{
  "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()` reads `sweep_bytes_reclaimed` and `sweep_blobs_removed` in the opposite order to `COUNTERS` (lines 51-57), so the `/metrics` endpoint renders the blob count under…\n\nvalues()` reads `sweep_bytes_reclaimed` and `sweep_blobs_removed` in the opposite order to `COUNTERS` (lines 51-57), so the `/metrics` endpoint renders the blob count under `cairn_proxy_sweep_bytes_reclaimed_total` and the byte count under `cairn_proxy_sweep_blobs_removed_total`. docs/operations.md directs operators to alert on `cairn_proxy_sweep_bytes_reclaimed_total`, so the alert would fire on blobs instead of bytes — the exact mis-rendering the comment at line 30-32 claims the side-by-side layout prevents.",
      "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 admin route calls `app.sweeper.sweep(dry_run)` directly, bypassing the `running` mutex that only `Sweeper::run` (sweep.rs:83) takes.\n\nAn operator-triggered sweep runs concurrently with the background sweep — exactly the \"two of them over one directory\" interference the module doc (sweep.rs:10-12) promises the type prevents. Both compute `held`/`remaining` from totals the other is concurrently shrinking, so together they can delete roughly twice the excess, dropping the store far below the ceiling either aimed at.",
      "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, but in dry-run mode `gone` is still populated (line 137) while the blob removals were skipped — so `?dry_run=true`, which docs/architecture.md and the…\n\nforget(&index, &gone)` runs unconditionally, but in dry-run mode `gone` is still populated (line 137) while the blob removals were skipped — so `?dry_run=true`, which docs/architecture.md and the route doc promise removes \"without removing anything\", actually deletes the index entries for every blob a sweep would reclaim. Those coordinates then resolve as misses and refetch until relinked, so a \"dry\" probe churns the cache it was meant to size.",
      "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`, including temp files of fetches still in flight — `BlobWriter` (store.rs:171-180) and `BlobStore::link`'s index temp (store.rs:147-152) both live…\n\nclear_partials` unlinks every file in `incoming`, including temp files of fetches still in flight — `BlobWriter` (store.rs:171-180) and `BlobStore::link`'s index temp (store.rs:147-152) both live there while active. The unlink doesn't kill the write (the fd stays valid), but `commit`'s rename (store.rs:259) then fails with ENOENT and the client's fully-downloaded artifact returns a storage 500. The comment at lines 220-223 (\"A file in `incoming` is a fetch that is not coming back\") is wrong for any fetch mid-download when the sweep fires.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 84,
      "end_line": 84,
      "label": "bug",
      "severity": "medium",
      "explanation": "run()` executes the fully synchronous `self.sweep(false)` — a recursive `std::fs` walk that the module doc itself sizes at sixty-five thousand directories — directly on a tokio worker thread.\n\nEvery cache request stalls behind it for the duration of the walk, and the `running` mutex is held across it so an admin sweep queues too. `spawn_blocking` is the fix the doc argues for and then doesn't apply.",
      "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 linked-in blob is counted at its target's size, contradicting the comment at lines 160-163 which claims `symlink_metadata` behavior; and since `meta.is_dir()`…\n\nfs::metadata` follows symlinks, so a linked-in blob is counted at its target's size, contradicting the comment at lines 160-163 which claims `symlink_metadata` behavior; and since `meta.is_dir()` recurses, a symlink loop under `blobs/sha256` makes `collect` recurse until the stack overflows, aborting the process.",
      "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 at cache.rs:151 is not indexed until `link` at cache.rs:163, with a registry round-trip between; a sweep in that window classifies it as unreferenced and deletes it, so the miss…\n\na blob committed at cache.rs:151 is not indexed until `link` at cache.rs:163, with a registry round-trip between; a sweep in that window classifies it as unreferenced and deletes it, so the miss path's reopen at cache.rs:90-97 fails and the client gets the \"blob committed by this request is already missing\" 500 instead of the artifact it just downloaded.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/sweep.rs",
      "start_line": 126,
      "end_line": 126,
      "label": "bug",
      "severity": "low",
      "explanation": "when `fs::remove_file` fails, the blob stays on disk but `remaining`, `bytes`, `removed` and `gone` are all still updated, so the metrics and the route response overcount what was reclaimed and…\n\nwhen `fs::remove_file` fails, the blob stays on disk but `remaining`, `bytes`, `removed` and `gone` are all still updated, so the metrics and the route response overcount what was reclaimed and `forget` (line 140) deletes index entries naming a blob that still exists.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    },
    {
      "path": "services/proxy/src/main.rs",
      "start_line": 108,
      "end_line": 108,
      "label": "bug",
      "severity": "low",
      "explanation": "tokio::time::interval`'s first tick completes immediately, not \"one interval away\" as the doc comment at lines 101-102 claims — a proxy that restarts sweeps a store it has not yet touched, the…\n\ntokio::time::interval`'s first tick completes immediately, not \"one interval away\" as the doc comment at lines 101-102 claims — a proxy that restarts sweeps a store it has not yet touched, the protection the comment describes does not exist. Skipping the first tick (or sleeping first) would be needed for the stated behaviour.",
      "evidence": null,
      "suggested_fix": null,
      "deterministic": false
    }
  ]
}