What does HRESULT 0x87C51027 (UTC_E_TRACE_BUFFER_LIMIT_EXCEEDED) mean?

UTC_E_TRACE_BUFFER_LIMIT_EXCEEDED

Read this as a lifecycle result: ETW trace-profile buffer budget

The code UTC_E_TRACE_BUFFER_LIMIT_EXCEEDED (0x87C51027) belongs to ETW trace-session control, inside the Universal Telemetry Client/DiagTrack workflow. Treat this HRESULT as a state-machine report, not as a generic telemetry outage. It identifies ETW trace-profile buffer budget and reports that the profile requests more trace-buffer memory than the client permits or can reserve; it does not by itself prove that all Windows diagnostic data collection is unavailable.

What distinguishes this value: “The trace profile needs more memory than is available for tracing”. Capture evidence for that condition directly so a similar result from the same facility is not confused with this result.

The Universal Telemetry Client controls ETW sessions on behalf of diagnostic scenarios. ETW sessions have controller-owned names, in-memory buffers, providers, logging modes and lifetimes; a status at this layer should be correlated with the actual session list rather than inferred from the presence of an ETL file.

Diagnostic record

Isolate one changing condition

1. Associate this result with one request, one scenario version and one service process ID.
2. Save buffer size/count, logging mode, provider count, stackwalk settings, system memory and competing sessions and the first lower-level HRESULT if one exists.
3. Change no policy, provider set or destination except for this test: reduce one buffer or stackwalk parameter at a time and start the same profile.
4. Compare the produced artifacts and operational events, not only the top-level return value.

Nearby result: UTC_E_EXCLUSIVITY_NOT_AVAILABLE — is session arbitration rather than memory-budget rejection.

Trace-session note

Use an ETW controller view to list session name, GUID, mode, buffers and enabled providers while this result is active. The presence of an ETL file from an earlier run is not proof that the required in-memory session currently exists or is owned by UTC.

Operational response

Right-size the profile or stop an owning capture; deleting existing ETL files does not reduce in-memory buffers.

Technical references

• Microsoft Open Specifications: Windows error-code registry — reference for ETW trace-session control while interpreting this result.
• Microsoft: Universal Telemetry Client configuration diagnosis — reference for ETW trace-session control while interpreting it.
• Microsoft: Event Tracing for Windows
• Microsoft: WPR and ETW sessions