Test Failure: System.Text.Json.Serialization.Tests.StreamTests_Sync.VeryLargeJsonFileTest

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#130,783 opened on Jul 15, 2026 2 comments 0 reactions 0 assignees View on GitHub

area-System.Text.Json blocking-clean-ci-optional Known Build Error

Dominant language: C#
Stars: 18.3k
Forks: 5.6k
PR merge metrics: PR metrics pending

Description

## Build Information
Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1508411
Build error leg or test failing: System.Text.Json.Serialization.Tests.StreamTests_Sync.VeryLargeJsonFileTest

## Error Message

Fill the error message using [step by step known issues guidance](https://github.com/dotnet/arcade/blob/main/Documentation/Build%20Analysis/KnownIssueJsonStepByStep.md).

```json
{
"ErrorPattern": "\\[FAIL\\]\\s+System\\.Text\\.Json\\.Serialization\\.Tests\\.StreamTests_Sync\\.VeryLargeJsonFileTest\\(payloadSize:\\s*1000,\\s*ignoreNull:\\s*False,\\s*writeIndented:\\s*False\\)",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
```

### Known issue validation
**Build: :mag_right:** https://dev.azure.com/dnceng-public/public/_build/results?buildId=1508411
**Error message validated:** `[System.Text.Json.Serialization.Tests.StreamTests_Sync.VeryLargeJsonFileTest.+[FAIL]`]
**Result validation:** :white_check_mark: Known issue matched with the provided build.
**Validation performed at:** 7/15/2026 2:19:19 PM UTC

### Report

|Build|Repository|Test|Pull Request|
|---|---|---|---|
|[1549539](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1549539)|dotnet/runtime|[WasmTestOnChrome-MONO-ST-System.Text.Json.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1549539&view=ms.vss-test-web.build-test-results-tab&runId=42663296&resultId=100307)||
|[1547726](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1547726)|dotnet/runtime|[WasmTestOnChrome-MONO-ST-System.Text.Json.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1547726&view=ms.vss-test-web.build-test-results-tab&runId=42615532&resultId=100307)||
|[1546377](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1546377)|dotnet/runtime|[normal-System.Text.Json.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1546377&view=ms.vss-test-web.build-test-results-tab&runId=42578366&resultId=100273)||
|[1545668](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1545668)|dotnet/runtime|[WasmTestOnChrome-MONO-ST-System.Text.Json.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1545668&view=ms.vss-test-web.build-test-results-tab&runId=42558858&resultId=100307)||
|[1545268](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1545268)|dotnet/runtime|[WasmTestOnChrome-MONO-ST-System.Text.Json.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1545268&view=ms.vss-test-web.build-test-results-tab&runId=42546866&resultId=100307)||
|[1542078](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1542078)|dotnet/runtime|[WasmTestOnChrome-MONO-ST-System.Text.Json.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1542078&view=ms.vss-test-web.build-test-results-tab&runId=42459850&resultId=100307)||
|[1538577](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1538577)|dotnet/runtime|[WasmTestOnChrome-MONO-ST-System.Text.Json.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1538577&view=ms.vss-test-web.build-test-results-tab&runId=42368290&resultId=100307)||
|[1536699](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1536699)|dotnet/runtime|[WasmTestOnChrome-MONO-ST-System.Text.Json.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1536699&view=ms.vss-test-web.build-test-results-tab&runId=42316662&resultId=100307)||
|[1534164](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1534164)|dotnet/runtime|[WasmTestOnChrome-MONO-ST-System.Text.Json.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1534164&view=ms.vss-test-web.build-test-results-tab&runId=42246454&resultId=100307)||
|[1531463](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1531463)|dotnet/runtime|[WasmTestOnChrome-MONO-ST-System.Text.Json.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1531463&view=ms.vss-test-web.build-test-results-tab&runId=42167636&resultId=100307)|dotnet/runtime#131524|
|[1530179](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1530179)|dotnet/runtime|[WasmTestOnChrome-MONO-ST-System.Text.Json.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1530179&view=ms.vss-test-web.build-test-results-tab&runId=42130964&resultId=193662)|dotnet/runtime#131484|
|[1529233](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1529233)|dotnet/runtime|[WasmTestOnChrome-MONO-ST-System.Text.Json.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1529233&view=ms.vss-test-web.build-test-results-tab&runId=42104378&resultId=100307)||
|[1527467](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1527467)|dotnet/runtime|[WasmTestOnChrome-MONO-ST-System.Text.Json.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1527467&view=ms.vss-test-web.build-test-results-tab&runId=42055242&resultId=100307)||
|[1526936](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1526936)|dotnet/runtime|[WasmTestOnChrome-MONO-ST-System.Text.Json.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1526936&view=ms.vss-test-web.build-test-results-tab&runId=42038770&resultId=100307)||
|[1526281](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1526281)|dotnet/runtime|[WasmTestOnChrome-MONO-ST-System.Text.Json.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1526281&view=ms.vss-test-web.build-test-results-tab&runId=42024128&resultId=100307)||
|[1515512](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1515512)|dotnet/runtime|[System.Text.Json.Serialization.Tests.StreamTests_Sync.VeryLargeJsonFileTest](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1515512&view=ms.vss-test-web.build-test-results-tab&runId=41825568&resultId=227366)|dotnet/runtime#130985|
|[1515969](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1515969)|dotnet/runtime|[System.Text.Json.Serialization.Tests.StreamTests_Sync.VeryLargeJsonFileTest](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1515969&view=ms.vss-test-web.build-test-results-tab&runId=41756660&resultId=226982)|dotnet/runtime#130907|
|[1511037](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1511037)|dotnet/runtime|[WasmTestOnFirefox-MONO-ST-System.Text.Json.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1511037&view=ms.vss-test-web.build-test-results-tab&runId=41635358&resultId=203015)|dotnet/runtime#130808|
|[1508411](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1508411)|dotnet/runtime|[System.Text.Json.Serialization.Tests.StreamTests_Sync.VeryLargeJsonFileTest](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1508411&view=ms.vss-test-web.build-test-results-tab&runId=41573380&resultId=227599)||
#### Summary
|24-Hour Hit Count|7-Day Hit Count|1-Month Count|
|---|---|---|
|1|6|19|

### Known issue validation
**Build: :mag_right:**
**Result validation:** :warning: Build internal information not found. This may happen if your build is too old. Please use a build that is no older than two weeks. If the problem persists, contact [.NET Engineering Services Team](https://dev.azure.com/dnceng/internal/_wiki/wikis/DNCEng%20Services%20Wiki/890/How-to-get-a-hold-of-Engineering-Servicing) and share this issue.
**Validation performed at:** 8/13/2026 1:42:01 AM UTC

### Report

### Report
#### Summary
|24-Hour Hit Count|7-Day Hit Count|1-Month Count|
|---|---|---|
|0|0|0|

Contributor guide

Open the contributing guide

Research direction

Start with the System.Text.Json.Serialization.Tests.StreamTests_Sync.VeryLargeJsonFileTest failure in build 1508411 and compare the repeated failures listed in the issue, including the Wasm and normal test runs. Inspect the build and test logs to identify the cause; done means the test passes reliably across the affected configurations.

Written by the indexing model from the issue text.

Assessment

Tech stack: csharp
Domain: testing-qa
Issue type: Bug
Difficulty: 3/5
Estimated time: 1-2 days
Activity status: Quiet
Clarity: Needs clarification
Newbie friendliness: 45/100

Test Failure: System.Text.Json.Serialization.Tests.StreamTests_Sync.VeryLargeJsonFileTest

Description

Contributor guide

Research direction

Assessment

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