c465d2f22cda&t=361b7342-f961-58ea-ced7-17ed6b18c962
• https://dev.azure.com/dnceng/public/_build/results?buildId=1400427&view=logs&jobId=833f538a-ed58-511b-3c52-f2ba7b5799bd&j=833f538a-ed58-511b-3c52-f2ba7b5799bd&t=416c8fb5-e98c-5538-8919-f35da5198b2e

[safern]

Seems like a Roslyn update could've broken the package validation task? I will try to repro locally tomorrow.

cc: @Anipik @ericstj

[ericstj]

Abstract member added here? dotnet/roslyn@7f5a439

Is it possible we're loading old derived class and newer base class? cc @sharwell