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CI failure on 10.0 on Windows: Unable to load DLL 'nativelibrary' in R2R tests #133888

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CI failure on 10.0 on Windows: Unable to load DLL 'nativelibrary' in R2R tests#133888
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Known Build ErrorUse this to report build issues in the .NET Helix tabarea-ReadyToRunblocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'
Milestone
12.0.0

Description

@svick
svick
opened on Sep 14, 2026

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1595328
Build error leg or test failing: readytorun/tests/mainv1/mainv1.cmd
Pull request: #133851

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": [
    "Running test: readytorun/tests",
    "System.DllNotFoundException: Unable to load DLL 'nativelibrary' or one of its dependencies: The specified module could not be found."],
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}
10:59:47.689 Running test: readytorun/tests/mainv1/mainv1.cmd
Unhandled exception. System.DllNotFoundException: Unable to load DLL 'nativelibrary' or one of its dependencies: The specified module could not be found. (0x8007007E)
   at MyClass.NativeMethod()
   at Program.RunAllTests()
   at Program.Main()

Return code:      1
Raw output file:      C:\h\w\A4E008E5\w\A6E50938\uploads\tests\mainv1\output.txt
Raw output:
BEGIN EXECUTION
        1 file(s) copied.
        1 file(s) copied.
Emitting R2R PE file: test.dll
Emitting map file: test.map
Emitting R2R PE file: fieldgetter.dll
Emitting map file: fieldgetter.map
Emitting R2R PE file: mainv1.dll
Emitting map file: mainv1.map
 "C:\h\w\A4E008E5\p\corerun.exe" -p "System.Reflection.Metadata.MetadataUpdater.IsSupported=false" -p "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization=true"  mainv1.dll 
TestVirtualMethodCalls
TestMovedVirtualMethod
TestThrowHelpers
TestConstrainedMethodCalls
TestConstrainedMethodCalls_Unsupported
TestInterop
Expected: 100
Actual: -532462766
END EXECUTION - FAILED
FAILED
Test failed. Trying to see if dump file was created in C:\cores since 9/14/2026 10:59:47 AM
Processing C:\cores\corerun.exe.8572.dmp
Unable to find cdb.exe at C:\Program Files (x86)\Windows Kits\10\Debuggers\arm64\cdb.exe
Test Harness Exitcode is : 1
To run the test:
Set up CORE_ROOT and run.
> C:\h\w\A4E008E5\w\A6E50938\e\readytorun\readytorun\../tests/mainv1/mainv1.cmd
Xunit.Sdk.TrueException: Unhandled exception. System.DllNotFoundException: Unable to load DLL 'nativelibrary' or one of its dependencies: The specified module could not be found. (0x8007007E)
   at MyClass.NativeMethod()
   at Program.RunAllTests()
   at Program.Main()

Return code:      1
Raw output file:      C:\h\w\A4E008E5\w\A6E50938\uploads\tests\mainv1\output.txt
Raw output:
BEGIN EXECUTION
        1 file(s) copied.
        1 file(s) copied.
Emitting R2R PE file: test.dll
Emitting map file: test.map
Emitting R2R PE file: fieldgetter.dll
Emitting map file: fieldgetter.map
Emitting R2R PE file: mainv1.dll
Emitting map file: mainv1.map
 "C:\h\w\A4E008E5\p\corerun.exe" -p "System.Reflection.Metadata.MetadataUpdater.IsSupported=false" -p "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization=true"  mainv1.dll 
TestVirtualMethodCalls
TestMovedVirtualMethod
TestThrowHelpers
TestConstrainedMethodCalls
TestConstrainedMethodCalls_Unsupported
TestInterop
Expected: 100
Actual: -532462766
END EXECUTION - FAILED
FAILED
Test failed. Trying to see if dump file was created in C:\cores since 9/14/2026 10:59:47 AM
Processing C:\cores\corerun.exe.8572.dmp
Unable to find cdb.exe at C:\Program Files (x86)\Windows Kits\10\Debuggers\arm64\cdb.exe
Test Harness Exitcode is : 1
To run the test:
Set up CORE_ROOT and run.
> C:\h\w\A4E008E5\w\A6E50938\e\readytorun\readytorun\../tests/mainv1/mainv1.cmd
   at Xunit.Assert.True(Nullable`1 condition, String userMessage) in /_/src/arcade/src/Microsoft.DotNet.XUnitAssert/src/BooleanAsserts.cs:line 141
   at Program.<<Main>$>g__TestExecutor19|0_20(StreamWriter tempLogSw, StreamWriter statsCsvSw, <>c__DisplayClass0_0&)
10:59:56.160 Failed test: readytorun/tests/mainv1/mainv1.cmd
10:59:56.165 Running test: readytorun/tests/mainv2/mainv2.cmd
Unhandled exception. System.DllNotFoundException: Unable to load DLL 'nativelibrary' or one of its dependencies: The specified module could not be found. (0x8007007E)
   at MyClass.NativeMethod()
   at Program.RunAllTests()
   at Program.Main()

