XmlSerializerTests.Xml_DerivedIXmlSerializable is failing on linux-musl legs

[am11]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=786082
Build error leg or test failing: XmlSerializerTests.Xml_DerivedIXmlSerializable
Pull request: #80154

Error Message

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

{
  "ErrorPattern": "BaseIXmlSerializable xmlns:xs.*DerivedIXmlSerializable",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Cause: #104173

cc @StephenMolloy

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=786082
Error message validated: [BaseIXmlSerializable xmlns:xs.*DerivedIXmlSerializable]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 8/23/2024 9:39:20 AM UTC

Report

Build	Definition	Test	Pull Request
786582	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106760
786958	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106831
786737	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#103795
786915	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106735
786901	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106901
786875	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#80154
786867	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106900
786786	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable
786775	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106844
786050	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#102498
786719	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106564
786683	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106765
786625	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106889
786614	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106888
786484	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106660
786597	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#105771
786594	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106413
786546	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106839
786477	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106779
786528	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#103795
786508	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#102547
786470	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106882
785908	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106421
786408	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106403
786355	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106875
786344	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106874
786361	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106779
786340	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106873
786226	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#80154
786159	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable
786131	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106859
785977	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106839
786174	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#106637
786082	dotnet/runtime	XmlSerializerTests.Xml_DerivedIXmlSerializable	#80154

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
33	34	34

[akoeplinger]

The reason is because of the ICU change that added a different whitespace for date time: #83571

The test needs to be updated to not hardcode space as the separator, e.g. by formatting the DateTime.

[am11]

Fixed by #106891.