System.Collections.Concurrent.Tests.IntRangePartitionerTests.CheckGetPartitions - GetPartitions element mismatch

[pavelsavara]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1276338
Build error leg or test failing: System.Collections.Concurrent.Tests.IntRangePartitionerTests.CheckGetPartitions

Error Message

Log

  Starting:    System.Collections.Concurrent.Tests (parallel test collections = on [2 threads], stop on fail = off)
Mismatching elements. Expected: 2147483643, Actual: 2147481977
    System.Collections.Concurrent.Tests.IntRangePartitionerTests.CheckGetPartitions(from: 2147473647, count: 9999, dop: 4) [FAIL]
      GetPartitions element mismatch
      Stack Trace:
        /_/src/libraries/System.Collections.Concurrent/tests/IntRangePartitionerTests.cs(70,0): at System.Collections.Concurrent.Tests.IntRangePartitionerTests.CheckGetPartitions(Int32 from, Int32 count, Int32 dop)
           at InvokeStub_IntRangePartitionerTests.CheckGetPartitions(Object, Span`1)
        /_/src/libraries/System.Private.CoreLib/src/System/Reflection/MethodBaseInvoker.cs(136,0): at System.Reflection.MethodBaseInvoker.InvokeWithFewArgs(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
  Finished:    System.Collections.Concurrent.Tests

{
  "ErrorMessage": "GetPartitions element mismatch",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1276338
Error message validated: [GetPartitions element mismatch]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 2/2/2026 7:53:49 PM UTC

Report

Build	Definition	Test	Pull Request
1278734	dotnet/runtime	System.Collections.Concurrent.Tests.IntRangePartitionerTests.CheckGetPartitions	#123971
1278394	dotnet/runtime	System.Collections.Concurrent.Tests.LongRangePartitionerTests.CheckGetPartitionsWithRange	#123643
1276338	dotnet/runtime	System.Collections.Concurrent.Tests.IntRangePartitionerTests.CheckGetPartitions	#123629

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
2	3	3

[MihuBot]

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

• Possible overflow in Partitioner.Create(int fromInclusive, int toExclusive)? #30553

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Tagging subscribers to this area: @dotnet/area-system-collections
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[AndyAyersMS]

Also seeing

    System.Collections.Concurrent.Tests.IntRangePartitionerTests.TestPartitionerCreate(fromInclusive: -2147483648, toExclusive: 2147483647) [FAIL]
      Assert.Equal() Failure: Values differ
      Expected: 2147483644
      Actual:   1431655762