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[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests - #131883

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radekdoulik:radekdoulik-gate-browser-priority-one
Aug 5, 2026
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[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests#131883
radekdoulik merged 1 commit into
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radekdoulik:radekdoulik-gate-browser-priority-one

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@radekdoulikradekdoulik commented Aug 5, 2026

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Summary

PR #131110 enabled CoreCLR browser-WASM out-of-process runtime tests. The newly enabled priority-1 coverage exposed eight unique failures.

Four were composite WebCIL/ReadyToRun failures tracked by #131767 and are fixed on main by #131354. This change removes their temporary ActiveIssue annotations and Crossgen2 bypasses, restoring the intended R2R coverage. The unrelated field-layout suppression for #131421 remains.

The other four tests are narrowly gated:

  • GC/API/GC/GetTotalAllocatedBytesServerGC is excluded on CoreCLR browser, which does not provide Server GC.
  • GC/API/GC/GetTotalMemoryConcurrent uses PlatformDetection.IsMultithreadingSupported through ConditionalFact.
  • baseservices/threading/regressions/2164/foreground-shutdown retains its explicit Main and returns success before creating a thread when multithreading is unsupported.
  • JIT/jit64/regress/ddb/113574 is excluded only on CoreCLR browser because its multi-billion-iteration optimizing-JIT workload exceeds the browser interpreter's CI timeout.

The runtime capability checks skip single-threaded browser and WASI while preserving desktop and threaded-browser coverage. The Server GC and interpreter-workload exclusions are tracked in #131321.

Testing

Built the Checked browser runtime from main, including #131354, then built and ran the complete priority-1 browser-WASM Node suite:

ScopeTotalPassedFailedSkipped
Full suite14,74513,8230922
Out-of-process subset6725600112

The four former WebCIL/R2R failures now pass:

  • Regressions/coreclr/GitHub_49826/test49826
  • Regressions/coreclr/GitHub_49982/test49982
  • readytorun/tests/genericsload/callgenericctor
  • readytorun/tests/genericsload/usegenericfield

Additional focused validation for the runtime multithreading gates:

  • 8 MSBuild evaluations across desktop, threaded browser, single-threaded browser, and single-threaded WASI; neither project is permanently marked unsupported.
  • 2 targeted Checked browser builds, both with 0 warnings and 0 errors.
  • 2 single-threaded browser wrapper runs, both passing with expected/actual exit code 100.
  • Native foreground-shutdown execution exited with 100 after 2.28 seconds, confirming that its foreground thread still keeps the process alive after Main returns.

Note

This pull request was created with assistance from GitHub Copilot.

@radekdoulik
Restore browser R2R coverage for priority 1 tests
880adc3
Remove the temporary composite WebCIL skips now that the runtime can load the generated images. Gate the remaining unsupported scenarios narrowly and use runtime multithreading capability checks for thread-dependent tests.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 19e61792-38f9-4f80-8d38-3e3e12d1275e
CopilotAI review requested due to automatic review settings August 5, 2026 15:27
@github-actionsgithub-actionsBot added the area-Infrastructure-coreclr Only use for closed issues label Aug 5, 2026
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Pull request overview

This PR restores CoreCLR browser-WASM ReadyToRun (R2R) test coverage by removing temporary browser/CoreCLR ActiveIssue suppressions and Crossgen2 bypasses that were put in place around the composite WebCIL failure, and by narrowly gating a small set of priority-1 tests that are inherently unsupported or impractical under the single-threaded browser/interpreter model.

Changes:

  • Re-enable Crossgen2/R2R execution for several browser-WASM test projects by making them unconditional “explicit crossgen” tests and removing the browser-specific Crossgen2 opt-out.
  • Remove browser/CoreCLR ActiveIssue annotations tied to the composite WebCIL layout issue from the affected ReadyToRun tests, while preserving the separate field-layout suppression.
  • Gate a small number of priority-1 tests using narrow runtime capability checks (ConditionalFact for xUnit tests, early-exit for Main-based tests) and CLRTestTargetUnsupported for browser-only unsupported scenarios.

Reviewed changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated no comments.

Show a summary per file
FileDescription
src/tests/readytorun/GenericCycleDetection/Depth1Test.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/GenericCycleDetection/Depth1Test.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/readytorun/GenericCycleDetection/Breadth1Test.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/GenericCycleDetection/Breadth1Test.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/readytorun/fieldlayout/fieldlayouttests.csKeep only the remaining field-layout suppression; remove the composite WebCIL suppression.
src/tests/readytorun/fieldlayout/fieldlayout.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/DynamicMethodGCStress/DynamicMethodGCStress.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/DynamicMethodGCStress/DynamicMethodGCStress.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/JIT/jit64/regress/ddb/113574/113574.csprojExclude this test for CoreCLR browser where the workload is impractical under the interpreter.
src/tests/GC/API/GC/GetTotalMemoryConcurrent.csprojAdd TestLibrary reference needed for PlatformDetection-based gating.
src/tests/GC/API/GC/GetTotalMemoryConcurrent.csGate the xUnit test on PlatformDetection.IsMultithreadingSupported via ConditionalFact.
src/tests/GC/API/GC/GetTotalAllocatedBytesServerGC.csprojExclude the Server GC test on CoreCLR browser where Server GC isn’t supported.
src/tests/baseservices/TieredCompilation/BasicTest.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitOn_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitOff_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitForLoopsOn_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitForLoopsOff_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_DefaultMode_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/threading/regressions/2164/foreground-shutdown.csprojAdd TestLibrary reference needed for PlatformDetection-based gating.
src/tests/baseservices/threading/regressions/2164/foreground-shutdown.csEarly-exit with success when multithreading isn’t supported (avoid invalid browser scenario).

