System.Formats.Nrbf.Tests timeout occasionally in the CI

[janvorli]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1353436
Build error leg or test failing: System.Formats.Nrbf.Tests.WorkItemExecution
Pull request: #126043

Error Message

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

{
  "ErrorMessage": "'System.Formats.Nrbf.Tests' END OF WORK ITEM LOG: Command timed out, and was killed",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1353436
Error message validated: ['System.Formats.Nrbf.Tests' END OF WORK ITEM LOG: Command timed out, and was killed]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 3/31/2026 2:38:07 PM UTC

Report

Build	Repository	Test	Pull Request
1577668	dotnet/runtime	System.Formats.Nrbf.Tests.WorkItemExecution
1572029	dotnet/runtime	System.Formats.Nrbf.Tests.WorkItemExecution
1558022	dotnet/runtime	System.Formats.Nrbf.Tests.WorkItemExecution
1551997	dotnet/runtime	System.Formats.Nrbf.Tests.WorkItemExecution

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	0	4

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[janvorli]

Another failure here: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1353069&view=ms.vss-test-web.build-test-results-tab&runId=37957614&resultId=223081&paneView=dotnet-dnceng.dnceng-build-release-tasks.helix-test-information-tab

[MihuBot]

I'm a bot. Here is a possible related and/or duplicate issue (I may be wrong):

• System.Formats.Nrbf.Tests timeouts #110285

[JulieLeeMSFT]

Failed in (1):

• runtime-coreclr crossgen2 20260802.1

Console Log: Console Log
Source: runtime-coreclr crossgen2 / net11.0-windows-Release-x64-TestReadyToRun_Release-(Windows.Nano.1809.Amd64.Open)windows.10.amd64.serverrs5.open@mcr.microsoft.com/dotnet-buildtools/prereqs:nanoserver-1809-helix-amd64@sha256:ad046c7c714e67836938c230b7b67dc1c59c137f25ce9d236da925c351c79743 / System.Formats.Nrbf.Tests

Failed tests:

- net11.0-windows-Release-x64-TestReadyToRun_Release-(Windows.Nano.1809.Amd64.Open)windows.10.amd64.serverrs5.open@mcr.microsoft.com/dotnet-buildtools/prereqs:nanoserver-1809-helix-amd64@sha256:ad046c7c714e67836938c230b7b67dc1c59c137f25ce9d236da925c351c79743
  - System.Formats.Nrbf.Tests