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Configuration used: Repository: RustPython/RustPython/.coderabbit.yml

Review profile: CHILL

Plan: Advanced

Run ID: b2e8ad3c-7252-4469-bfa0-52be45f3bcba

Reviewing files that changed from the base of the PR and between a7d75d2 and 3b43f09.

• crates/vm/src/gc_state.rs
• crates/vm/src/signal.rs
• crates/vm/src/vm/mod.rs

Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 9 remain after this review.

Walkthrough

Threaded automatic GC requests are now associated with individual interpreters and run through the VM bytecode-loop breaker. GC count decrements use a checked atomic update to avoid decrementing an already-zero count.

Changes

Garbage collection scheduling

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant AllocatingInterpreter
  participant GcInterpreterState
  participant VirtualMachine
  participant GlobalCollectionLock
  AllocatingInterpreter->>GcInterpreterState: Schedule request at gen0 threshold
  VirtualMachine->>GcInterpreterState: Check collection_ready()
  GcInterpreterState->>GlobalCollectionLock: Check collector lock
  GcInterpreterState-->>VirtualMachine: Report readiness when unlocked
  VirtualMachine->>GcInterpreterState: Run collect(0)

Suggested reviewers: youknowone

Merge Risk: ⚪ Minimal · up to 3b43f

No established issue remains that would prevent merging after normal checks.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 3b43f

The request now stays with the interpreter that triggered it, and collection still uses the existing coordination controls. No newly exposed security path was established. Collection can still be delayed when an interpreter stops executing bytecode.

Retained concerns
No architecture-level concerns identified.

Security Blast Radius

• inferred — Code able to drive allocations can trigger an automatic GC request for its interpreter. A resulting collection still coordinates with threads process-wide, while object selection remains ownership-filtered.

Trust Boundaries and Controls

• observed — The new dispatch checks the current VM's GC state. Existing enablement and collector-lock checks remain in the collection path; the two-interpreter test checks that servicing one VM does not consume the other's request.

Resilience and Maintainability Implications

• inferred — A pending request is retryable after collector contention, but automatic servicing requires a later bytecode safepoint on that interpreter. The reviewed evidence does not establish prompt finalization for an interpreter that executes no further bytecode.

Hardening Proposals

• proposed — For hosts that rely on prompt GC finalization, establish a resource-bound policy for interpreters that stop reaching bytecode safepoints.

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