"MSB4018 ResolveTargetingPackAssets task failed unexpectedly" after updating to 5.0.103

[henrikse55]

Description

After updating dotnet to 5.0.3 via dnf update, I'm finding myself unable to build any project resulting in the error:

usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018: The "ResolveTargetingPackAssets" task failed unexpectedly.
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018: System.IO.FileNotFoundException: Could not find file '/usr/share/dotnet/packs/Microsoft.NETCore.App.Ref/5.0.0/data/FrameworkList.xml'. [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018: File name: '/usr/share/dotnet/packs/Microsoft.NETCore.App.Ref/5.0.0/data/FrameworkList.xml' [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at Interop.ThrowExceptionForIoErrno(ErrorInfo errorInfo, String path, Boolean isDirectory, Func`2 errorRewriter) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String path, OpenFlags flags, Int32 mode) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.IO.FileStream.OpenHandle(FileMode mode, FileShare share, FileOptions options) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials credentials, IWebProxy proxy) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role, Type ofObjectToReturn) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.Xml.XmlTextReaderImpl.FinishInitUriString() [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.Xml.XmlTextReaderImpl..ctor(String uriStr, XmlReaderSettings settings, XmlParserContext context, XmlResolver uriResolver) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.Xml.XmlReaderSettings.CreateReader(String inputUri, XmlParserContext inputContext) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.Xml.XmlReader.Create(String inputUri, XmlReaderSettings settings) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.Xml.Linq.XDocument.Load(String uri, LoadOptions options) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolveTargetingPackAssets.AddReferencesFromFrameworkList(String frameworkListPath, String targetingPackRoot, String targetingPackDllFolder, ITaskItem targetingPack, List`1 referenceItems) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolveTargetingPackAssets.ExecuteCore() [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at Microsoft.NET.Build.Tasks.TaskBase.Execute() [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute() [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(ITaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask) [/home/henrik/RiderProjects/test/test.csproj]

Configuration

OS: Fedora 33 x64
Dotnet: 5.0.103 via Microsoft repo dnf
Dotnet info which lists all versions I've tried:

.NET SDK (reflecting any global.json):
 Version:   5.0.100
 Commit:    5044b93829

Runtime Environment:
 OS Name:     fedora
 OS Version:  33
 OS Platform: Linux
 RID:         fedora.33-x64
 Base Path:   /usr/share/dotnet/sdk/5.0.100/

Host (useful for support):
  Version: 5.0.3
  Commit:  eae88cc11b

.NET SDKs installed:
  5.0.100 [/usr/share/dotnet/sdk]
  5.0.101 [/usr/share/dotnet/sdk]
  5.0.102 [/usr/share/dotnet/sdk]
  5.0.103 [/usr/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 5.0.0 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.1 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.2 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.3 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 5.0.0 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.1 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.2 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.3 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

Regression?

Initially, I believed this was a dotnet 5.0.103 issue due to it starting after updating to said version but after testing .103 to .100 with all giving the same error, I'm starting to think it might be my system which is acting up (why I'm not sure of)

Other information

I checked the folder which the error refers to and found /usr/share/dotnet/packs/Microsoft.NETCore.App.Ref/5.0.0/data to be empty, no FrameworkList.xml exists.
I've also attempted reinstalling dotnet multiple times clearing dnf cache in-between reinstalls

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

Issue Details

---

Description

After updating dotnet to 5.0.3 via dnf update, I'm finding myself unable to build any project resulting in the error:

usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018: The "ResolveTargetingPackAssets" task failed unexpectedly.
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018: System.IO.FileNotFoundException: Could not find file '/usr/share/dotnet/packs/Microsoft.NETCore.App.Ref/5.0.0/data/FrameworkList.xml'. [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018: File name: '/usr/share/dotnet/packs/Microsoft.NETCore.App.Ref/5.0.0/data/FrameworkList.xml' [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at Interop.ThrowExceptionForIoErrno(ErrorInfo errorInfo, String path, Boolean isDirectory, Func`2 errorRewriter) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String path, OpenFlags flags, Int32 mode) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.IO.FileStream.OpenHandle(FileMode mode, FileShare share, FileOptions options) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials credentials, IWebProxy proxy) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role, Type ofObjectToReturn) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.Xml.XmlTextReaderImpl.FinishInitUriString() [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.Xml.XmlTextReaderImpl..ctor(String uriStr, XmlReaderSettings settings, XmlParserContext context, XmlResolver uriResolver) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.Xml.XmlReaderSettings.CreateReader(String inputUri, XmlParserContext inputContext) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.Xml.XmlReader.Create(String inputUri, XmlReaderSettings settings) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at System.Xml.Linq.XDocument.Load(String uri, LoadOptions options) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolveTargetingPackAssets.AddReferencesFromFrameworkList(String frameworkListPath, String targetingPackRoot, String targetingPackDllFolder, ITaskItem targetingPack, List`1 referenceItems) [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolveTargetingPackAssets.ExecuteCore() [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at Microsoft.NET.Build.Tasks.TaskBase.Execute() [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute() [/home/henrik/RiderProjects/test/test.csproj]
/usr/share/dotnet/sdk/5.0.100/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(324,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(ITaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask) [/home/henrik/RiderProjects/test/test.csproj]

Configuration

OS: Fedora 33 x64
Dotnet: 5.0.103 via Microsoft repo dnf
Dotnet info which lists all versions I've tried:

.NET SDK (reflecting any global.json):
 Version:   5.0.100
 Commit:    5044b93829

Runtime Environment:
 OS Name:     fedora
 OS Version:  33
 OS Platform: Linux
 RID:         fedora.33-x64
 Base Path:   /usr/share/dotnet/sdk/5.0.100/

Host (useful for support):
  Version: 5.0.3
  Commit:  eae88cc11b

.NET SDKs installed:
  5.0.100 [/usr/share/dotnet/sdk]
  5.0.101 [/usr/share/dotnet/sdk]
  5.0.102 [/usr/share/dotnet/sdk]
  5.0.103 [/usr/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 5.0.0 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.1 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.2 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.3 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 5.0.0 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.1 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.2 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.3 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

Regression?

