Utf8JsonWriterTests.WriteValueWithExtremelyLongValue_ThrowsArgumentException test fails with OutOfMemoryException

[jkotas]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1180196
Build error leg or test failing: System.Text.Json.Tests.Utf8JsonWriterTests.WritePropertyWithExtremelyLongName_ThrowsArgumentException
Pull request: #120858

Error Message

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

{
  "ErrorMessage": ["System.Text.Json.Tests.Utf8JsonWriterTests.WriteValueWithExtremelyLongValue_ThrowsArgumentException","OutOfMemoryException"],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1180196
Error message validated: [System.Text.Json.Tests.Utf8JsonWriterTests.WriteValueWithExtremelyLongValue_ThrowsArgumentException OutOfMemoryException]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 10/20/2025 9:30:10 PM UTC

Report

Build	Definition	Test	Pull Request
1180337	dotnet/runtime	System.Text.Json.Tests.Utf8JsonWriterTests.WritePropertyWithExtremelyLongName_ThrowsArgumentException	#120917
1180312	dotnet/runtime	System.Text.Json.Tests.Utf8JsonWriterTests.WritePropertyWithExtremelyLongName_ThrowsArgumentException	#120041
1180275	dotnet/runtime	System.Text.Json.Tests.Utf8JsonWriterTests.WriteValueWithExtremelyLongValue_ThrowsArgumentException	#120272
1180196	dotnet/runtime	System.Text.Json.Tests.Utf8JsonWriterTests.WritePropertyWithExtremelyLongName_ThrowsArgumentException	#120858

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
4	4	4

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/area-system-text-json, @gregsdennis
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[jkotas]

Regression introduced by #120731

cc @eiriktsarpalis @stephentoub

[MihuBot]

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

• Test failure: System.Text.Json.Tests.Utf8JsonWriterTests.WriteValueWithExtremelyLongValue_ThrowsArgumentException #120890