[ci-scan] Known Build Error: GC/API/Refresh/Refresh.cmd fails in gc-standalone

[github-actions]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1414855
Build error leg or test failing: coreclr linux x64 Checked gcstandalone-GC/API/Refresh/Refresh/Refresh.cmd

Error Message

{
  "ErrorMessage": "Failed test: GC/API/Refresh/Refresh/Refresh.cmd",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Tracking: #127667

Failure details:

Xunit.Sdk.EqualException: Assert.Equal() Failure: Values differ
Expected: 100
Actual:   101
   at Xunit.Assert.Equal[T](T expected, T actual, IEqualityComparer`1 comparer)
   at __GeneratedMainWrapper.Main()

Affected legs (all gc-standalone legs, every build in 12+ build window):

• coreclr linux arm64 Checked gcstandalone
• coreclr linux arm64 Checked gcstandaloneserver
• coreclr linux x64 Checked gcstandalone
• coreclr linux x64 Checked gcstandaloneserver
• coreclr windows arm64 Checked gcstandalone
• coreclr windows arm64 Checked gcstandaloneserver
• coreclr windows x64 Checked gcstandalone
• coreclr windows x64 Checked gcstandaloneserver

First build in window: gc-standalone 20260414.1 (2026-04-14). 12 consecutive failures in scanned window.

Note

🔒 Integrity filter blocked 6 items

The following items were blocked because they don't meet the GitHub integrity level.

• #114222 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #110173 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #84911 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #125825 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #92423 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #85535 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
  github:
    min-integrity: approved  # merged | approved | unapproved | none

Generated by CI Outer-Loop Failure Scanner · ● 52.8M · ◷

Report

Build	Definition	Test	Pull Request
1414855	dotnet/runtime	GC/API/GC/Collect_Aggressive_LargePages/Collect_Aggressive_LargePages.cmd

Summary

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

Report

Build	Repository	Test	Pull Request
1494444	dotnet/runtime	GC/API/GC/Collect_Aggressive_LargePages/Collect_Aggressive_LargePages.cmd
1491722	dotnet/runtime	GC/API/Refresh/Refresh/Refresh.cmd
1487780	dotnet/runtime	GC/API/Refresh/Refresh/Refresh.cmd
1484792	dotnet/runtime	GC/API/Refresh/Refresh/Refresh.cmd
1481226	dotnet/runtime	GC/API/GC/Collect_Aggressive_LargePages/Collect_Aggressive_LargePages.cmd
1477321	dotnet/runtime	GC/API/GC/Collect_Aggressive_LargePages/Collect_Aggressive_LargePages.cmd
1474385	dotnet/runtime	GC/API/Refresh/Refresh/Refresh.cmd
1470804	dotnet/runtime	GC/API/GC/Collect_Aggressive_LargePages/Collect_Aggressive_LargePages.cmd
1466400	dotnet/runtime	GC/API/GC/Collect_Aggressive_LargePages/Collect_Aggressive_LargePages.cmd

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	3	9

[dotnet-policy-service]

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

[jeffschwMSFT]

removing blocking-clean-ci as it has not failed in 30 days

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

[github-actions]

Workflow artifact: ci-fix
Artifact kind: handoff
Linked KBE: #128076

Note

AI/Copilot-generated triage note.

This Known Build Error has no producible automated code change (reason: GC product code — the GC/API/Refresh and Collect_Aggressive_LargePages tests exercise GC internals that exceed automated fix bounds), so I could not open even a best-effort PR. Looping in owners so it can be fixed forward rather than muted.

Root cause (best analysis)

GC/API/Refresh/Refresh.cmd consistently fails across all gc-standalone legs (linux-x64, linux-arm64, windows-x64, windows-arm64, both gcstandalone and gcstandaloneserver) with:

Assert.Equal() Failure: Values differ
Expected: 100
Actual:   101

The test expects the return value 100 (pass), but the GC standalone implementation returns 101 (fail). The Collect_Aggressive_LargePages test on the same legs is also failing. Both tests are GC API validation tests that exercise the standalone GC implementation.

The failure has been persistent since at least 2026-04-14 (12+ consecutive gc-standalone builds). The KBE body notes tracking under #127667.

Despite a MEMBER removing blocking-clean-ci on 2026-06-09, the failure continues — recent Build Analysis shows 3 hits in 7 days, 5 in 1 month.

Evidence

• Failing build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1414855
• First build it occurred: gc-standalone 20260414.1 (2026-04-14, within scanned window; true origin may predate)
• Recent failure: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1474385 (2026-06-20)
• Suspected regressing change: none identified with sufficient confidence

Suggested reviewers / area contacts

• Area lead (area-GC-coreclr): @anicka-net
• Area owners: @dotnet/gc

---

Filed by ci-failure-fix, which attempts validated fixes for [ci-scan] Known Build Errors and otherwise loops in owners. Comment here or on the workflow file to suggest changes; ci-failure-scan-feedback reads in-scope feedback daily and opens (or updates) a PR with prompt edits.

Note

🔒 Integrity filter blocked 6 items

The following items were blocked because they don't meet the GitHub integrity level.

• #128501 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #104998 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #104750 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #97491 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #76276 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• [ci-scan] Test failure: CustomAttributeDecoderTests.TestCustomAttributeDecoderGenericUsingReflection on maccatalyst #128450 issue_read: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
  github:
    min-integrity: approved  # merged | approved | unapproved | none

Generated by CI Outer-Loop Failure Fixer · ● 30M · ◷