@radekdoulikradekdoulik added the arch-wasm WebAssembly architecture label Aug 5, 2026
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@radekdoulik
radekdoulik merged commit e308570 into dotnet:mainAug 5, 2026
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@pavelsavarapavelsavarapavelsavara approved these changes

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Status: Done

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@radekdoulik@pavelsavara
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[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests by radekdoulik · Pull Request #131883 · dotnet/runtime · GitHub
Skip to content
[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests - #131883
Merged
radekdoulik merged 1 commit into
dotnet:mainfrom 
radekdoulik:radekdoulik-gate-browser-priority-one
Aug 5, 2026
Merged
[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests#131883
radekdoulik merged 1 commit into
dotnet:mainfrom 
radekdoulik:radekdoulik-gate-browser-priority-one
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@radekdoulik
@radekdoulikradekdoulik
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Aug 5, 2026

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Summary
PR #131110 enabled CoreCLR browser-WASM out-of-process runtime tests. The newly enabled priority-1 coverage exposed eight unique failures.
Four were composite WebCIL/ReadyToRun failures tracked by #131767 and are fixed on main by #131354. This change removes their temporary ActiveIssue annotations and Crossgen2 bypasses, restoring the intended R2R coverage. The unrelated field-layout suppression for #131421 remains.
The other four tests are narrowly gated:
  • GC/API/GC/GetTotalAllocatedBytesServerGC is excluded on CoreCLR browser, which does not provide Server GC.
  • GC/API/GC/GetTotalMemoryConcurrent uses PlatformDetection.IsMultithreadingSupported through ConditionalFact.
  • baseservices/threading/regressions/2164/foreground-shutdown retains its explicit Main and returns success before creating a thread when multithreading is unsupported.
  • JIT/jit64/regress/ddb/113574 is excluded only on CoreCLR browser because its multi-billion-iteration optimizing-JIT workload exceeds the browser interpreter's CI timeout.
The runtime capability checks skip single-threaded browser and WASI while preserving desktop and threaded-browser coverage. The Server GC and interpreter-workload exclusions are tracked in #131321.
Testing
Built the Checked browser runtime from main, including #131354, then built and ran the complete priority-1 browser-WASM Node suite:
ScopeTotalPassedFailedSkipped
Full suite14,74513,8230922
Out-of-process subset6725600112
The four former WebCIL/R2R failures now pass:
  • Regressions/coreclr/GitHub_49826/test49826
  • Regressions/coreclr/GitHub_49982/test49982
  • readytorun/tests/genericsload/callgenericctor
  • readytorun/tests/genericsload/usegenericfield
Additional focused validation for the runtime multithreading gates:
  • 8 MSBuild evaluations across desktop, threaded browser, single-threaded browser, and single-threaded WASI; neither project is permanently marked unsupported.
  • 2 targeted Checked browser builds, both with 0 warnings and 0 errors.
  • 2 single-threaded browser wrapper runs, both passing with expected/actual exit code 100.
  • Native foreground-shutdown execution exited with 100 after 2.28 seconds, confirming that its foreground thread still keeps the process alive after Main returns.
Note
This pull request was created with assistance from GitHub Copilot.
@radekdoulik
Restore browser R2R coverage for priority 1 tests
880adc3
Remove the temporary composite WebCIL skips now that the runtime can load the generated images. Gate the remaining unsupported scenarios narrowly and use runtime multithreading capability checks for thread-dependent tests.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 19e61792-38f9-4f80-8d38-3e3e12d1275e
CopilotAI
review requested due to automatic review settings
August 5, 2026 15:27
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Pull request overview
This PR restores CoreCLR browser-WASM ReadyToRun (R2R) test coverage by removing temporary browser/CoreCLR ActiveIssue suppressions and Crossgen2 bypasses that were put in place around the composite WebCIL failure, and by narrowly gating a small set of priority-1 tests that are inherently unsupported or impractical under the single-threaded browser/interpreter model.
Changes:
  • Re-enable Crossgen2/R2R execution for several browser-WASM test projects by making them unconditional “explicit crossgen” tests and removing the browser-specific Crossgen2 opt-out.
  • Remove browser/CoreCLR ActiveIssue annotations tied to the composite WebCIL layout issue from the affected ReadyToRun tests, while preserving the separate field-layout suppression.
  • Gate a small number of priority-1 tests using narrow runtime capability checks (ConditionalFact for xUnit tests, early-exit for Main-based tests) and CLRTestTargetUnsupported for browser-only unsupported scenarios.
Reviewed changes
Copilot reviewed 20 out of 20 changed files in this pull request and generated no comments.
Show a summary per file
FileDescription
src/tests/readytorun/GenericCycleDetection/Depth1Test.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/GenericCycleDetection/Depth1Test.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/readytorun/GenericCycleDetection/Breadth1Test.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/GenericCycleDetection/Breadth1Test.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/readytorun/fieldlayout/fieldlayouttests.csKeep only the remaining field-layout suppression; remove the composite WebCIL suppression.
src/tests/readytorun/fieldlayout/fieldlayout.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/DynamicMethodGCStress/DynamicMethodGCStress.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/DynamicMethodGCStress/DynamicMethodGCStress.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/JIT/jit64/regress/ddb/113574/113574.csprojExclude this test for CoreCLR browser where the workload is impractical under the interpreter.
src/tests/GC/API/GC/GetTotalMemoryConcurrent.csprojAdd TestLibrary reference needed for PlatformDetection-based gating.
src/tests/GC/API/GC/GetTotalMemoryConcurrent.csGate the xUnit test on PlatformDetection.IsMultithreadingSupported via ConditionalFact.
src/tests/GC/API/GC/GetTotalAllocatedBytesServerGC.csprojExclude the Server GC test on CoreCLR browser where Server GC isn’t supported.
src/tests/baseservices/TieredCompilation/BasicTest.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitOn_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitOff_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitForLoopsOn_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitForLoopsOff_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_DefaultMode_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/threading/regressions/2164/foreground-shutdown.csprojAdd TestLibrary reference needed for PlatformDetection-based gating.
src/tests/baseservices/threading/regressions/2164/foreground-shutdown.csEarly-exit with success when multithreading isn’t supported (avoid invalid browser scenario).
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3 participants

