[ci-scan] Test failure: System.Diagnostics.Tests.MobileProcessTests.Process_Start_WithStandardHandles_CanRedirectIO #136906

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1659071
Build error leg or test failing: android-x64 Release AllSubsets_CoreCLR-System.Diagnostics.Process.Tests / System.Diagnostics.Tests.MobileProcessTests.Process_Start_WithStandardHandles_CanRedirectIO
Also affected: android-x64 Release NativeAOT.
Pipeline: runtime-extra-platforms, definition 154, main.
First build it occurred: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1646363 (finished 2026-10-23; earliest verified occurrence in the sampled window, not the established introduction).
Follow-up build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1661087 (finished 2026-11-03), same failure on both runtime variants.

Error Details

With restrictHandles: True, the child process returns 159 instead of 0. The sibling unrestricted-handles case passes. No root cause is established by this scan.

The signature was verified in eight distinct source-and-prior builds: 1646363, 1648254, 1648681, 1653767, 1655451, 1657310, 1658360, and 1659071. It also reproduces in follow-up build 1661087. Twelve recent builds were inspected; missing Android submissions in other sampled builds do not establish that the test passed or that this regression began in this window. The true origin may predate 2026-10-23.

Source console: https://helixr1107v0xdcypoyl9e7f.blob.core.windows.net/dotnet-runtime-refs-heads-main-71dc1455d5e74b2cbf/System.Diagnostics.Process.Tests/1/console.7fa95795.log?helixlogtype=result

Log prefixes are omitted below:

[FAIL] System.Diagnostics.Tests.MobileProcessTests.Process_Start_WithStandardHandles_CanRedirectIO(restrictHandles: True)
Assert.Equal() Failure: Values differ
Expected: 0
Actual:   159
   at System.Diagnostics.Tests.MobileProcessTests.Process_Start_WithStandardHandles_CanRedirectIO(Boolean restrictHandles)
   at System.Reflection.InstanceCalliHelper.Call( fn, Object o, Boolean arg1)
   at System.Reflection.IntrinsicInvokeHelper.Instance_Void_Bool(IntPtr fn, Object obj, IntPtr* args, RuntimeType _)
   at System.Reflection.IntrinsicInvokeHelper.Invoke(InvokeState& state, InvokerStrategy& strategy, InvokeFunc_RefArgs& invokeFunc, MethodBase method, RuntimeType[] argumentTypes, Object obj, IntPtr* args, Boolean backwardsCompat)
   at System.Reflection.MethodBaseInvoker.InvokeWithSharedThunk(Object obj, IntPtr* args)
   at System.Reflection.MethodBaseInvoker.InvokeDirectByRefWithFewArgs(Object obj, Span`1 copyOfArgs, BindingFlags invokeAttr)

Error Message

{
  "ErrorMessage": [
    "[FAIL] System.Diagnostics.Tests.MobileProcessTests.Process_Start_WithStandardHandles_CanRedirectIO(restrictHandles: True)",
    "Assert.Equal() Failure: Values differ",
    "Expected: 0",
    "Actual:   159"
  ],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Filed by ci-failure-scan (detection only). ci-failure-fix walks open [ci-scan] KBEs and either opens a small fix PR or comments here to loop in owners — it never disables the test.

Generated by CI Outer-Loop Failure Scanner · copilot · gpt61 · ~907 AIC · ⌖ ~13 AIC · ⊞ 33.3K · ◷

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