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ERROR_PROFILING_AT_LIMIT
What ERROR_PROFILING_AT_LIMIT means
This result means the requested profile is valid in principle, but a system, provider, or implementation limit has already been consumed. The limit may be global, per processor, per process, or specific to the profiling mechanism.
Where it commonly appears
- Sampling profilers that use hardware counters
- Diagnostic agents running several simultaneous sessions
- Test farms that fail to tear down a profile between cases
Likely causes
- Another profiler owns the available profiling resource
- A previous session leaked after abnormal termination
- The requested event set requires more counters than the processor exposes
- Multiple workers started profiles without central coordination
Diagnostic checklist
- Enumerate or otherwise identify active profiling sessions when supported
- Check for another profiler, security product, or monitoring agent using the same facility
- Reproduce with a single worker and a minimal event set
- Inspect whether the limit disappears after the owning process exits
Guidance for developers
Serialize access to scarce profiling resources and expose ownership in diagnostics. On this error, do not silently fall back to misleading partial data. Either select a documented lower-cost configuration or report that profiling was not collected.
Guidance for administrators
Stop competing profiling tools and verify that scheduled diagnostics are not overlapping. A restart should be a last resort for leaked kernel state, not the first response.
Example incident
Two CI jobs on the same host both request a hardware-counter profile. The first succeeds and the second receives this status. The durable fix is host-level scheduling or a shared profiling broker, not retries at millisecond intervals.
Related conditions
It is a capacity condition, not the same as access denied. Elevation will not help when the supported profiling slots are already occupied.
Operational decision points
Operational triage should begin by deciding whether the report represents a profiling capacity condition and not merely a transient API failure. For ERROR_PROFILING_AT_LIMIT, the deciding evidence is active owners, requested counters, processor scope, leaked sessions. Preserving this first-occurrence evidence is more useful than increasing retry frequency for investigation sequence 12.
- Impact boundary: identify the exact process, account, device, file, session, host, or connection affected by this result; do not assume the whole machine is in the same state.
- State change required: the next attempt is justified only after the relevant profiling capacity state can differ from the failed attempt.
- Partial outcome: verify whether the operation allocated resources, changed data, sent a request, or modified policy before this result was returned.
- Escalation evidence: preserve active owners, requested counters, processor scope, leaked sessions together with component version and the first preceding failure.
Concrete recovery example
Consider a case where two CI jobs requested the same scarce hardware counters. Repeating the same call leaves the underlying condition unchanged and produces another this result. The durable response is to serialize the jobs or reduce the requested event set. Validation for this Win32 error should use one controlled operation and inspect both the returned status and the resulting state associated with case 12.
Monitoring and validation
A monitoring rule for this Win32 error should distinguish first occurrence from repetition, group events by affected object, and correlate them with deployments or configuration changes. The recovery is complete only when the expected profiling capacity state is present and consistent; absence of another log line by itself is not sufficient proof.
Retain the original this result event until validation for investigation case 12 is complete. After it is corrected, verify that no partial or stale artifact specific to remediation sequence 12 remains before declaring recovery complete. This it-specific verification prevents a hidden secondary problem from surviving after remediation step 12.
References
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