System.Xml.Tests failing

[rcj1]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1092691
Build error leg or test failing: System.Xml.CharCheckingReaderTests.CharCheckingReaderTest.RunTests
Pull request: #117549

Error Message

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

{
  "ErrorMessage": "ERROR: Compare All Valid Base64",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1092691
Error message validated: [ERROR: Compare All Valid Base64]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 7/14/2025 5:08:19 PM UTC

Report

Summary

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

[dotnet-policy-service]

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

[jeffhandley]

This seems strangely spontaneous. We should review this before locking down .NET 10 to make sure something didn't regress here.

[jeffhandley]

System.Security.Cryptography.Rsa.Tests.RSAXml Test Suite Fails with Strings Differ/Containers Differ (#117665) is eerily similar with base64 encoding as a suspect root cause.

[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