A comprehensive study on real world concurrency bugs in Node.js

2017 32nd IEEE/ACM International Conference on Automated Software Engineering (ASE) Pub Date : 2017-10-30 DOI:10.1109/ASE.2017.8115663

Jie Wang, Wensheng Dou, Yu Gao, Chushu Gao, Feng Qin, Kang Yin, Jun Wei

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引用次数: 50

Abstract

Node.js becomes increasingly popular in building server-side JavaScript applications. It adopts an event-driven model, which supports asynchronous I/O and non-deterministic event processing. This asynchrony and non-determinism can introduce intricate concurrency bugs, and leads to unpredictable behaviors. An in-depth understanding of real world concurrency bugs in Node.js applications will significantly promote effective techniques in bug detection, testing and fixing for Node.js. In this paper, we present NodeCB, a comprehensive study on real world concurrency bugs in Node.js applications. Specifically, we have carefully studied 57 real bug cases from open-source Node.js applications, and have analyzed their bug characteristics, e.g., bug patterns and root causes, bug impacts, bug manifestation, and fix strategies. Through this study, we obtain several interesting findings, which may open up many new research directions in combating concurrency bugs in Node.js. For example, one finding is that two thirds of the bugs are caused by atomicity violation. However, due to lack of locks and transaction mechanism, Node.js cannot easily express and guarantee the atomic intention.

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对现实世界中Node.js并发性bug的全面研究

Node.js在构建服务器端JavaScript应用程序方面变得越来越流行。它采用事件驱动模型，支持异步I/O和非确定性事件处理。这种异步性和非确定性会引入复杂的并发性错误，并导致不可预测的行为。深入了解Node.js应用程序中真实世界的并发性bug，将极大地促进有效的bug检测、测试和修复技术。在本文中，我们介绍了NodeCB，这是对Node.js应用程序中真实世界的并发性错误的全面研究。具体来说，我们仔细研究了57个来自开源Node.js应用的真实bug案例，并分析了它们的bug特征，如bug模式和根本原因、bug影响、bug表现、修复策略等。通过这项研究，我们获得了一些有趣的发现，这些发现可能会为解决Node.js中的并发bug开辟许多新的研究方向。例如，一个发现是三分之二的错误是由原子性违反引起的。然而，由于缺乏锁和事务机制，Node.js不能很容易地表达和保证原子意图。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2017 32nd IEEE/ACM International Conference on Automated Software Engineering (ASE)

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