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[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests by radekdoulik · Pull Request #131883 · dotnet/runtime · GitHub
Skip to content
[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests - #131883
Merged
radekdoulik merged 1 commit into
dotnet:mainfrom 
radekdoulik:radekdoulik-gate-browser-priority-one
Aug 5, 2026
Merged
[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests#131883
radekdoulik merged 1 commit into
dotnet:mainfrom 
radekdoulik:radekdoulik-gate-browser-priority-one
Conversation
@radekdoulik
@radekdoulikradekdoulik
commented
Aug 5, 2026

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Summary
PR #131110 enabled CoreCLR browser-WASM out-of-process runtime tests. The newly enabled priority-1 coverage exposed eight unique failures.
Four were composite WebCIL/ReadyToRun failures tracked by #131767 and are fixed on main by #131354. This change removes their temporary ActiveIssue annotations and Crossgen2 bypasses, restoring the intended R2R coverage. The unrelated field-layout suppression for #131421 remains.
The other four tests are narrowly gated:
  • GC/API/GC/GetTotalAllocatedBytesServerGC is excluded on CoreCLR browser, which does not provide Server GC.
  • GC/API/GC/GetTotalMemoryConcurrent uses PlatformDetection.IsMultithreadingSupported through ConditionalFact.
  • baseservices/threading/regressions/2164/foreground-shutdown retains its explicit Main and returns success before creating a thread when multithreading is unsupported.
  • JIT/jit64/regress/ddb/113574 is excluded only on CoreCLR browser because its multi-billion-iteration optimizing-JIT workload exceeds the browser interpreter's CI timeout.
The runtime capability checks skip single-threaded browser and WASI while preserving desktop and threaded-browser coverage. The Server GC and interpreter-workload exclusions are tracked in #131321.
Testing
Built the Checked browser runtime from main, including #131354, then built and ran the complete priority-1 browser-WASM Node suite:
ScopeTotalPassedFailedSkipped
Full suite14,74513,8230922
Out-of-process subset6725600112
The four former WebCIL/R2R failures now pass:
  • Regressions/coreclr/GitHub_49826/test49826
  • Regressions/coreclr/GitHub_49982/test49982
  • readytorun/tests/genericsload/callgenericctor
  • readytorun/tests/genericsload/usegenericfield
Additional focused validation for the runtime multithreading gates:
  • 8 MSBuild evaluations across desktop, threaded browser, single-threaded browser, and single-threaded WASI; neither project is permanently marked unsupported.
  • 2 targeted Checked browser builds, both with 0 warnings and 0 errors.
  • 2 single-threaded browser wrapper runs, both passing with expected/actual exit code 100.
  • Native foreground-shutdown execution exited with 100 after 2.28 seconds, confirming that its foreground thread still keeps the process alive after Main returns.
Note
This pull request was created with assistance from GitHub Copilot.
@radekdoulik
Restore browser R2R coverage for priority 1 tests
880adc3
Remove the temporary composite WebCIL skips now that the runtime can load the generated images. Gate the remaining unsupported scenarios narrowly and use runtime multithreading capability checks for thread-dependent tests.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 19e61792-38f9-4f80-8d38-3e3e12d1275e
CopilotAI
review requested due to automatic review settings
August 5, 2026 15:27
@github-actionsgithub-actionsBot
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Successfully started running 3 pipeline(s).

