Test failure: System.Text.RegularExpressions.Tests.RegexPcre2Tests.IsMatchTests

[v-wenyuxu]

Failed in: runtime-coreclr libraries-jitstress 20240923.1

Failed tests:

net9.0-windows-Release-x86-jitstress2-Windows.10.Amd64.Open
    - System.Text.RegularExpressions.Tests.RegexPcre2Tests.IsMatchTests

Error message:

 System.ArgumentException : 
warning CS8785: Generator 'RegexGenerator' failed to generate source. It will not contribute to the output and compilation errors may occur as a result. Exception was of type 'OutOfMemoryException' with message 'Exception of type 'System.OutOfMemoryException' was thrown.'.
System.OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown.
   at System.Text.StringBuilder.ToString() in /_/src/libraries/System.Private.CoreLib/src/System/Text/StringBuilder.cs:line 322
   at System.Text.RegularExpressions.Generator.RegexGenerator.<>c.<Initialize>b__5_4(SourceProductionContext context, ImmutableArray`1 results) in /_/src/libraries/System.Text.RegularExpressions/gen/RegexGenerator.cs:line 287
   at Microsoft.CodeAnalysis.UserFunctionExtensions.<>c__DisplayClass3_0`2.<WrapUserAction>b__0(TInput1 input1, TInput2 input2, CancellationToken token)
-----

Stack trace:

   at System.Text.RegularExpressions.Tests.RegexGeneratorHelper.SourceGenRegexAsync(ValueTuple`4[] regexes, CancellationToken cancellationToken) in /_/src/libraries/System.Text.RegularExpressions/tests/FunctionalTests/RegexGeneratorHelper.netcoreapp.cs:line 221
   at System.Text.RegularExpressions.Tests.RegexHelpers.GetRegexesAsync(RegexEngine engine, ValueTuple`4[] regexes) in /_/src/libraries/System.Text.RegularExpressions/tests/FunctionalTests/Regex.Tests.Common.cs:line 147
   at System.Text.RegularExpressions.Tests.RegexHelpers.GetRegexes(RegexEngine engine, ValueTuple`4[] regexes) in /_/src/libraries/System.Text.RegularExpressions/tests/FunctionalTests/Regex.Tests.Common.cs:line 135
   at System.Text.RegularExpressions.Tests.RegexPcre2Tests.PcreTestData()+MoveNext() in /_/src/libraries/System.Text.RegularExpressions/tests/FunctionalTests/RegexPcreTests.cs:line 22
   at System.Linq.Enumerable.IEnumerableSelectIterator`2.MoveNext() in /_/src/libraries/System.Linq/src/System/Linq/Select.cs:line 131

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[steveharter]

Some other activity that may or may not be related:

• JitStress + switch\case issues which should be helped by the revert: Revert "JIT: Extend jump tables (#107831)" #108169. UPDATE: that was for v10, and this issue is for v9, so likely not related.
• The recent Test failure: Microsoft.Gen.OptionsValidation.Unit.Test.EmitterTests.InaccessibleValidationAttributesTest #108129 which is OutOfMemoryException + JitStress

[BruceForstall]

The test did not fail in the pipeline with #108169