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…ried blob `sizes_for_keys` snapshotted `lru.len()` once for the whole batch and reused that stale length in `should_evict` for every key in the loop. When the map sits one entry over `max_count` — e.g. an action-input lease (or a TTL-pending entry) pins it at `max_count + 1` — the first unleased queried key is popped, bringing the real length back to `max_count`. But iterations 2..N still saw the stale `lru_len == max_count + 1`, so `is_over_count` stayed true and every remaining queried, unleased entry was popped too: remove-callbacks queued, `FileEntryImpl` unref deleting the backing files. The batch then reports `None` for all N digests, the client treats them as absent and re-uploads, and a plain existence check (`has()` → FilesystemStore → `sizes_for_keys`) has destroyed every resident blob it was only asked about. Fix: keep a mutable working count and decrement it as entries are reaped, so the over-count predicate is re-evaluated against the current length each iteration. Eviction now stops the moment the map is back at/under the limit — a size/existence query evicts at most the genuine overage and never cascades. Adds a white-box regression test that pins the map one over `max_count` with a leased entry (bypassing the insert-time eviction pass the way a held lease does) and asserts a batch `sizes_for_keys` over the resident keys leaves all but the single-entry overage present. It fails on the stale-len code (all N reported missing) and passes with the fix. Provenance: adversarial review fleet, highest-severity finding. Co-Authored-By: Claude Fable 5 <[email protected]>
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Landed upstream as TraceMachina#2840. Closing. |
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What and why
Lane A stability fix from the findings catalog (see
nativelink-findings-2026-10-05.csvon the
meta/findings-catalog-2026-10-05branch), rebased onto OSS main@bf4b3aa855. This fork PR exists to validate the change on CI that is
representative of upstream PR lanes (public read-only cache, same endpoints)
before any upstream submission.
How was this verified?
The branch carries its own regression tests (fails-without where the fix
class allows it — see the branch's test commits). This PR's purpose is the
full representative CI run; green here rehearses the exact checks an
upstream PR would face.
Risk
Fork-internal validation PR; nothing lands anywhere by merging this. The
underlying fix's risk assessment happens at upstream-submission time.
AI assistance
Agent-assisted pipeline (Claude) for rebase and PR mechanics under my
direction; the fix itself carries verification in its tests.