𝗧𝗼𝗱𝗮𝘆 𝘄𝗲’𝗿𝗲 𝗹𝗼𝗼𝗸𝗶𝗻𝗴 𝗶𝗻𝘁𝗼 𝘁𝗵𝗲 𝗔𝘁𝗼𝗺𝗶𝗰𝗶𝘁𝘆 𝗩𝗶𝗼𝗹𝗮𝘁𝗶𝗼𝗻 𝗖𝗵𝗲𝗰𝗸𝗲𝗿: Our fourth Rust checker in the ongoing Chain-Fox thread series on concurrency and safety issues in Rust projects. Subtle concurrency bugs can silently undermine your systems. Our next tool brings them to light. This marks the continuation of our deep dive into Chain-Fox checkers for Rust.🧵

𝗪𝗵𝗮𝘁 𝗱𝗼𝗲𝘀 𝘁𝗵𝗶𝘀 𝗰𝗵𝗲𝗰𝗸𝗲𝗿 𝗱𝗼 It detects potential race conditions caused by interleaved atomic operations in multi-threaded Rust programs Atomic operations that seem safe in isolation can violate logic when combined without proper synchronization.

𝗧𝗵𝗲 𝗽𝗿𝗼𝗯𝗹𝗲𝗺 When multiple atomic operations access the same variable, and those accesses are interleaved by another thread’s atomic operations, it may break program invariants. This results in logic bugs that are hard to reproduce and even harder to debug.

𝗪𝗵𝘆 𝗶𝘁 𝗺𝗮𝘁𝘁𝗲𝗿𝘀 These bugs do not crash your program They cause it to behave incorrectly In blockchain systems or concurrent applications, that can lead to lost messages, broken consensus or stale state.

𝗛𝗼𝘄 𝘁𝗵𝗲 𝗰𝗵𝗲𝗰𝗸𝗲𝗿 𝘄𝗼𝗿𝗸𝘀 The Atomicity Violation Checker analyzes the Mid-level Intermediate Representation MIR of your Rust code It identifies patterns where atomic ops lack proper synchronization It reports: • The types of the atomic operations • The code locations where they occur

𝗥𝗲𝗮𝗹-𝘄𝗼𝗿𝗹𝗱 𝗶𝗺𝗽𝗮𝗰𝘁 This is not just theory. Here’s a bug we uncovered in parity-ethereum 𝗙𝗶𝘅 𝗮𝘁𝗼𝗺𝗶𝗰𝗶𝘁𝘆 𝘃𝗶𝗼𝗹𝗮𝘁𝗶𝗼𝗻 𝗶𝗻 𝗻𝗲𝘁𝘄𝗼𝗿𝗸-𝗱𝗲𝘃𝗽𝟮𝗽 by Chain-Fox · Pull Request #11277 openethereum/parity-ethereum

𝗪𝗵𝘆 𝗶𝘁 𝗶𝘀 𝗰𝗿𝘂𝗰𝗶𝗮𝗹 𝗳𝗼𝗿 𝗥𝘂𝘀𝘁 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿𝘀 • Rust gives memory safety but concurrency remains a logic minefield • Atomic ops can silently interact across threads • Our checker catches what the compiler cannot Build correct concurrent code with confidence

𝗦𝗼 𝗳𝗮𝗿 𝘄𝗲’𝘃𝗲 𝗲𝘅𝗽𝗹𝗮𝗶𝗻𝗲𝗱 𝗳𝗼𝘂𝗿 𝗥𝘂𝘀𝘁 𝗰𝗵𝗲𝗰𝗸𝗲𝗿𝘀 𝗶𝗻 𝘁𝗵𝗲 𝗖𝗵𝗮𝗶𝗻-𝗙𝗼𝘅 𝘀𝘂𝗶𝘁𝗲 • Double-Lock Checker • Conflict-Lock Checker • Condvar Misuse Checker • Atomicity Violation Checker More are on the way. We’ll cover the next one in our upcoming thread.

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