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Pull request overview
This PR restores CoreCLR browser-WASM ReadyToRun (R2R) test coverage by removing temporary browser/CoreCLR ActiveIssue suppressions and Crossgen2 bypasses that were put in place around the composite WebCIL failure, and by narrowly gating a small set of priority-1 tests that are inherently unsupported or impractical under the single-threaded browser/interpreter model.
Changes:
  • Re-enable Crossgen2/R2R execution for several browser-WASM test projects by making them unconditional “explicit crossgen” tests and removing the browser-specific Crossgen2 opt-out.
  • Remove browser/CoreCLR ActiveIssue annotations tied to the composite WebCIL layout issue from the affected ReadyToRun tests, while preserving the separate field-layout suppression.
  • Gate a small number of priority-1 tests using narrow runtime capability checks (ConditionalFact for xUnit tests, early-exit for Main-based tests) and CLRTestTargetUnsupported for browser-only unsupported scenarios.
Reviewed changes
Copilot reviewed 20 out of 20 changed files in this pull request and generated no comments.
Show a summary per file
FileDescription
src/tests/readytorun/GenericCycleDetection/Depth1Test.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/GenericCycleDetection/Depth1Test.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/readytorun/GenericCycleDetection/Breadth1Test.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/GenericCycleDetection/Breadth1Test.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/readytorun/fieldlayout/fieldlayouttests.csKeep only the remaining field-layout suppression; remove the composite WebCIL suppression.
src/tests/readytorun/fieldlayout/fieldlayout.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/DynamicMethodGCStress/DynamicMethodGCStress.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/DynamicMethodGCStress/DynamicMethodGCStress.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/JIT/jit64/regress/ddb/113574/113574.csprojExclude this test for CoreCLR browser where the workload is impractical under the interpreter.
src/tests/GC/API/GC/GetTotalMemoryConcurrent.csprojAdd TestLibrary reference needed for PlatformDetection-based gating.
src/tests/GC/API/GC/GetTotalMemoryConcurrent.csGate the xUnit test on PlatformDetection.IsMultithreadingSupported via ConditionalFact.
src/tests/GC/API/GC/GetTotalAllocatedBytesServerGC.csprojExclude the Server GC test on CoreCLR browser where Server GC isn’t supported.
src/tests/baseservices/TieredCompilation/BasicTest.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitOn_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitOff_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitForLoopsOn_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitForLoopsOff_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_DefaultMode_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/threading/regressions/2164/foreground-shutdown.csprojAdd TestLibrary reference needed for PlatformDetection-based gating.
src/tests/baseservices/threading/regressions/2164/foreground-shutdown.csEarly-exit with success when multithreading isn’t supported (avoid invalid browser scenario).
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, 'i');
if (__m === '*' || __re.test(location.href)) {
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try {
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var __re = new RegExp('^' + ".*" + '
[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests by radekdoulik · Pull Request #131883 · dotnet/runtime · GitHub
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[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests - #131883
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radekdoulik:radekdoulik-gate-browser-priority-one
Aug 5, 2026
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[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests#131883
radekdoulik merged 1 commit into
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radekdoulik:radekdoulik-gate-browser-priority-one
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Summary
PR #131110 enabled CoreCLR browser-WASM out-of-process runtime tests. The newly enabled priority-1 coverage exposed eight unique failures.
Four were composite WebCIL/ReadyToRun failures tracked by #131767 and are fixed on main by #131354. This change removes their temporary ActiveIssue annotations and Crossgen2 bypasses, restoring the intended R2R coverage. The unrelated field-layout suppression for #131421 remains.
The other four tests are narrowly gated:
  • GC/API/GC/GetTotalAllocatedBytesServerGC is excluded on CoreCLR browser, which does not provide Server GC.
  • GC/API/GC/GetTotalMemoryConcurrent uses PlatformDetection.IsMultithreadingSupported through ConditionalFact.
  • baseservices/threading/regressions/2164/foreground-shutdown retains its explicit Main and returns success before creating a thread when multithreading is unsupported.
  • JIT/jit64/regress/ddb/113574 is excluded only on CoreCLR browser because its multi-billion-iteration optimizing-JIT workload exceeds the browser interpreter's CI timeout.
The runtime capability checks skip single-threaded browser and WASI while preserving desktop and threaded-browser coverage. The Server GC and interpreter-workload exclusions are tracked in #131321.
Testing
Built the Checked browser runtime from main, including #131354, then built and ran the complete priority-1 browser-WASM Node suite:
ScopeTotalPassedFailedSkipped
Full suite14,74513,8230922
Out-of-process subset6725600112
The four former WebCIL/R2R failures now pass:
  • Regressions/coreclr/GitHub_49826/test49826
  • Regressions/coreclr/GitHub_49982/test49982
  • readytorun/tests/genericsload/callgenericctor
  • readytorun/tests/genericsload/usegenericfield
Additional focused validation for the runtime multithreading gates:
  • 8 MSBuild evaluations across desktop, threaded browser, single-threaded browser, and single-threaded WASI; neither project is permanently marked unsupported.
  • 2 targeted Checked browser builds, both with 0 warnings and 0 errors.
  • 2 single-threaded browser wrapper runs, both passing with expected/actual exit code 100.
  • Native foreground-shutdown execution exited with 100 after 2.28 seconds, confirming that its foreground thread still keeps the process alive after Main returns.
Note
This pull request was created with assistance from GitHub Copilot.
@radekdoulik
Restore browser R2R coverage for priority 1 tests
880adc3
Remove the temporary composite WebCIL skips now that the runtime can load the generated images. Gate the remaining unsupported scenarios narrowly and use runtime multithreading capability checks for thread-dependent tests.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 19e61792-38f9-4f80-8d38-3e3e12d1275e
CopilotAI
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Pull request overview
This PR restores CoreCLR browser-WASM ReadyToRun (R2R) test coverage by removing temporary browser/CoreCLR ActiveIssue suppressions and Crossgen2 bypasses that were put in place around the composite WebCIL failure, and by narrowly gating a small set of priority-1 tests that are inherently unsupported or impractical under the single-threaded browser/interpreter model.
Changes:
  • Re-enable Crossgen2/R2R execution for several browser-WASM test projects by making them unconditional “explicit crossgen” tests and removing the browser-specific Crossgen2 opt-out.
  • Remove browser/CoreCLR ActiveIssue annotations tied to the composite WebCIL layout issue from the affected ReadyToRun tests, while preserving the separate field-layout suppression.
  • Gate a small number of priority-1 tests using narrow runtime capability checks (ConditionalFact for xUnit tests, early-exit for Main-based tests) and CLRTestTargetUnsupported for browser-only unsupported scenarios.
Reviewed changes
Copilot reviewed 20 out of 20 changed files in this pull request and generated no comments.
Show a summary per file
FileDescription
src/tests/readytorun/GenericCycleDetection/Depth1Test.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/GenericCycleDetection/Depth1Test.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/readytorun/GenericCycleDetection/Breadth1Test.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/GenericCycleDetection/Breadth1Test.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/readytorun/fieldlayout/fieldlayouttests.csKeep only the remaining field-layout suppression; remove the composite WebCIL suppression.
src/tests/readytorun/fieldlayout/fieldlayout.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/DynamicMethodGCStress/DynamicMethodGCStress.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/DynamicMethodGCStress/DynamicMethodGCStress.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/JIT/jit64/regress/ddb/113574/113574.csprojExclude this test for CoreCLR browser where the workload is impractical under the interpreter.
src/tests/GC/API/GC/GetTotalMemoryConcurrent.csprojAdd TestLibrary reference needed for PlatformDetection-based gating.
src/tests/GC/API/GC/GetTotalMemoryConcurrent.csGate the xUnit test on PlatformDetection.IsMultithreadingSupported via ConditionalFact.
src/tests/GC/API/GC/GetTotalAllocatedBytesServerGC.csprojExclude the Server GC test on CoreCLR browser where Server GC isn’t supported.
src/tests/baseservices/TieredCompilation/BasicTest.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitOn_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitOff_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitForLoopsOn_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitForLoopsOff_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_DefaultMode_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/threading/regressions/2164/foreground-shutdown.csprojAdd TestLibrary reference needed for PlatformDetection-based gating.
src/tests/baseservices/threading/regressions/2164/foreground-shutdown.csEarly-exit with success when multithreading isn’t supported (avoid invalid browser scenario).
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merged commit e308570
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@radekdoulik@pavelsavara

