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AGENTS.md — auto-discovered

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• Configuration used: Repository: RustPython/RustPython/.coderabbit.yml
• Review profile: CHILL
• Plan: Advanced
• Run ID: f0b63e8f-48bf-4701-9302-a672749699ed

Reviewing files that changed from the base of the PR and between 7536730 and 9154f7e.

• crates/vm/src/stdlib/_interpchannels.rs
• extra_tests/snippets/stdlib_subinterpreters.py

Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 6 remain after this review.

Walkthrough

Channel operations now defer releasing queued values until after channel state locks are released. Interpreter listing also snapshots runtime data before locking channel state. A subprocess regression test checks finalizer reentry during channel teardown and timed-out sends.

Changes

Channel item retirement

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix

Suggested reviewers: youknowone

Merge Risk: ⚪ Minimal · up to 9154f

This change moves the release of queued channel payloads outside internal locks so finalizers can safely call back into the channel API. No concrete merge-blocking risk was found in the supplied context, and a regression test covers the affected paths.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 9154f

The change reduces deadlock risk without an identified increase in access or privileges. Residual risk is low because concurrent cleanup and listing behavior are not fully specified or covered.

Retained concerns
No architecture-level concerns identified.

Security Blast Radius

• inferred — The demonstrated failure domain is channel operations and shared payloads within a process-wide interpreter context. The supplied evidence does not establish tenant, service, credential, or deployment-level exposure.

Security Findings and Attack Paths

• inferred — A caller-supplied buffer owner can execute a finalizer during payload retirement. The change removes the demonstrated lock-held reentry hazard; inspected reentrant paths do not establish a new identity bypass or privilege gain.

Trust Boundaries and Controls

• observed — Public destroy and close still resolve the supplied CID before invoking lifecycle helpers. Sending retains channel lookup, closing-state checks, and interpreter association. Unlocking retirement does not replace these checks with caller-provided interpreter identity.

Resilience and Maintainability Implications

• inferred — Queue removal remains serialized, timeout cancellation matches waiter identity, and waiter release preserves the first terminal result while notifying waiters. These controls support failure containment under competing receive and teardown paths, although the conclusion is source-based rather than a completed concurrency test.

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