Test failure: tracing/eventpipe/diagnosticport/diagnosticport/diagnosticport.cmd

[SakeTao]

Failed in: runtime-coreclr outerloop 20250821.7

Failed tests:

R2R-CG2 linux arm64 Checked no_tiered_compilation @ (Alpine.322.Arm64.Open)Ubuntu.2204.ArmArch.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.22-helix-arm64v8
    - tracing/eventpipe/diagnosticport/diagnosticport/diagnosticport.cmd

Error message:

DOTNET_DbgEnableMiniDump is set and the createdump binary does not exist: /root/helix/work/correlation/crossgen2/createdump
DOTNET_DbgEnableMiniDump is set and the createdump binary does not exist: /root/helix/work/correlation/crossgen2/createdump
DOTNET_DbgEnableMiniDump is set and the createdump binary does not exist: /root/helix/work/correlation/crossgen2/createdump
DOTNET_DbgEnableMiniDump is set and the createdump binary does not exist: /root/helix/work/correlation/crossgen2/createdump
Process terminated.
Assertion failed.
currentBlock.m_ChunkOffset == prevBlock.m_ChunkOffset + prevBlock.m_ChunkLength
   at System.Text.StringBuilder.AssertInvariants()
   at System.Text.StringBuilder.ToString()
   at Tracing.Tests.Common.Utils.RunSubprocess(Assembly currentAssembly, Dictionary`2 environment, Func`1 beforeExecution, Func`2 duringExecution, Func`1 afterExecution)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.AsyncStateMachineBox`1.MoveNext(Thread threadPoolThread)
   at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction(IAsyncStateMachineBox box, Boolean allowInlining)
   at System.Threading.Tasks.Task.RunContinuations(Object continuationObject)
   at System.Threading.Tasks.Task`1.TrySetResult(TResult result)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.SetExistingTaskResult(Task`1 task, TResult result)
   at Tracing.Tests.DiagnosticPortValidation.DiagnosticPortValidation.<>c__DisplayClass1_0.<<TEST_MultipleConnectPortsNoSuspend>b__0>d.MoveNext()
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.AsyncStateMachineBox`1.MoveNext(Thread threadPoolThread)
   at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction(IAsyncStateMachineBox box, Boolean allowInlining)
   at System.Threading.Tasks.Task.RunContinuations(Object continuationObject)
   at System.Threading.Tasks.Task.TrySetResult()
   at System.Threading.Tasks.Task.WhenAllPromise.Invoke(Task completedTask)
   at System.Threading.Tasks.Task.RunContinuations(Object continuationObject)
   at System.Threading.Tasks.Task`1.TrySetResult(TResult result)
   at System.Threading.Tasks.UnwrapPromise`1.TrySetFromTask(Task task, Boolean lookForOce)
   at System.Threading.Tasks.UnwrapPromise`1.ProcessInnerTask(Task task)
   at System.Threading.Tasks.Task.RunContinuations(Object continuationObject)
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart()
   at System.Threading.Thread.StartCallback()
waitpid() returned successfully (wstatus 00000000) WEXITSTATUS 0 WTERMSIG 0
/root/helix/work/workitem/e/tracing/tracing/../eventpipe/diagnosticport/diagnosticport/diagnosticport.sh: line 496:  1603 Aborted                 (core dumped) $LAUNCHER $ExePath "${CLRTestExecutionArguments[@]}"

Return code:      1
Raw output file:      /root/helix/work/workitem/uploads/eventpipe/diagnosticport/diagnosticport/output.txt
Raw output:
BEGIN EXECUTION
in takeLock
/root/helix/work/workitem/e/tracing/eventpipe/diagnosticport/diagnosticport/IL-CG2/Microsoft.Diagnostics.NETCore.Client.dll
02:46:46
Response file: /root/helix/work/workitem/e/tracing/eventpipe/diagnosticport/diagnosticport/Microsoft.Diagnostics.NETCore.Client.dll.rsp
/root/helix/work/workitem/e/tracing/eventpipe/diagnosticport/diagnosticport/IL-CG2/Microsoft.Diagnostics.NETCore.Client.dll
-o:/root/helix/work/workitem/e/tracing/eventpipe/diagnosticport/diagnosticport/Microsoft.Diagnostics.NETCore.Client.dll
-O
--targetarch:arm64
--targetos:linux
--verify-type-and-field-layout
--method-layout:random
-r:/root/helix/work/correlation/System.*.dll
-r:/roo

Stack trace:

   at Xunit.Assert.True(Nullable`1 condition, String userMessage) in /_/src/arcade/src/Microsoft.DotNet.XUnitAssert/src/BooleanAsserts.cs:line 141
   at TestLibrary.OutOfProcessTest.RunOutOfProcessTest(String assemblyPath, String testPathPrefix)
   at Program.<<Main>$>g__TestExecutor17|0_18(StreamWriter tempLogSw, StreamWriter statsCsvSw, <>c__DisplayClass0_0&)

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[steveisok]

Something is causing the stdout StringBuilder contents to get corrupted. Either a subprocess race or junky output in musl.