CI error on WASI on 8.0: libxml2.so.2: cannot open shared object file: No such file or directory

[svick]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1439242
Build error leg or test failing: Wasi.Build.Tests.WasiTemplateTests.ConsolePublishAndRunForSingleFileBundle
Pull request: #126495

Error Message

DO NOT USE JSON BELOW IF THIS IS A BUILD BREAK otherwise build analysis will allow pull requests to merge that break the build worse. For a build break, do not use this issue form. Make a regular new issue.

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": "libxml2.so.2: cannot open shared object file: No such file or directory",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

    Wasi.Build.Tests.WasiTemplateTests.ConsolePublishAndRunForSingleFileBundle(config: "Debug", relinking: False, invariantTimezone: False) [FAIL]
      Build process exited with non-zero exit code: 1
      Stack Trace:
        /_/src/mono/wasi/Wasi.Build.Tests/BuildTestBase.cs(433,0): at Wasm.Build.Tests.BuildTestBase.AssertBuild(String args, String label, Boolean expectSuccess, IDictionary`2 envVars, Nullable`1 timeoutMs)
        /_/src/mono/wasi/Wasi.Build.Tests/BuildTestBase.cs(245,0): at Wasm.Build.Tests.BuildTestBase.BuildProject(BuildArgs buildArgs, String id, BuildProjectOptions options)
        /_/src/mono/wasi/Wasi.Build.Tests/WasiTemplateTests.cs(108,0): at Wasi.Build.Tests.WasiTemplateTests.ConsolePublishAndRunForSingleFileBundle(String config, Boolean relinking, Boolean invariantTimezone)
           at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
           at System.Reflection.MethodBaseInvoker.InvokeDirectByRefWithFewArgs(Object obj, Span`1 copyOfArgs, BindingFlags invokeAttr)
      Output:
        [] Executing (Captured Output) - /root/helix/work/workitem/e/dotnet-latest/dotnet new wasiconsole  -  in pwd /root/helix/work/workitem/e/wbt artifacts/Debug_mopmctri_pcl
        [] The template "Wasi Console App" was created successfully.
        [] 
        -------- Building ---------
        Binlog path: /root/helix/work/workitem/uploads/xharness-output/logs/Debug_mopmctri_pcl/Debug_mopmctri_pcl.binlog
        Building Debug_mopmctri_pcl in /root/helix/work/workitem/e/wbt artifacts/Debug_mopmctri_pcl
        Running /root/helix/work/workitem/e/dotnet-latest/dotnet publish -p:WasmBuildOnlyAfterPublish=true  /p:Configuration=Debug /bl:"/root/helix/work/workitem/uploads/xharness-output/logs/Debug_mopmctri_pcl/Debug_mopmctri_pcl.binlog" /nologo /v:minimal
        WorkingDirectory: /root/helix/work/workitem/e/wbt artifacts/Debug_mopmctri_pcl
        Setting environment variables for execution:
        	DOTNET_ROOT = /root/helix/work/workitem/e/dotnet-latest
        	DOTNET_INSTALL_DIR = /root/helix/work/workitem/e/dotnet-latest
        	DOTNET_MULTILEVEL_LOOKUP = 0
        	DOTNET_SKIP_FIRST_TIME_EXPERIENCE = 1
        	PATH = /root/helix/work/workitem/e/dotnet-latest:./dotnet-latest:/root/helix/work/correlation/dotnet-latest:/root/helix/work/correlation/xharness-cli:/root/helix/work/correlation/dotnet-cli:/root/helix/work/correlation/wasi-sdk:/root/helix/work/correlation/wasmtime:/home/helixbot/.jsvu/bin:/home/helixbot/.vsts-env/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
        	EM_WORKAROUND_PYTHON_BUG_34780 = 1
        	WASI_SDK_PATH = /root/helix/work/correlation/build/wasi-sdk
        	NUGET_PACKAGES = /root/helix/work/workitem/e/wbt artifacts/nuget/Debug_mopmctri_pcl
        [Debug_mopmctri_pcl]   Determining projects to restore...
        [Debug_mopmctri_pcl]   Restored /root/helix/work/workitem/e/wbt artifacts/Debug_mopmctri_pcl/Debug_mopmctri_pcl.csproj (in 638 ms).
        [Debug_mopmctri_pcl]   Debug_mopmctri_pcl -> /root/helix/work/workitem/e/wbt artifacts/Debug_mopmctri_pcl/bin/Debug/net8.0/wasi-wasm/Debug_mopmctri_pcl.dll
        [Debug_mopmctri_pcl]   ** MicrosoftNetCoreAppRuntimePackDir : '/root/helix/work/workitem/e/dotnet-latest/packs/Microsoft.NETCore.App.Runtime.Mono.wasi-wasm/8.0.28'
        [Debug_mopmctri_pcl]   Optimizing assemblies for size. This process might take a while.
        [Debug_mopmctri_pcl]   Debug_mopmctri_pcl -> /root/helix/work/workitem/e/wbt artifacts/Debug_mopmctri_pcl/bin/Debug/net8.0/wasi-wasm/publish/
        [Debug_mopmctri_pcl]   Debug_mopmctri_pcl -> /root/helix/work/workitem/e/wbt artifacts/Debug_mopmctri_pcl/bin/Debug/net8.0/wasi-wasm/Debug_mopmctri_pcl.dll
        [Debug_mopmctri_pcl]   ** MicrosoftNetCoreAppRuntimePackDir : '/root/helix/work/workitem/e/dotnet-latest/packs/Microsoft.NETCore.App.Runtime.Mono.wasi-wasm/8.0.28'
        [Debug_mopmctri_pcl]   Debug_mopmctri_pcl -> /root/helix/work/workitem/e/wbt artifacts/Debug_mopmctri_pcl/bin/Debug/net8.0/wasi-wasm/publish/
        [Debug_mopmctri_pcl]   MicrosoftNetCoreAppRuntimePackRidNativeDir: /root/helix/work/workitem/e/dotnet-latest/packs/Microsoft.NETCore.App.Runtime.Mono.wasi-wasm/8.0.28/runtimes/wasi-wasm/native/
        [Debug_mopmctri_pcl]   Performing WASI SDK build: "/root/helix/work/correlation/build/wasi-sdk/bin/clang" "@/root/helix/work/workitem/e/wbt artifacts/Debug_mopmctri_pcl/obj/Debug/net8.0/wasi-wasm/wasm/for-publish/clang-compile.rsp"
        [Debug_mopmctri_pcl]   /root/helix/work/correlation/build/wasi-sdk/bin/wasm-ld: error while loading shared libraries: libxml2.so.2: cannot open shared object file: No such file or directory
        [Debug_mopmctri_pcl] clang : error : unable to execute command: No such file or directory [/root/helix/work/workitem/e/wbt artifacts/Debug_mopmctri_pcl/Debug_mopmctri_pcl.csproj]
        [Debug_mopmctri_pcl] clang : error : linker command failed due to signal (use -v to see invocation) [/root/helix/work/workitem/e/wbt artifacts/Debug_mopmctri_pcl/Debug_mopmctri_pcl.csproj]
        [Debug_mopmctri_pcl] /root/helix/work/workitem/e/dotnet-latest/packs/Microsoft.NET.Runtime.WebAssembly.Wasi.Sdk/8.0.28/Sdk/WasiApp.Native.targets(478,5): error MSB3073: The command ""/root/helix/work/correlation/build/wasi-sdk/bin/clang" "@/root/helix/work/workitem/e/wbt artifacts/Debug_mopmctri_pcl/obj/Debug/net8.0/wasi-wasm/wasm/for-publish/clang-compile.rsp"" exited with code 255. [/root/helix/work/workitem/e/wbt artifacts/Debug_mopmctri_pcl/Debug_mopmctri_pcl.csproj]