Initially, I believed this was a dotnet 5.0.103 issue due to it starting after updating to said version but after testing .103 to .100 with all giving the same error, I'm starting to think it might be my system which is acting up (why I'm not sure of)

Other information

I checked the folder which the error refers to and found /usr/share/dotnet/packs/Microsoft.NETCore.App.Ref/5.0.0/data to be empty, no FrameworkList.xml exists.
I've also attempted reinstalling dotnet multiple times clearing dnf cache in-between reinstalls

Author:	henrikse55
Assignees:	-
Labels:	area-HostModel, untriaged
Milestone:	-

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[Kampfmoehre]

Downgrading the dotnet-sdk-5.0 package did not work for me, had some other problems then (probably because dotnet-host and other packages where not downgraded). So I resolved this by doing the following:

1. remove any dotnet packages with sudo dnf remove dotnet*
2. disable the Microsoft Prod repo (done this via Software UI)
3. install dotnet-sdk-5.0 (and 3.1 in my case because I still need it in some projects) by running sudo dnf install dotnet-sdk-5.0

Now I am on 5.0.102 and all is working again. Is there a difference between the packages from the microsoft prod repo and the ones from the Fedora Updates repo? Are the fedora ones maintained by Microsoft?

Edit:
I once again removed all packages and reinstalled them again using the ms prod repo. Now everything seems to work fine with the latest version:
sudo dnf install dotnet-sdk-5.0.x86_64 dotnet-sdk-3.1.x86_64 --repo packages-microsoft-com-prod

dotnet --info output:

dotnet --info
.NET SDK (reflecting any global.json):
 Version:   5.0.103
 Commit:    9effbc8ad5

Runtime Environment:
 OS Name:     fedora
 OS Version:  33
 OS Platform: Linux
 RID:         fedora.33-x64
 Base Path:   /usr/share/dotnet/sdk/5.0.103/

Host (useful for support):
  Version: 5.0.3
  Commit:  eae88cc11b

.NET SDKs installed:
  3.1.406 [/usr/share/dotnet/sdk]
  5.0.103 [/usr/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 3.1.12 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.3 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 3.1.12 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.3 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET runtimes or SDKs:
  https://aka.ms/dotnet-download

[henrikse55]

Thanks to @Kampfmoehre solution, dotnet is now working for me again.

It does seem there's a difference between repos.
running dnf repoquery --info --file /usr/share/dotnet/packs/Microsoft.NETCore.App.Ref/5.0.0/data/FrameworkList.xml shows dotnet-targeting-pack-5.0 package from repo packages-microsoft-com-prod provides the missing file even though 2 other repos (update and @system) which also provides the dotnet-targeting-pack-5.0, though who is responsible for those packages I'm not sure as of now.

after a quick test in a fedora docker container, it looks like dnf is favouring the update repo over Microsofts prod repo for some packages so maybe adding a note about --repo to target the correct repo in the installation docs could be practical?

[Hjortsberg]

Running into the same problem, very similar system.

dotnet --info
.NET SDK (reflecting any global.json):
 Version:   5.0.103
 Commit:    9effbc8ad5

Runtime Environment:
 OS Name:     fedora
 OS Version:  33
 OS Platform: Linux
 RID:         fedora.33-x64
 Base Path:   /usr/share/dotnet/sdk/5.0.103/

Host (useful for support):
  Version: 5.0.3
  Commit:  eae88cc11b

.NET SDKs installed:
  3.1.406 [/usr/share/dotnet/sdk]
  5.0.103 [/usr/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 3.1.12 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.3 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 3.1.12 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.3 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET runtimes or SDKs:
  https://aka.ms/dotnet-download

Edit:
Installing all 5 and 3.1 packages from updates repo as described by @Kampfmoehre solved it for me.

[jimfoye]

Ditto.

[Kampfmoehre]

Since sudo dnf upgrade keeps trying to update dotnet packages I temporarely excluded them by editing /etc/yum.repos.d/fedora-updates.repo and adding a line with excludes . Now it looks like:

[updates]
name=Fedora $releasever - $basearch - Updates
#baseurl=http://download.example/pub/fedora/linux/updates/$releasever/Everything/$basearch/
# ...
skip_if_unavailable=False
exclude=aspnetcore* dotnet* netstandard*

[updates-debuginfo]
name=Fedora $releasever - $basearch - Updates - Debug
# ...

I also added this line to /etc/yum.repos.d/fedora.repo:
exclude=dotnet-targeting-pack-3.1 netstandard-targeting-pack-2.1

The problem is, that the packages from the Fedora and Fedora Update Repos have higher version numbers than the ones from the Microsoft Prod Repo so DNF keeps trying to update them. This is leading to having some packages installed from the MS prod repo and some from the Fedora repo which is problematic for Dotnet - especially for Omnisharp used by the C# extension of VS Code.

Can you make the packages the Fedora packages having the same version as in the prod repo? Generally it is good to have them in the Fedora repo for people not needing to add another repo but for people wo want to keep having the latest packages it is also good to have the Microsoft prod repo.

[dleeapho]

@dseefeld @crummel can what @Kampfmoehre suggested about version numbers be done? This seems like yet another manifestation of distro-native / ms feed coexistence dotnet/runtime#47500