Emit assemblyName payload for FallbackAssemblyLoad EventSource events - #14014
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AR-May merged 2 commits intoAug 3, 2026
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FallbackAssemblyLoadStart/Stop (events 97/98) declared an assemblyName parameter but called WriteEvent(97)/WriteEvent(98) without passing it, so the payload was silently dropped in ETW/EventPipe traces. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Pull request overview
Fixes MSBuild’s Microsoft-Build EventSource so FallbackAssemblyLoadStart/Stop (EventIds 97/98) actually emit their declared assemblyName payload to ETW/EventPipe, instead of dropping it due to calling WriteEvent without arguments.
Changes:
- Pass
assemblyNameintoWriteEvent(97, ...)forFallbackAssemblyLoadStart. - Pass
assemblyNameintoWriteEvent(98, ...)forFallbackAssemblyLoadStop.
AR-May
commented
Jun 10, 2026
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AR-May
enabled auto-merge (squash)
August 3, 2026 08:10
JanProvaznik
approved these changes
Aug 3, 2026
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Context
FallbackAssemblyLoadStartandFallbackAssemblyLoadStopevents declare anassemblyNameparameter but callWriteEventwithout it. The payload is dropped before reaching ETW, so every trace consumer sees an empty payload.Testing
Existing unit tests