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Fix dict concurrency stability#7231

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youknowone merged 1 commit intoRustPython:mainfrom
youknowone:dict
Feb 27, 2026
Merged

Fix dict concurrency stability#7231
youknowone merged 1 commit intoRustPython:mainfrom
youknowone:dict

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@youknowone youknowone commented Feb 27, 2026 •
edited by coderabbitai Bot
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Summary by CodeRabbit

  • Bug Fixes
    • Strengthened internal dictionary operation validation and consistency checks with improved retry mechanisms to enhance reliability during concurrent dictionary operations.

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coderabbitai Bot commented Feb 27, 2026 •
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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

Configuration used: Path: .coderabbit.yml

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 93099e3 and 9113c6e.

📒 Files selected for processing (1)
  • crates/vm/src/dict_inner.rs
📝 Walkthrough

Walkthrough

The dictionary implementation in dict_inner.rs undergoes internal refactoring to improve control flow and consistency handling. Changes include adding slot validation during insertion, implementing early return paths in lookup operations, introducing guard checks to ensure index consistency after potential dict resizing, and reworking insertion logic with lazy default computation.

Changes

Cohort / File(s) Summary
Dictionary Inner Refactoring
crates/vm/src/dict_inner.rs		 Adds slot consistency validation for new key insertions with retry logic on resize. Implements early returns in get/setdefault operations. Introduces guard checks before insertions to verify index consistency, with lazy default computation and explicit return semantics replacing loop-based control flows.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 A rabbit hops through dicts with grace,
Checking slots at just the right pace,
Guard checks keep consistency tight,
Early returns make logic just right,
Retry on resize—perfection's the case! 🎯

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 40.00% which is insufficient. The required threshold is 80.00%. Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (2 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title 'Fix dict concurrency stability' directly addresses the main objective of the PR, which focuses on addressing concurrency issues in dictionary operations through slot validation, guard checks, and integrity verification.

✏️ Tip: You can configure your own custom pre-merge checks in the settings.

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@youknowone youknowone marked this pull request as ready for review February 27, 2026 04:04
@youknowone youknowone merged commit 1fdd4fd into RustPython:main Feb 27, 2026
13 checks passed
@youknowone youknowone deleted the dict branch February 27, 2026 04:23
@coderabbitai coderabbitai Bot mentioned this pull request Feb 27, 2026
Merged
youknowone added a commit to youknowone/RustPython that referenced this pull request Mar 22, 2026
@youknowone
Fix dict concurrency stability (RustPython#7231)
9cd8f9b
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