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concurrency-checker

Detect race conditions, deadlocks, and TOCTOU flaws across 7 programming languages.

3|2|Updated Jan 23, 2026
Search Tags:#static analysis#OWASP#concurrency#race conditions#deadlocks#thread safety#race detection
One-click install
npx skills add https://github.com/robotijn/ctoc --skill concurrency-checker
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: concurrency-checker
Source: https://github.com/robotijn/ctoc/tree/main/skills/security/concurrency-checker
Command: npx skills add https://github.com/robotijn/ctoc --skill concurrency-checker

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Concurrency bugs such as race conditions, deadlocks, and TOCTOU flaws are nondeterministic, often evade standard testing, and can cause severe production outages, data corruption, or security breaches. This skill automates the detection of these critical issues across 7 programming languages, eliminating the need for manual, error-prone concurrency reviews and reducing the risk of undetected flaws reaching production.

Core Features & Use Cases

  • Static Pattern Scanning: Identifies common concurrency anti-patterns like lock-across-await, broken double-checked locking, and sleep-based synchronization without requiring runtime instrumentation.
  • Dynamic Race Detector Integration: Invokes language-native tools (Go -race, ThreadSanitizer, Java JFR, etc.) for ambiguous shared-state issues that cannot be resolved via static analysis alone.
  • Cross-Language Coverage: Supports C, C++, Java, Python, C#, JavaScript/TypeScript, Go, and SQL, with language-specific safe/unsafe code pattern examples and OWASP/CWE mapping for all findings.
  • Use Case: For a fintech application handling concurrent financial transactions, this skill catches data races on balance updates and TOCTOU flaws on authorization checks before they can cause financial loss or security incidents.

Quick Start

Use the concurrency-checker skill to scan your project's codebase for concurrency bugs, and receive a prioritized report of findings with clear fix recommendations and OWASP/CWE alignment.

Frequently Asked Questions about concurrency-checker

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I detect race conditions and deadlocks across multiple programming languages?▼

To detect race conditions and deadlocks across 7 languages, you can use static analysis to identify anti-patterns and integrate dynamic race detectors to resolve ambiguous shared-state synchronization issues in your codebase.

What is the best way to scan for TOCTOU flaws and atomicity violations in a CI/CD pipeline?▼

The best way to scan for TOCTOU flaws and atomicity violations in a CI/CD pipeline is applying static code analysis to block concurrency flaws before deployment, satisfying shift-left security testing and OWASP A01/A04 compliance requirements.

Does static analysis work for finding async and thread-safety bugs without runtime instrumentation?▼

Static analysis works for finding async and thread-safety bugs by identifying common concurrency anti-patterns like lock-across-await and broken double-checked locking without requiring runtime instrumentation.

How do dynamic race detectors handle ambiguous shared-state synchronization issues?▼

Dynamic race detectors handle ambiguous shared-state synchronization issues by invoking language-native tools like Go -race, ThreadSanitizer, and Java JFR to validate static analysis findings in production codebases.

Can I map concurrency anti-patterns to OWASP and CWE standards for compliance reporting?▼

You can map concurrency anti-patterns to OWASP and CWE standards, receiving a prioritized report of findings with clear fix recommendations and explicit alignment for A01/A04 compliance across C, C++, Java, Python, C#, JavaScript, TypeScript, Go, and SQL.

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