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Race Condition

Shared mutable state is accessed from concurrent contexts without synchronization, producing nondeterministic behavior.
共享可变状态在并发环境中未同步访问,导致不确定行为。
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概述

race-condition

Two or more concurrent contexts — threads, async tasks, processes, requests — read and write the same state without coordination. Tests pass on a lightly-loaded machine; production corruption appears under real traffic.

Symptoms

  • Counters that "mostly" work but occasionally lose increments.
  • Check-then-act sequences (e.g., "if not exists, create") where two contexts both pass the check and both create.
  • Shared caches or singletons mutated from request handlers without a lock.
  • Data-corruption bugs that only reproduce under load or with specific timing.

What to do

  • Identify every piece of shared mutable state. Draw the boundary: who reads it, who writes it, from which contexts.
  • Replace check-then-act with atomic operations: compare-and-swap, INSERT ... ON CONFLICT, unique indexes, setnx.
  • Prefer immutable data or message-passing over shared mutation. Actor-style patterns remove most races by construction.
  • When a lock is unavoidable, hold it for the shortest possible span and document what state it protects.
  • Test concurrency explicitly. A single-threaded test proves nothing about a multi-threaded code path. Use stress tests or pytest-asyncio / concurrent harnesses.

版本历史

共 1 个版本

  • v1.0.0 当前
    2026-05-08 01:34 安全 安全

安全检测

腾讯云安全 (Keen)

安全,无风险
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腾讯云安全 (Sanbu)

安全,无风险
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