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
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mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests by radekdoulik · Pull Request #131883 · dotnet/runtime · GitHub
Skip to content
[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests - #131883
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radekdoulik merged 1 commit into
dotnet:mainfrom 
radekdoulik:radekdoulik-gate-browser-priority-one
Aug 5, 2026
Merged
[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests#131883
radekdoulik merged 1 commit into
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radekdoulik:radekdoulik-gate-browser-priority-one
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Summary
PR #131110 enabled CoreCLR browser-WASM out-of-process runtime tests. The newly enabled priority-1 coverage exposed eight unique failures.
Four were composite WebCIL/ReadyToRun failures tracked by #131767 and are fixed on main by #131354. This change removes their temporary ActiveIssue annotations and Crossgen2 bypasses, restoring the intended R2R coverage. The unrelated field-layout suppression for #131421 remains.
The other four tests are narrowly gated:
  • GC/API/GC/GetTotalAllocatedBytesServerGC is excluded on CoreCLR browser, which does not provide Server GC.
  • GC/API/GC/GetTotalMemoryConcurrent uses PlatformDetection.IsMultithreadingSupported through ConditionalFact.
  • baseservices/threading/regressions/2164/foreground-shutdown retains its explicit Main and returns success before creating a thread when multithreading is unsupported.
  • JIT/jit64/regress/ddb/113574 is excluded only on CoreCLR browser because its multi-billion-iteration optimizing-JIT workload exceeds the browser interpreter's CI timeout.
The runtime capability checks skip single-threaded browser and WASI while preserving desktop and threaded-browser coverage. The Server GC and interpreter-workload exclusions are tracked in #131321.
Testing
Built the Checked browser runtime from main, including #131354, then built and ran the complete priority-1 browser-WASM Node suite:
ScopeTotalPassedFailedSkipped
Full suite14,74513,8230922
Out-of-process subset6725600112
The four former WebCIL/R2R failures now pass:
  • Regressions/coreclr/GitHub_49826/test49826
  • Regressions/coreclr/GitHub_49982/test49982
  • readytorun/tests/genericsload/callgenericctor
  • readytorun/tests/genericsload/usegenericfield
Additional focused validation for the runtime multithreading gates:
  • 8 MSBuild evaluations across desktop, threaded browser, single-threaded browser, and single-threaded WASI; neither project is permanently marked unsupported.
  • 2 targeted Checked browser builds, both with 0 warnings and 0 errors.
  • 2 single-threaded browser wrapper runs, both passing with expected/actual exit code 100.
  • Native foreground-shutdown execution exited with 100 after 2.28 seconds, confirming that its foreground thread still keeps the process alive after Main returns.
Note
This pull request was created with assistance from GitHub Copilot.
@radekdoulik
Restore browser R2R coverage for priority 1 tests
880adc3
Remove the temporary composite WebCIL skips now that the runtime can load the generated images. Gate the remaining unsupported scenarios narrowly and use runtime multithreading capability checks for thread-dependent tests.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 19e61792-38f9-4f80-8d38-3e3e12d1275e
CopilotAI
review requested due to automatic review settings
August 5, 2026 15:27
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Pull request overview
This PR restores CoreCLR browser-WASM ReadyToRun (R2R) test coverage by removing temporary browser/CoreCLR ActiveIssue suppressions and Crossgen2 bypasses that were put in place around the composite WebCIL failure, and by narrowly gating a small set of priority-1 tests that are inherently unsupported or impractical under the single-threaded browser/interpreter model.
Changes:
  • Re-enable Crossgen2/R2R execution for several browser-WASM test projects by making them unconditional “explicit crossgen” tests and removing the browser-specific Crossgen2 opt-out.
  • Remove browser/CoreCLR ActiveIssue annotations tied to the composite WebCIL layout issue from the affected ReadyToRun tests, while preserving the separate field-layout suppression.
  • Gate a small number of priority-1 tests using narrow runtime capability checks (ConditionalFact for xUnit tests, early-exit for Main-based tests) and CLRTestTargetUnsupported for browser-only unsupported scenarios.
Reviewed changes
Copilot reviewed 20 out of 20 changed files in this pull request and generated no comments.
Show a summary per file
FileDescription
src/tests/readytorun/GenericCycleDetection/Depth1Test.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/GenericCycleDetection/Depth1Test.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/readytorun/GenericCycleDetection/Breadth1Test.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/GenericCycleDetection/Breadth1Test.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/readytorun/fieldlayout/fieldlayouttests.csKeep only the remaining field-layout suppression; remove the composite WebCIL suppression.
src/tests/readytorun/fieldlayout/fieldlayout.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/DynamicMethodGCStress/DynamicMethodGCStress.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/DynamicMethodGCStress/DynamicMethodGCStress.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/JIT/jit64/regress/ddb/113574/113574.csprojExclude this test for CoreCLR browser where the workload is impractical under the interpreter.
src/tests/GC/API/GC/GetTotalMemoryConcurrent.csprojAdd TestLibrary reference needed for PlatformDetection-based gating.
src/tests/GC/API/GC/GetTotalMemoryConcurrent.csGate the xUnit test on PlatformDetection.IsMultithreadingSupported via ConditionalFact.
src/tests/GC/API/GC/GetTotalAllocatedBytesServerGC.csprojExclude the Server GC test on CoreCLR browser where Server GC isn’t supported.
src/tests/baseservices/TieredCompilation/BasicTest.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitOn_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitOff_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitForLoopsOn_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitForLoopsOff_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_DefaultMode_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/threading/regressions/2164/foreground-shutdown.csprojAdd TestLibrary reference needed for PlatformDetection-based gating.