Return code:      1
Raw output file:      C:\h\w\A4E008E5\w\A6E50938\uploads\tests\mainv2\output.txt
Raw output:
BEGIN EXECUTION
        1 file(s) copied.
        1 file(s) copied.
Emitting R2R PE file: test.dll
Emitting map file: test.map
Emitting R2R PE file: fieldgetter.dll
Emitting map file: fieldgetter.map
Emitting R2R PE file: mainv2.dll
Emitting map file: mainv2.map
 "C:\h\w\A4E008E5\p\corerun.exe" -p "System.Reflection.Metadata.MetadataUpdater.IsSupported=false" -p "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization=true"  mainv2.dll 
TestVirtualMethodCalls
TestMovedVirtualMethod
TestThrowHelpers
TestConstrainedMethodCalls
TestConstrainedMethodCalls_Unsupported
TestInterop
Expected: 100
Actual: -532462766
END EXECUTION - FAILED
FAILED
Test failed. Trying to see if dump file was created in C:\cores since 9/14/2026 10:59:56 AM
Processing C:\cores\corerun.exe.5832.dmp
Unable to find cdb.exe at C:\Program Files (x86)\Windows Kits\10\Debuggers\arm64\cdb.exe
Finished looking for *.dmp. No new files created.
Test Harness Exitcode is : 1
To run the test:
Set up CORE_ROOT and run.
> C:\h\w\A4E008E5\w\A6E50938\e\readytorun\readytorun\../tests/mainv2/mainv2.cmd
Xunit.Sdk.TrueException: Unhandled exception. System.DllNotFoundException: Unable to load DLL 'nativelibrary' or one of its dependencies: The specified module could not be found. (0x8007007E)
   at MyClass.NativeMethod()
   at Program.RunAllTests()
   at Program.Main()

Return code:      1
Raw output file:      C:\h\w\A4E008E5\w\A6E50938\uploads\tests\mainv2\output.txt
Raw output:
BEGIN EXECUTION
        1 file(s) copied.
        1 file(s) copied.
Emitting R2R PE file: test.dll
Emitting map file: test.map
Emitting R2R PE file: fieldgetter.dll
Emitting map file: fieldgetter.map
Emitting R2R PE file: mainv2.dll
Emitting map file: mainv2.map
 "C:\h\w\A4E008E5\p\corerun.exe" -p "System.Reflection.Metadata.MetadataUpdater.IsSupported=false" -p "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization=true"  mainv2.dll 
TestVirtualMethodCalls
TestMovedVirtualMethod
TestThrowHelpers
TestConstrainedMethodCalls
TestConstrainedMethodCalls_Unsupported
TestInterop
Expected: 100
Actual: -532462766
END EXECUTION - FAILED
FAILED
Test failed. Trying to see if dump file was created in C:\cores since 9/14/2026 10:59:56 AM
Processing C:\cores\corerun.exe.5832.dmp
Unable to find cdb.exe at C:\Program Files (x86)\Windows Kits\10\Debuggers\arm64\cdb.exe
Finished looking for *.dmp. No new files created.
Test Harness Exitcode is : 1
To run the test:
Set up CORE_ROOT and run.
> C:\h\w\A4E008E5\w\A6E50938\e\readytorun\readytorun\../tests/mainv2/mainv2.cmd
   at Xunit.Assert.True(Nullable`1 condition, String userMessage) in /_/src/arcade/src/Microsoft.DotNet.XUnitAssert/src/BooleanAsserts.cs:line 141
   at Program.<<Main>$>g__TestExecutor20|0_21(StreamWriter tempLogSw, StreamWriter statsCsvSw, <>c__DisplayClass0_0&)
11:00:00.597 Failed test: readytorun/tests/mainv2/mainv2.cmd

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595328
Error message validated: [Running test: readytorun/tests System.DllNotFoundException: Unable to load DLL 'nativelibrary' or one of its dependencies: The specified module could not be found.]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 9/14/2026 3:57:57 PM UTC

Report

Build Repository Test Pull Request
1627313 dotnet/runtime readytorun/tests/mainv1/mainv1.cmd #135376
1625102 dotnet/runtime readytorun/tests/mainv1/mainv1.cmd
1624402 dotnet/runtime readytorun/tests/mainv1/mainv1.cmd #133926
1609418 dotnet/runtime readytorun/tests/mainv1/mainv1.cmd
1604944 dotnet/runtime readytorun/tests/mainv1/mainv1.cmd
1595328 dotnet/runtime readytorun/tests/mainv1/mainv1.cmd #133851

Summary

24-Hour Hit Count 7-Day Hit Count 1-Month Count
0 3 6

Activity

  1. svick
    added
    blocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'
    Known Build ErrorUse this to report build issues in the .NET Helix tab
    on Sep 14, 2026
  2. dotnet-policy-service
    added
    untriagedNew issue has not been triaged by the area owner
    on Sep 14, 2026
  3. github-actions
    added
    area-ReadyToRun
    on Sep 14, 2026
  4. github-project-automation
    added this to AppModelon Sep 14, 2026

  5. dotnet-policy-service commented on Sep 14, 2026

    @dotnet-policy-service
    dotnet-policy-servicebot
    on Sep 14, 2026 – with Dotnet Policy Service
    Contributor

    Tagging subscribers to this area: @dotnet/crossgen-contrib
    See info in area-owners.md if you want to be subscribed.

  6. agocke
    added this to the 12.0.0 milestone on Oct 6, 2026
  7. agocke
    removed
    untriagedNew issue has not been triaged by the area owner
    on Oct 6, 2026
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