Unable to read .nettrace file collected by dotnet-trace

文書化されている dotnet-trace collect コマンドで問題を再現し、生成された .nettrace ファイルを PerfView と Visual Studio で開こうとしながら、それらが報告する EventPipe および FastSerialization のエラーを確認します。生成されたこのファイルが拒否される理由を特定し、収集したトレースが影響を受けるツールで正常に開けることを確認できれば完了です。

Description

Collected data using command
dotnet-trace collect --process-id **** --duration 00:00:00:30 --providers Microsoft-DotNETCore-SampleProfiler
But the result .nettrace file was not readable by either Visual Studio nor PerfView.
Visual Studio Log:

CreateEditorInstance
StreamJsonRpc.RemoteInvocationException: Not a understood file format: C:\Users\****\Downloads\w3wp.exe_20250919_140901.nettrace
   at StreamJsonRpc.JsonRpc.<InvokeCoreAsync>d__156`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.DiagnosticsHub.NetTraceDocumentConverter.<ConvertFromAsync>d__10.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.DiagnosticsHub.DocumentsService.<OpenAsConvertedAsync>d__24.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.DiagnosticsHub.DocumentsService.<OpenAsConvertedAsync>d__24.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.DiagnosticsHub.DocumentsService.<OpenAsConvertedAsync>d__24.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.DiagnosticsHub.VisualStudio.Shell.Views.NetTraceEditorFactory.<>c__DisplayClass6_0.<<CreateEditorInstance>b__1>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.Threading.JoinableTask.CompleteOnCurrentThread()
   at Microsoft.VisualStudio.Shell.VsTaskLibraryHelper.Run(JoinableTaskFactory joinableTaskFactory, String waitCaption, Func`3 asyncMethod, Nullable`1 delayToShowDialog)
   at Microsoft.DiagnosticsHub.VisualStudio.Shell.Views.NetTraceEditorFactory.<>c__DisplayClass6_0.<<CreateEditorInstance>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.Shell.VsTaskLibraryHelper.<>c.<<FileAndForget>b__36_0>d.MoveNext()
RPC server exception:
FastSerialization.SerializationException: Not a understood file format: C:\Users\****\Downloads\w3wp.exe_20250919_140901.nettrace
      at FastSerialization.Deserializer.Initialize(IStreamReader reader, String streamName)
      at FastSerialization.Deserializer..ctor(IStreamReader reader, String streamName)
      at Microsoft.Diagnostics.Tracing.EventPipeEventSource.<>c__DisplayClass2_0.<.ctor>b__0()
      at Microsoft.Diagnostics.Tracing.EventPipeEventSource..ctor(PinnedStreamReader streamReader, String name, Boolean isStreaming)
      at Microsoft.Diagnostics.Tracing.EventPipeEventSource..ctor(String fileName)
      at Microsoft.Diagnostics.Tracing.Etlx.TraceLog.CreateFromEventPipeDataFile(String filePath, String etlxFilePath, TraceLogOptions options)
      at Microsoft.DiagnosticsHub.DataWarehouse.ServiceModule.Controllers.DataWarehouseTraceEventServiceController.ConvertAsync(Guid sessionId, ConvertDocumentPayload convertDocumentPayload, List`1 analyzerPayloads, CancellationToken cancellationToken)

PerfView Log:

Started with command line: PerfView.exe  w3wp.exe_20250919_140901.nettrace /ContinueOnError
PerfView Version: 3.1.24  BuildDate: Wed, 27 Aug 2025 11:35:13 GMT
PerfView Start Time 9/19/2025 2:20:41 PM
Started: View
Warning: PdbScope not found at **\Downloads\PerfViewExtensions\PdbScope.exe
Disabling the Image Size Menu Item.
Warning: ILSize not found at **\Downloads\PerfViewExtensions\ILSize.dll
Disabling the IL Size Menu Item.
Completed: View   (Elapsed Time: 0.098 sec)
Started: Opening w3wp.exe_20250919_140901.nettrace
Creating ETLX file **\AppData\Local\Temp\PerfView\w3wp.exe_20250919_140901_cdf8e802.etlx from **\Downloads\w3wp.exe_20250919_140901.nettrace
Error: Exception EventPipe conversion: System.FormatException: Invalid FastSerialization header
   at Microsoft.Diagnostics.Tracing.FastSerializationObjectParser.ValidateFastSerializationHeader()
   at Microsoft.Diagnostics.Tracing.EventPipeEventSource.ParseHeaders()
   at Microsoft.Diagnostics.Tracing.EventPipeEventSource..ctor(Stream stream, Boolean isStreaming)
   at Microsoft.Diagnostics.Tracing.Etlx.TraceLog.CreateFromEventPipeDataFile(String filePath, String etlxFilePath, TraceLogOptions options)
   at PerfView.EventPipePerfViewData.GetTraceLog(TextWriter log, Action`3 onLostEvents)
[Error: exception while opening EventPipe data.]
Completed: Opening w3wp.exe_20250919_140901.nettrace   (Elapsed Time: 0.123 sec)

Configuration

dotnet-trace Windows x64 version 9.0.12.21003 downloaded from https://aka.ms/dotnet-trace/win-x64
Perfview version is 3.1.19
Visual Studio 2022 Community version is 17.0.36407.19

Data collected on Windows Server 2022 x64 version 10.0.20348
Server is running IIS version 10.0
.net core runtime installed on server is 8.0.4