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etw-event-names-cannot-differ-only-by-suffix.md

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etw-event-names-cannot-differ-only-by-suffix.md

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ETW event names cannot differ only by a "Start" or "Stop" suffix

Scope

Edge

Version Introduced

4.6

Version Reverted

4.6.2

Source Analyzer Status

NotPlanned

Change Description

In the .NET Framework 4.6 and 4.6.1, the runtime throws an xref:System.ArgumentException when two Event Tracing for Windows (ETW) event names differ only by a "Start" or "Stop" suffix (as when one event is named LogUser and another is named LogUserStart). In this case, the runtime cannot construct the event source, which cannot emit any logging.

  • Quirked
  • Build-time break

Recommended Action

To prevent the exception, ensure that no two event names differ only by a "Start" or "Stop" suffix.

This requirement is removed starting with the .NET Framework 4.6.2; the runtime can disambiguate event names that differ only by the "Start" and "Stop" suffix.

Affected APIs

  • Not detectable via API analysis

Category

Core