Test failure: ProcessTests.SignalHandler_CanDisposeInHandler

## Build Information
Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1346111
Build error leg or test failing: System.Diagnostics.Tests.ProcessTests.SignalHandler_CanDisposeInHandler
Pull request: https://github.com/dotnet/runtime.git/pull/125882

## Error Message

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

```json
{
"ErrorMessage": ["SignalHandler_CanDisposeInHandler","Assert.True()"],
"BuildRetry": false,
"ExcludeConsoleLog": false
}
```

```
System.Diagnostics.Tests.ProcessTests.SignalHandler_CanDisposeInHandler(signal: SIGQUIT)
Exception Message
Assert.True() Failure
Expected: True
Actual: False
Stack Trace
at System.Diagnostics.Tests.ProcessTests.SignalHandler_CanDisposeInHandler(PosixSignal signal) in /_/src/libraries/System.Diagnostics.Process/tests/ProcessTests.cs:line 260
at System.Object.InvokeStub_ProcessTests.SignalHandler_CanDisposeInHandler(Object, Span`1)
at System.Reflection.MethodBaseInvoker.InvokeWithOneArg(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) in /_/src/libraries/System.Private.CoreLib/src/System/Reflection/MethodBaseInvoker.cs:line 95
```

### Known issue validation
**Build: :mag_right:** https://dev.azure.com/dnceng-public/public/_build/results?buildId=1346111
**Error message validated:** `[SignalHandler_CanDisposeInHandler Assert.True()`]
**Result validation:** :white_check_mark: Known issue matched with the provided build.
**Validation performed at:** 3/23/2026 10:37:15 AM UTC

### Report

|Build|Repository|Test|Pull Request|
|---|---|---|---|
|[1574201](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1574201)|dotnet/runtime|[System.Diagnostics.Tests.ProcessTests.SignalHandler_CanDisposeInHandler](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1574201&view=ms.vss-test-web.build-test-results-tab&runId=43380090&resultId=205978)||
|[1564993](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1564993)|dotnet/runtime|[System.Diagnostics.Tests.ProcessTests.SignalHandler_CanDisposeInHandler](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1564993&view=ms.vss-test-web.build-test-results-tab&runId=43093762&resultId=201237)|dotnet/runtime#132703|
|[1558092](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1558092)|dotnet/runtime|[System.Diagnostics.Tests.ProcessTests.SignalHandler_CanDisposeInHandler](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1558092&view=ms.vss-test-web.build-test-results-tab&runId=42881834&resultId=189183)|dotnet/runtime#132481|
#### Summary
|24-Hour Hit Count|7-Day Hit Count|1-Month Count|
|---|---|---|
|0|0|3|