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1439242
Error message validated: [libxml2.so.2: cannot open shared object file: No such file or directory]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 5/29/2026 3:05:23 PM UTC

Report

Build	Repository	Test	Pull Request
1439242	dotnet/runtime	Workloads-Wasi.Build.Tests.WorkItemExecution	#126495

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
1	1	1

[dotnet-policy-service]

Tagging subscribers to this area: @akoeplinger, @matouskozak, @simonrozsival
See info in area-owners.md if you want to be subscribed.

[svick]

According to copilot, this was caused by #126528, which updated images to Ubuntu 26.04:

Ubuntu 26.04 ships the new upstream libxml2 2.13+ which renamed the SONAME from libxml2.so.2 to libxml2.so.16 (and the package from libxml2 → libxml2-16). The wasi-sdk's prebuilt wasm-ld is dynamically linked against the old libxml2.so.2, which simply no longer exists on 26.04

cc: @richlander

[svick]

As far as I can tell, this test was disabled on .Net 10+ by #117936. So I guess it makes sense to disable it on .Net 8 and 9 as well.

cc: @maraf

[dotnet-policy-service]

Tagging subscribers to 'arch-wasm': @lewing, @pavelsavara
See info in area-owners.md if you want to be subscribed.

[pavelsavara]

Yes, WASI target is not a product, we can disable it.