src/tests/baseservices/threading/regressions/2164/foreground-shutdown.csEarly-exit with success when multithreading isn’t supported (avoid invalid browser scenario).
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests by radekdoulik · Pull Request #131883 · dotnet/runtime · GitHub
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[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests - #131883
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radekdoulik:radekdoulik-gate-browser-priority-one
Aug 5, 2026
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[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests#131883
radekdoulik merged 1 commit into
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Summary
PR #131110 enabled CoreCLR browser-WASM out-of-process runtime tests. The newly enabled priority-1 coverage exposed eight unique failures.
Four were composite WebCIL/ReadyToRun failures tracked by #131767 and are fixed on main by #131354. This change removes their temporary ActiveIssue annotations and Crossgen2 bypasses, restoring the intended R2R coverage. The unrelated field-layout suppression for #131421 remains.
The other four tests are narrowly gated:
  • GC/API/GC/GetTotalAllocatedBytesServerGC is excluded on CoreCLR browser, which does not provide Server GC.
  • GC/API/GC/GetTotalMemoryConcurrent uses PlatformDetection.IsMultithreadingSupported through ConditionalFact.
  • baseservices/threading/regressions/2164/foreground-shutdown retains its explicit Main and returns success before creating a thread when multithreading is unsupported.
  • JIT/jit64/regress/ddb/113574 is excluded only on CoreCLR browser because its multi-billion-iteration optimizing-JIT workload exceeds the browser interpreter's CI timeout.
The runtime capability checks skip single-threaded browser and WASI while preserving desktop and threaded-browser coverage. The Server GC and interpreter-workload exclusions are tracked in #131321.
Testing
Built the Checked browser runtime from main, including #131354, then built and ran the complete priority-1 browser-WASM Node suite:
ScopeTotalPassedFailedSkipped
Full suite14,74513,8230922
Out-of-process subset6725600112
The four former WebCIL/R2R failures now pass:
  • Regressions/coreclr/GitHub_49826/test49826
  • Regressions/coreclr/GitHub_49982/test49982
  • readytorun/tests/genericsload/callgenericctor
  • readytorun/tests/genericsload/usegenericfield
Additional focused validation for the runtime multithreading gates:
  • 8 MSBuild evaluations across desktop, threaded browser, single-threaded browser, and single-threaded WASI; neither project is permanently marked unsupported.
  • 2 targeted Checked browser builds, both with 0 warnings and 0 errors.
  • 2 single-threaded browser wrapper runs, both passing with expected/actual exit code 100.
  • Native foreground-shutdown execution exited with 100 after 2.28 seconds, confirming that its foreground thread still keeps the process alive after Main returns.
Note
This pull request was created with assistance from GitHub Copilot.
@radekdoulik
Restore browser R2R coverage for priority 1 tests
880adc3
Remove the temporary composite WebCIL skips now that the runtime can load the generated images. Gate the remaining unsupported scenarios narrowly and use runtime multithreading capability checks for thread-dependent tests.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 19e61792-38f9-4f80-8d38-3e3e12d1275e
CopilotAI
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Pull request overview
This PR restores CoreCLR browser-WASM ReadyToRun (R2R) test coverage by removing temporary browser/CoreCLR ActiveIssue suppressions and Crossgen2 bypasses that were put in place around the composite WebCIL failure, and by narrowly gating a small set of priority-1 tests that are inherently unsupported or impractical under the single-threaded browser/interpreter model.
Changes:
  • Re-enable Crossgen2/R2R execution for several browser-WASM test projects by making them unconditional “explicit crossgen” tests and removing the browser-specific Crossgen2 opt-out.
  • Remove browser/CoreCLR ActiveIssue annotations tied to the composite WebCIL layout issue from the affected ReadyToRun tests, while preserving the separate field-layout suppression.
  • Gate a small number of priority-1 tests using narrow runtime capability checks (ConditionalFact for xUnit tests, early-exit for Main-based tests) and CLRTestTargetUnsupported for browser-only unsupported scenarios.
Reviewed changes
Copilot reviewed 20 out of 20 changed files in this pull request and generated no comments.
Show a summary per file
FileDescription
src/tests/readytorun/GenericCycleDetection/Depth1Test.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/GenericCycleDetection/Depth1Test.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/readytorun/GenericCycleDetection/Breadth1Test.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/GenericCycleDetection/Breadth1Test.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/readytorun/fieldlayout/fieldlayouttests.csKeep only the remaining field-layout suppression; remove the composite WebCIL suppression.
src/tests/readytorun/fieldlayout/fieldlayout.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/DynamicMethodGCStress/DynamicMethodGCStress.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/DynamicMethodGCStress/DynamicMethodGCStress.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/JIT/jit64/regress/ddb/113574/113574.csprojExclude this test for CoreCLR browser where the workload is impractical under the interpreter.
src/tests/GC/API/GC/GetTotalMemoryConcurrent.csprojAdd TestLibrary reference needed for PlatformDetection-based gating.
src/tests/GC/API/GC/GetTotalMemoryConcurrent.csGate the xUnit test on PlatformDetection.IsMultithreadingSupported via ConditionalFact.
src/tests/GC/API/GC/GetTotalAllocatedBytesServerGC.csprojExclude the Server GC test on CoreCLR browser where Server GC isn’t supported.
src/tests/baseservices/TieredCompilation/BasicTest.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitOn_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitOff_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitForLoopsOn_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitForLoopsOff_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_DefaultMode_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/threading/regressions/2164/foreground-shutdown.csprojAdd TestLibrary reference needed for PlatformDetection-based gating.
src/tests/baseservices/threading/regressions/2164/foreground-shutdown.csEarly-exit with success when multithreading isn’t supported (avoid invalid browser scenario).
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@radekdoulik@pavelsavara

