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George Candea

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Related publications (67)

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Making Automated Testing of Cloud Applications an Integral Component of PaaS

George Candea, Johannes Kinder, Stefan Bucur

Traditional testing is inadequate for the complexity of modern cloud application software stacks. While the platform-as-a-service (PaaS) model has streamlined application development and deployment, its multiple abstraction layers and dependencies have mad ...

2013

Platform-wide Deadlock Immunity for Mobile Phones

George Candea, Horatiu Jula

We present an implementation of our deadlock immunity system, Dimmunix, for mobile phone software. Within Android 2.2 OS, we modiﬁed Dalvik VM, the JVM running all the Android applications, to provide platform-wide deadlock immunity. We successfully ran th ...

2011

WaRR: A Tool for High-Fidelity Web Application Record and Replay

George Candea, Silviu Andrica

We introduce WaRR, a tool that records and replays with high ﬁdelity the interaction between users and modern web applications. WaRR consists of two independent components: the WaRR Recorder and the WaRR Replayer. The WaRR Recorder is embedded in a web bro ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2011

Automated Software Testing as a Service (TaaS)

George Candea, Cristian Zamfir, Stefan Bucur

This paper makes the case for TaaS - automated software testing as a cloud-based service. We present three kinds of TaaS: (1) a public certification service, akin to Underwriters Labs, that independently assesses the reliability, safety, and security of so ...

2010

Parallel symbolic execution on cluster of commodity hardware

George Candea, Cristian Zamfir, Stefan Bucur

A symbolic execution task is dynamically divided among multiple computing nodes. Each of the multiple computing nodes explores a different portion of a same symbolic execution tree independently of other computing nodes. Workload status updates are receive ...

2014

Efficient State Merging in Symbolic Execution

George Candea, Johannes Kinder, Volodymyr Kuznetsov, Stefan Bucur

Symbolic execution has proven to be a practical technique for building automated test case generation and bug finding tools. Nevertheless, due to state explosion, these tools still struggle to achieve scalability. Given a program, one way to reduce the num ...

Assoc Computing Machinery2012

Efficient State Merging in Symbolic Execution

George Candea, Johannes Kinder, Volodymyr Kuznetsov, Stefan Bucur

ACM2012

Data Races vs. Data Race Bugs: Telling the Difference with Portend

George Candea, Cristian Zamfir, Baris Can Cengiz Kasikci

Even though most data races are harmless, the harmful ones are at the heart of some of the worst concurrency bugs. Alas, spotting just the harmful data races in programs is like finding a needle in a haystack: 76%-90% of the true data races reported by sta ...

Acm Order Department, P O Box 64145, Baltimore, Md 21264 Usa2012

The Case for Energy Clarity

Fan Chung, Henry Kuo, George Candea

The rapid expansion of cloud computing, especially machine learning, is leading to a significant increase in the global energy footprint of computing. Improvements in the energy efficiency of hardware and infrastructure are nearing the point of diminishing ...

ACM2025

Parallel symbolic execution for automated real-world software testing

George Candea, Vlad Ureche, Cristian Zamfir, Stefan Bucur

This paper introduces Cloud9, a platform for automated testing of real-world software. Our main contribution is the scalable parallelization of symbolic execution on clusters of commodity hardware, to help cope with path explosion. Cloud9 provides a system ...

ACM Press2011

Verifying Software Network Functions with No Verification Expertise

George Candea, Aikaterini Argyraki, Solal Vincenzo Pirelli, Luis David Figueiredo Mascarenhas Moreira Pedrosa, Rishabh Ramesh Iyer

We present the design and implementation of Vigor, a software stack and toolchain for building and running software network middleboxes that are guaranteed to be correct, while preserving competitive performance and developer productivity. Developers write ...

ACM2019

Toward Self-Healing Multitier Services

George Candea

Are self-healing database-centric multitier services utopia or just a hard puzzle? We argue for the latter and aim to identify the missing pieces of this puzzle. We advocate robust and scalable learning-based approaches to self-healing that we expect to wo ...

2007

Code-Pointer Integrity

George Candea, Mathias Josef Payer, Volodymyr Kuznetsov

Systems code is often written in low-level languages like C/C++, which offer many benefits but also delegate memory management to programmers. This invites memory safety bugs that attackers can exploit to divert control flow and compromise the system. Depl ...

2014

Automated Vulnerability Discovery in Distributed Systems

Rachid Guerraoui, George Candea, Radu Banabic

In this paper we present a technique for automatically assessing the amount of damage a small number of participant nodes can inﬂict on the overall performance of a large distributed system. We propose a feedback-driven tool that synthesizes malicious node ...

2011

CoRD: A Collaborative Framework for Distributed Data Race Detection

George Candea, Cristian Zamfir, Baris Can Cengiz Kasikci

Modern concurrent software is riddled with data races and these races constitute the source of many problems. Data races are hard to detect accurately before software is shipped and, once they cause failures in production, developers find it challenging to ...

Usenix2012

Debug Determinism: The Sweet Spot for Replay-Based Debugging

George Candea, Cristian Zamfir

Deterministic replay tools offer a compelling approach to debugging hard-to-reproduce bugs. Recent work on relaxed-deterministic replay techniques shows that replay debugging with low in-production overhead is possible. However, despite considerable progre ...

2011

Automatically Reasoning About How Systems Code Uses the CPU Cache

George Candea, Aikaterini Argyraki, Rishabh Ramesh Iyer

We present a technique, called CFAR, that developers can use to reason precisely about how their code, as well as third-party code, uses the CPU cache. Given a piece of systems code P, CFAR employs program analysis and binary instrumentation to automatical ...

2024

An Extensible Technique for High-Precision Testing of Recovery Code

George Candea, Radu Banabic

Thorough testing of software systems requires ways to productively employ fault injection. We describe a technique for automatically identifying the errors exposed by shared libraries, finding good injection targets in program binaries, and producing corre ...

2010

Exterminating Bugs via Collective Information Recycling

George Candea

End-user software is executed billions of times daily, but the corresponding execution details (“by-products”) are discarded. We hypothesize that, if suitably captured and aggregated, these by-products could substantially speed up the process of testing pr ...

2011

A Scalable, Sound, Eventually-Complete Algorithm for Deadlock Immunity

George Candea, Horatiu Jula

We introduce the concept of deadlock immunity—a program's ability to avoid all deadlocks that match patterns of deadlocks experienced in the past. We present here an algorithm for enabling large software systems to automatically acquire such immunity witho ...

2008