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[ci-scan] Build break: Crossgen2 TypeLoadException 'Gen' from assembly 'b27077' generic explicit layout #133302
Description
Build Information
Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1582971
Build error leg or test failing: runtime-coreclr crossgen2 outerloop (definition 134) — R2R_CG2 Regression_4 leg. Crossgen2 aborts compiling test assembly b27077.
Pipeline: runtime-coreclr crossgen2 outerloop (definition 134), branch main. When Crossgen2 lays out the exception-info lookup table for assembly b27077, it throws a TypeLoadException: the type Gen is a generic type declared with explicit layout, which is invalid. Crossgen2 exits -1073740791 and the R2R_CG2 work item fails. This is a compile-time crossgen2 break, distinct from the runtime failures tracked elsewhere. Reproduces across source build 1582971 and follow-up build 1584221.
Error Details
Unhandled exception. Internal.TypeSystem.TypeSystemException+TypeLoadException: Failed to load type 'Gen' from assembly 'b27077' because generic types cannot have explicit layout
at ILCompiler.DependencyAnalysis.ReadyToRun.ExceptionInfoLookupTableNode.LayoutMethodsWithEHInfo() in /_/src/coreclr/tools/aot/ILCompiler.ReadyToRun/Compiler/DependencyAnalysis/ReadyToRun/ExceptionInfoLookupTableNode.cs:line 95
at ILCompiler.DependencyAnalysis.ReadyToRun.ExceptionInfoLookupTableNode.ShouldSkipEmittingObjectNode(NodeFactory) in /_/src/coreclr/tools/aot/ILCompiler.ReadyToRun/Compiler/DependencyAnalysis/ReadyToRun/ExceptionInfoLookupTableNode.cs:line 154
Crossgen2 failed with exitcode - -1073740791
Error Message
{
"ErrorMessage": "Failed to load type 'Gen' from assembly 'b27077' because generic types cannot have explicit layout",
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}Agentic workflow metadata (ci-failure-scan)
Workflow artifact: ci-failure-scan
Artifact kind: kbe-verification
Verified match count: 1 hits in failure.log
First build it occurred: 1582971
Related: #133216 (distinct Crossgen2 TypeLoadException on 'Negative002' / 'format is invalid')
Duplicate search
Searched open/closed Known Build Error issues and merged PRs for the Gen/b27077/explicit layout signature. Open #133216 tracks a distinct Crossgen2 TypeLoadException (Negative002, format is invalid); Build Analysis matches on the verbatim substring, so this explicit layout signature is filed separately. No fix PR has merged after the source build.
Filed by ci-failure-scan (detection only). ci-failure-fix walks open [ci-scan] KBEs and either opens a small fix PR or comments to loop in owners — it never disables the test.
Note
Generated by the CI Outer-Loop Failure Scanner agentic workflow (AI-generated content).
Generated by CI Outer-Loop Failure Scanner · opus48 · 457.6 AIC · ⌖ 13 AIC · ⊞ 20.7K · ◷
Report
| Build | Repository | Test | Pull Request |
|---|---|---|---|
| 1592131 | dotnet/runtime | Regression_4.WorkItemExecution | |
| 1590362 | dotnet/runtime | Regression_4.WorkItemExecution |
Summary
| 24-Hour Hit Count | 7-Day Hit Count | 1-Month Count |
|---|---|---|
| 1 | 2 | 2 |
Activity
dotnet-policy-service commentedon Sep 8, 2026
Tagging subscribers to this area: @dotnet/crossgen-contrib
See info in area-owners.md if you want to be subscribed.
VincentBu commentedon Sep 10, 2026
Failed in: runtime-coreclr outerloop 20260909.9
Failed tests:
Error message:
Catch TypeSystemException in Debug check in crossgen2 (#133458)