, 'i');
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function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
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}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests by radekdoulik · Pull Request #131883 · dotnet/runtime · GitHub
Skip to content
[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests - #131883
Merged
radekdoulik merged 1 commit into
dotnet:mainfrom 
radekdoulik:radekdoulik-gate-browser-priority-one
Aug 5, 2026
Merged
[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests#131883
radekdoulik merged 1 commit into
dotnet:mainfrom 
radekdoulik:radekdoulik-gate-browser-priority-one
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@radekdoulik
@radekdoulikradekdoulik
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Aug 5, 2026

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Summary
PR #131110 enabled CoreCLR browser-WASM out-of-process runtime tests. The newly enabled priority-1 coverage exposed eight unique failures.
Four were composite WebCIL/ReadyToRun failures tracked by #131767 and are fixed on main by #131354. This change removes their temporary ActiveIssue annotations and Crossgen2 bypasses, restoring the intended R2R coverage. The unrelated field-layout suppression for #131421 remains.
The other four tests are narrowly gated:
  • GC/API/GC/GetTotalAllocatedBytesServerGC is excluded on CoreCLR browser, which does not provide Server GC.
  • GC/API/GC/GetTotalMemoryConcurrent uses PlatformDetection.IsMultithreadingSupported through ConditionalFact.
  • baseservices/threading/regressions/2164/foreground-shutdown retains its explicit Main and returns success before creating a thread when multithreading is unsupported.
  • JIT/jit64/regress/ddb/113574 is excluded only on CoreCLR browser because its multi-billion-iteration optimizing-JIT workload exceeds the browser interpreter's CI timeout.
The runtime capability checks skip single-threaded browser and WASI while preserving desktop and threaded-browser coverage. The Server GC and interpreter-workload exclusions are tracked in #131321.
Testing
Built the Checked browser runtime from main, including #131354, then built and ran the complete priority-1 browser-WASM Node suite:
ScopeTotalPassedFailedSkipped
Full suite14,74513,8230922
Out-of-process subset6725600112
The four former WebCIL/R2R failures now pass:
  • Regressions/coreclr/GitHub_49826/test49826
  • Regressions/coreclr/GitHub_49982/test49982
  • readytorun/tests/genericsload/callgenericctor
  • readytorun/tests/genericsload/usegenericfield
Additional focused validation for the runtime multithreading gates:
  • 8 MSBuild evaluations across desktop, threaded browser, single-threaded browser, and single-threaded WASI; neither project is permanently marked unsupported.
  • 2 targeted Checked browser builds, both with 0 warnings and 0 errors.
  • 2 single-threaded browser wrapper runs, both passing with expected/actual exit code 100.
  • Native foreground-shutdown execution exited with 100 after 2.28 seconds, confirming that its foreground thread still keeps the process alive after Main returns.
Note
This pull request was created with assistance from GitHub Copilot.
@radekdoulik
Restore browser R2R coverage for priority 1 tests
880adc3
Remove the temporary composite WebCIL skips now that the runtime can load the generated images. Gate the remaining unsupported scenarios narrowly and use runtime multithreading capability checks for thread-dependent tests.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 19e61792-38f9-4f80-8d38-3e3e12d1275e
CopilotAI
review requested due to automatic review settings
August 5, 2026 15:27
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Pull request overview
This PR restores CoreCLR browser-WASM ReadyToRun (R2R) test coverage by removing temporary browser/CoreCLR ActiveIssue suppressions and Crossgen2 bypasses that were put in place around the composite WebCIL failure, and by narrowly gating a small set of priority-1 tests that are inherently unsupported or impractical under the single-threaded browser/interpreter model.
Changes:
  • Re-enable Crossgen2/R2R execution for several browser-WASM test projects by making them unconditional “explicit crossgen” tests and removing the browser-specific Crossgen2 opt-out.
  • Remove browser/CoreCLR ActiveIssue annotations tied to the composite WebCIL layout issue from the affected ReadyToRun tests, while preserving the separate field-layout suppression.
  • Gate a small number of priority-1 tests using narrow runtime capability checks (ConditionalFact for xUnit tests, early-exit for Main-based tests) and CLRTestTargetUnsupported for browser-only unsupported scenarios.
Reviewed changes
Copilot reviewed 20 out of 20 changed files in this pull request and generated no comments.
Show a summary per file
FileDescription
src/tests/readytorun/GenericCycleDetection/Depth1Test.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/GenericCycleDetection/Depth1Test.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/readytorun/GenericCycleDetection/Breadth1Test.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/GenericCycleDetection/Breadth1Test.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/readytorun/fieldlayout/fieldlayouttests.csKeep only the remaining field-layout suppression; remove the composite WebCIL suppression.
src/tests/readytorun/fieldlayout/fieldlayout.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/DynamicMethodGCStress/DynamicMethodGCStress.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/DynamicMethodGCStress/DynamicMethodGCStress.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/JIT/jit64/regress/ddb/113574/113574.csprojExclude this test for CoreCLR browser where the workload is impractical under the interpreter.
src/tests/GC/API/GC/GetTotalMemoryConcurrent.csprojAdd TestLibrary reference needed for PlatformDetection-based gating.
src/tests/GC/API/GC/GetTotalMemoryConcurrent.csGate the xUnit test on PlatformDetection.IsMultithreadingSupported via ConditionalFact.
src/tests/GC/API/GC/GetTotalAllocatedBytesServerGC.csprojExclude the Server GC test on CoreCLR browser where Server GC isn’t supported.
src/tests/baseservices/TieredCompilation/BasicTest.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitOn_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitOff_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitForLoopsOn_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitForLoopsOff_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_DefaultMode_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/threading/regressions/2164/foreground-shutdown.csprojAdd TestLibrary reference needed for PlatformDetection-based gating.
src/tests/baseservices/threading/regressions/2164/foreground-shutdown.csEarly-exit with success when multithreading isn’t supported (avoid invalid browser scenario).
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filter: invert(1) hue-rotate(180deg) !important;
