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System.Xml.Tests.AttributeReadingPerformanceTests_XmlNodeReader.AttributeDuplicatesCheck_ShortUris_DistinctLocalNames_BelowThreshold failure: Scaling ratio 41.4x exceeded 40.0x limit (input grew 10x). Small (2000): 23 ms, Large (20000): 953 ms. #131973
Description
Build Information
Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1541467
Build error leg or test failing: System.Xml.Tests.AttributeReadingPerformanceTests_XmlNodeReader.AttributeDuplicatesCheck_ShortUris_DistinctLocalNames_BelowThreshold
Pull request: #131894
System.Xml.Tests.AttributeReadingPerformanceTests_XmlNodeReader.AttributeDuplicatesCheck_ShortUris_DistinctLocalNames_BelowThreshold [FAIL]
Scaling ratio 41.4x exceeded 40.0x limit (input grew 10x). Small (2000): 23 ms, Large (20000): 953 ms.
Stack Trace:
/_/src/libraries/System.Private.Xml/tests/Misc/AttributeReadingPerformanceTests.cs(90,0): at System.Xml.Tests.AttributeReadingPerformanceTests.AssertLinearScaling(Func`2 generateDoc)
/_/src/libraries/System.Private.Xml/tests/Misc/AttributeReadingPerformanceTests.cs(62,0): at System.Xml.Tests.AttributeReadingPerformanceTests.AttributeDuplicatesCheck_ShortUris_DistinctLocalNames_BelowThreshold()
at System.RuntimeMethodHandle.InvokeMethod(ObjectHandleOnStack target, Void** arguments, ObjectHandleOnStack sig, BOOL isConstructor, ObjectHandleOnStack result)
/_/src/libraries/System.Private.CoreLib/src/System/Reflection/RuntimeMethodInfo.cs(134,0): at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
Error Message
{
"ErrorMessage": ["AttributeDuplicatesCheck_ShortUris_DistinctLocalNames_BelowThreshold [FAIL]", "Scaling ratio" ],
"BuildRetry": false,
"ExcludeConsoleLog": false
}Known issue validation
Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1541467
Error message validated: [AttributeDuplicatesCheck_ShortUris_DistinctLocalNames_BelowThreshold Scaling ratio exceeded 40.0x limit]
Result validation: ❌ Known issue did not match with the provided build.
Validation performed at: 8/6/2026 11:25:51 PM UTC
Known issue validation
Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1541467
Error message validated: [AttributeDuplicatesCheck_ShortUris_DistinctLocalNames_BelowThreshold [FAIL] Scaling ratio]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 8/6/2026 11:55:17 PM UTC
Report
Summary
| 24-Hour Hit Count | 7-Day Hit Count | 1-Month Count |
|---|---|---|
| 2 | 4 | 8 |
Activity
elinor-fung commentedon Aug 6, 2026
Test added in #130968 - cc @krwq
dotnet-policy-service commentedon Aug 6, 2026
Tagging subscribers to this area: @dotnet/area-system-xml
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jeffhandley commentedon Aug 16, 2026
@krwq Please take a look at this to see if this is a product issue or a test issue introduced by Improve perf of attribute duplicate check (#130968).
Reduce noise in AttributeReadingPerformanceTests scaling assertion (#…