Hmbown/CodeWhale · error · PersistenceBacklogError

baseline provenance platform must be macos

Error message

baseline provenance platform must be macos

What it means

Raised by validate_budget() when baseline_observation.provenance.platform is not exactly 'macos'. The budget's RSS ceilings (rss_during_delta_bytes, rss_after_delta_bytes) are only meaningful on the macOS measurement lane where rss_supported=true, so a baseline produced on Linux or Windows cannot anchor them. The comparison is exact - 'MacOS' or 'darwin' also fail.

Source

Thrown at scripts/check-persistence-backlog-budget.py:302

    baseline_retained = baseline["retained_queued_requests"]
    baseline_payload = baseline["estimated_retained_payload_bytes"]
    if baseline_retained == 0 or baseline_payload == 0:
        raise PersistenceBacklogError(
            "baseline_observation must retain the final request and payload"
        )
    if baseline_retained > baseline_accepted:
        raise PersistenceBacklogError(
            "baseline_observation.retained_queued_requests exceeds accepted_requests"
        )
    if baseline_payload < baseline_retained * FIXTURE["content_bytes_per_request"]:
        raise PersistenceBacklogError(
            "baseline_observation payload is smaller than frozen retained content"
        )
    provenance = baseline.get("provenance")
    if not isinstance(provenance, dict):
        raise PersistenceBacklogError("baseline_observation needs provenance")
    if provenance.get("platform") != "macos":
        raise PersistenceBacklogError("baseline provenance platform must be macos")
    if not isinstance(provenance.get("source_sha"), str) or not SOURCE_SHA_PATTERN.fullmatch(
        provenance["source_sha"]
    ):
        raise PersistenceBacklogError("baseline provenance needs an exact source SHA")
    if provenance.get("source_dirty") is not False:
        raise PersistenceBacklogError("baseline provenance must identify a clean source tree")
    for field, prefix in (("rustc_version", "rustc "), ("cargo_version", "cargo ")):
        if not isinstance(provenance.get(field), str) or not provenance[field].startswith(prefix):
            raise PersistenceBacklogError(f"baseline provenance needs {field}")
    if provenance.get("build_profile") != "test" or not (
        type(provenance.get("sample_count")) is int
        and provenance["sample_count"] == 1
    ):
        raise PersistenceBacklogError("baseline provenance build profile/sample count changed")


def validate_baseline_receipt(
    budget: dict[str, Any], baseline_receipt: dict[str, Any]

View on GitHub (pinned to 8880682c63)

Solutions

1. Re-baseline on macOS from a clean tree whenever baseline numbers change
2. Keep provenance.platform exactly the lowercase string 'macos'
3. Leave the RSS ceilings untouched when iterating on non-macOS lanes

Example fix

// before (budget.json)
"provenance": { "platform": "linux", ... }

// after
"provenance": { "platform": "macos", ... }

def provenance_platform_ok(budget: dict) -> bool:
    provenance = budget.get("baseline_observation", {}).get("provenance", {})
    return provenance.get("platform") == "macos"

When it happens

Trigger: provenance.platform set to 'linux', 'windows', 'darwin', 'MacOS', or missing - typically when a Linux run is used to (re)baseline the budget.

Common situations: Re-baselining on a Linux CI box for convenience; capitalizing or localizing the platform string; renaming platform identifiers during a refactor.

Related errors

• baseline_observation needs provenance
• baseline provenance needs an exact source SHA
• baseline provenance must identify a clean source tree
• baseline provenance needs {field}
• rss_during_delta_bytes is inconsistent

AI-assisted analysis of Hmbown/CodeWhale@8880682c63 (2026-08-16). Data as JSON: /api/errors/5df0d6d3d727e376. Report an issue: GitHub.