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::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
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})();
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[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests by radekdoulik · Pull Request #131883 · dotnet/runtime · GitHub
Skip to content
[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests - #131883
Merged
radekdoulik merged 1 commit into
dotnet:mainfrom 
radekdoulik:radekdoulik-gate-browser-priority-one
Aug 5, 2026
Merged
[browser][CoreCLR] Restore R2R coverage and gate unsupported priority-1 tests#131883
radekdoulik merged 1 commit into
dotnet:mainfrom 
radekdoulik:radekdoulik-gate-browser-priority-one
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Summary
PR #131110 enabled CoreCLR browser-WASM out-of-process runtime tests. The newly enabled priority-1 coverage exposed eight unique failures.
Four were composite WebCIL/ReadyToRun failures tracked by #131767 and are fixed on main by #131354. This change removes their temporary ActiveIssue annotations and Crossgen2 bypasses, restoring the intended R2R coverage. The unrelated field-layout suppression for #131421 remains.
The other four tests are narrowly gated:
  • GC/API/GC/GetTotalAllocatedBytesServerGC is excluded on CoreCLR browser, which does not provide Server GC.
  • GC/API/GC/GetTotalMemoryConcurrent uses PlatformDetection.IsMultithreadingSupported through ConditionalFact.
  • baseservices/threading/regressions/2164/foreground-shutdown retains its explicit Main and returns success before creating a thread when multithreading is unsupported.
  • JIT/jit64/regress/ddb/113574 is excluded only on CoreCLR browser because its multi-billion-iteration optimizing-JIT workload exceeds the browser interpreter's CI timeout.
The runtime capability checks skip single-threaded browser and WASI while preserving desktop and threaded-browser coverage. The Server GC and interpreter-workload exclusions are tracked in #131321.
Testing
Built the Checked browser runtime from main, including #131354, then built and ran the complete priority-1 browser-WASM Node suite:
ScopeTotalPassedFailedSkipped
Full suite14,74513,8230922
Out-of-process subset6725600112
The four former WebCIL/R2R failures now pass:
  • Regressions/coreclr/GitHub_49826/test49826
  • Regressions/coreclr/GitHub_49982/test49982
  • readytorun/tests/genericsload/callgenericctor
  • readytorun/tests/genericsload/usegenericfield
Additional focused validation for the runtime multithreading gates:
  • 8 MSBuild evaluations across desktop, threaded browser, single-threaded browser, and single-threaded WASI; neither project is permanently marked unsupported.
  • 2 targeted Checked browser builds, both with 0 warnings and 0 errors.
  • 2 single-threaded browser wrapper runs, both passing with expected/actual exit code 100.
  • Native foreground-shutdown execution exited with 100 after 2.28 seconds, confirming that its foreground thread still keeps the process alive after Main returns.
Note
This pull request was created with assistance from GitHub Copilot.
@radekdoulik
Restore browser R2R coverage for priority 1 tests
880adc3
Remove the temporary composite WebCIL skips now that the runtime can load the generated images. Gate the remaining unsupported scenarios narrowly and use runtime multithreading capability checks for thread-dependent tests.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 19e61792-38f9-4f80-8d38-3e3e12d1275e
CopilotAI
review requested due to automatic review settings
August 5, 2026 15:27
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Pull request overview
This PR restores CoreCLR browser-WASM ReadyToRun (R2R) test coverage by removing temporary browser/CoreCLR ActiveIssue suppressions and Crossgen2 bypasses that were put in place around the composite WebCIL failure, and by narrowly gating a small set of priority-1 tests that are inherently unsupported or impractical under the single-threaded browser/interpreter model.
Changes:
  • Re-enable Crossgen2/R2R execution for several browser-WASM test projects by making them unconditional “explicit crossgen” tests and removing the browser-specific Crossgen2 opt-out.
  • Remove browser/CoreCLR ActiveIssue annotations tied to the composite WebCIL layout issue from the affected ReadyToRun tests, while preserving the separate field-layout suppression.
  • Gate a small number of priority-1 tests using narrow runtime capability checks (ConditionalFact for xUnit tests, early-exit for Main-based tests) and CLRTestTargetUnsupported for browser-only unsupported scenarios.
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src/tests/readytorun/GenericCycleDetection/Depth1Test.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/GenericCycleDetection/Depth1Test.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/readytorun/GenericCycleDetection/Breadth1Test.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/GenericCycleDetection/Breadth1Test.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/readytorun/fieldlayout/fieldlayouttests.csKeep only the remaining field-layout suppression; remove the composite WebCIL suppression.
src/tests/readytorun/fieldlayout/fieldlayout.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/DynamicMethodGCStress/DynamicMethodGCStress.csprojMake the project unconditionally use Crossgen2 (restore crossgen coverage on browser).
src/tests/readytorun/DynamicMethodGCStress/DynamicMethodGCStress.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/JIT/jit64/regress/ddb/113574/113574.csprojExclude this test for CoreCLR browser where the workload is impractical under the interpreter.
src/tests/GC/API/GC/GetTotalMemoryConcurrent.csprojAdd TestLibrary reference needed for PlatformDetection-based gating.
src/tests/GC/API/GC/GetTotalMemoryConcurrent.csGate the xUnit test on PlatformDetection.IsMultithreadingSupported via ConditionalFact.
src/tests/GC/API/GC/GetTotalAllocatedBytesServerGC.csprojExclude the Server GC test on CoreCLR browser where Server GC isn’t supported.
src/tests/baseservices/TieredCompilation/BasicTest.csRemove browser/CoreCLR suppression tied to the composite WebCIL issue.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitOn_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitOff_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitForLoopsOn_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_QuickJitForLoopsOff_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/TieredCompilation/BasicTest_DefaultMode_R2r.csprojMake the project unconditionally use Crossgen2; remove browser-specific bypass/defines.
src/tests/baseservices/threading/regressions/2164/foreground-shutdown.csprojAdd TestLibrary reference needed for PlatformDetection-based gating.
src/tests/baseservices/threading/regressions/2164/foreground-shutdown.csEarly-exit with success when multithreading isn’t supported (avoid invalid browser scenario).
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