{
  "sha": "9b51f95ef609a219e211e37b082cd2e6913190e0",
  "model": "z-ai/glm-5.3-flash",
  "effort": "high",
  "found_per_pass": {
    "agent": 9
  },
  "findings": [
    {
      "path": "services/proxy/src/metrics.rs",
      "start_line": 94,
      "end_line": 94,
      "label": "bug",
      "severity": "critical",
      "explanation": "values()` returns `sweep_bytes_reclaimed` and `sweep_blobs_removed` in the opposite order to `COUNTERS` (metrics.rs:51-57), so `render()`'s zip publishes the blob count under…\n\nvalues()` returns `sweep_bytes_reclaimed` and `sweep_blobs_removed` in the opposite order to `COUNTERS` (metrics.rs:51-57), so `render()`'s zip publishes the blob count under `cairn_proxy_sweep_bytes_reclaimed_total` and the byte count under `cairn_proxy_sweep_blobs_removed_total`. operations.md tells operators to alert on the bytes counter specifically, so the alert reads blob counts (e.g. 12 blobs) as bytes reclaimed.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 232,
      "end_line": 232,
      "label": "bug",
      "severity": "high",
      "explanation": "clear_partials` unlinks every file in `incoming/` with no age check, but that is where `BlobWriter` (store.rs:201-206) keeps the temp file of a fetch currently in progress.\n\nA 200 MiB download spanning a sweep loses its file mid-write; `commit`'s rename then fails on a path that no longer exists and the whole fetch errors after all bytes were transferred. Every sweep interval kills every in-flight download.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 140,
      "end_line": 140,
      "label": "bug",
      "severity": "high",
      "explanation": "forget(&index, &gone)` runs unconditionally, including for a dry run, so `?dry_run=true` — documented in admin.rs:58-60 as reporting what a sweep \"would reclaim without removing anything\" — still…\n\nforget(&index, &gone)` runs unconditionally, including for a dry run, so `?dry_run=true` — documented in admin.rs:58-60 as reporting what a sweep \"would reclaim without removing anything\" — still deletes the index entries for every digest it would have removed. The dry run is a write, and each dry run forces a refetch (and re-link) of every blob it merely reported on.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/routes/admin.rs",
      "start_line": 76,
      "end_line": 76,
      "label": "bug",
      "severity": "high",
      "explanation": "the on-demand route calls `sweeper.sweep(dry_run)` directly instead of `sweeper.run().await`, bypassing the `running` mutex (sweep.rs:82-85) that exists precisely so two sweeps never interleave.\n\nA manual sweep concurrent with the background one makes both compute removals from a total the other is already shrinking, over-evicting past the ceiling and double-counting bytes in the metrics.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/routes/admin.rs",
      "start_line": 76,
      "end_line": 76,
      "label": "bug",
      "severity": "high",
      "explanation": "the synchronous directory walk and unlinks (sweep.rs:90-149) run inline on a tokio worker thread; on a store with tens of thousands of blobs the module's own estimate (sweep.rs:14-17) this blocks a…\n\nthe synchronous directory walk and unlinks (sweep.rs:90-149) run inline on a tokio worker thread; on a store with tens of thousands of blobs the module's own estimate (sweep.rs:14-17) this blocks a runtime worker for minutes while serving requests, and the route is deliberately exempted from the `TimeoutLayer` (routes/mod.rs:122-130) so nothing bounds it. It belongs in `run()` under `spawn_blocking` (or the lock held across a blocking task).",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 119,
      "end_line": 119,
      "label": "bug",
      "severity": "medium",
      "explanation": "a blob committed by an in-flight fetch between the `referenced()` snapshot (sweep.rs:92) and the unlink loop is absent from the index map and is deleted as unreachable, even though its index entry…\n\na blob committed by an in-flight fetch between the `referenced()` snapshot (sweep.rs:92) and the unlink loop is absent from the index map and is deleted as unreachable, even though its index entry is written moments later — so `forget` (sweep.rs:140) then deletes that fresh entry too. On a long sweep of a busy store this evicts just-fetched packages, defeating the `CAIRN_CACHE_MIN_AGE` grace the docs promise.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 134,
      "end_line": 134,
      "label": "bug",
      "severity": "medium",
      "explanation": "when `fs::remove_file` fails (sweep.rs:126-131), the candidate is still counted: `remaining` is reduced, `bytes` and `removed` incremented, and its digest pushed to `gone`.\n\nA blob that was already gone via a purge gets reported as reclaimed bytes the store never gave up, and `remaining` then under-counts the true store size, letting a sweep stop while the store is still over its ceiling.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 164,
      "end_line": 164,
      "label": "bug",
      "severity": "medium",
      "explanation": "fs::metadata` follows symlinks, so a symlinked blob is counted at its target's size, contradicting the comment at sweep.rs:160-163 which claims links are counted at the link's own size…\n\nfs::metadata` follows symlinks, so a symlinked blob is counted at its target's size, contradicting the comment at sweep.rs:160-163 which claims links are counted at the link's own size (`fs::symlink_metadata` would be needed for that). A store assembled with hard/sym links is measured against the wrong total for the ceiling.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/config.rs",
      "start_line": 131,
      "end_line": 131,
      "label": "bug",
      "severity": "low",
      "explanation": "CAIRN_SWEEP_INTERVAL` is validated for zero but `CAIRN_CACHE_MIN_AGE` is not, so `CAIRN_CACHE_MIN_AGE=0` silently disables the grace period that operations.md presents as protecting a package…\n\nCAIRN_SWEEP_INTERVAL` is validated for zero but `CAIRN_CACHE_MIN_AGE` is not, so `CAIRN_CACHE_MIN_AGE=0` silently disables the grace period that operations.md presents as protecting a package between pipeline jobs.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    }
  ]
}