Software aging is a problem of progressive degradation of performance and dependability in computer programs, especially those executing for long period of time. This phenomenon has been extensively studied for more than 20 years, as it affects many systems, from embedded devices to server software to critical systems.

Software rejuvenation, i.e., proactive restart of application (components/threads/task), reboot of VMs or machines, and failover to a replica are the most prominent approach es to combat software aging. A variety of rejuvenation techniques, scheduling plans, scope and granularity, have been proposed for different application types and platforms.

WoSAR is the premier international venue to discuss the recent advances and discoveries in theoretical and practical aspects of software aging and rejuvenation research. In this year, we encourage submissions targeting interdisciplinary research, in particular those listed in the topics of interest.


This call for papers addresses all researchers and practitioners with an interest about performance and dependability degradation of software systems. Topics addressed in the workshop include but are not limited to:

  • Progressive degradation of performability / availability / reliability / scalability / “-ilities” in software systems.

  • On-line feedback control view of software rejuvenation.

  • Modeling and characterization of the software aging phenomenon.

  • Design and evaluation of rejuvenation techniques.

  • Analysis of aging-related faults/bugs, errors, and failures.

  • Software test strategies for detecting aging-related bugs.

  • Monitoring, detection and data analysis of software aging effects (e.g., memory leaks, database index fragmentation, unterminated processes/threads, accrual of round-off errors, ...).

  • New classes of software aging effects.

  • Software aging and rejuvenation applied to anomaly detection and security intrusions.

  • Software aging and rejuvenation in Big Data and IoT Apps.

  • Prognostics and Health Management (PHM) interactions with software aging and rejuvenation approaches.

  • Environment dependent bugs and their mitigation techniques.

  • Metrics for software performance and degradation.

  • Fault localization and testing for aging-related bugs.

  • Software refactoring for aging-related software problems.

  • Clone detection in aging software.

  • Machine learning techniques for aging-related bugs.

  • Tools for detection and repair of memory leaks.

  • Analytical, empirical, and experimental studies of any of the above topics.

  • Software aging monitoring and Software rejuvenation techniques for unmanned vehicles like Drones or Cars.

  • Software aging and rejuvenation techniques for humans in safety critical environments, like large warehouses.

  • Other software aging related phenomena, as for example, age of information.

For all the above topics, WoSAR is a unique forum to discuss the software aging and rejuvenation impacts on systems from different domains of applicability such as:

Cloud computing, Mobile Edge Computing, Fog computing, Mobile, Machine learning systems, Embedded, Medical, Cyber-physical systems, Cyber-Security, Industrial control systems such as SCADA, Smart Grids, Smart Infrastructures, Smart Cities, Transportation, Telecommunication, Military, System of systems, Databases, High Performance Computing, Software Defined Networks, and others.


Paper submission deadline: August 3rd, 2021

Paper notification: August 21st, 2021

Camera ready papers: August 28th, 2021


Authors are invited to submit high quality unpublished research work describing the results of theoretical and experimental software aging and rejuvenation research. All the accepted papers will be included in the IEEE Xplore Digital Library.

Papers must be written in English and be formatted according to the IEEE authoring guidelines ( Full papers should not exceed eight pages ( seven pages plus one page for references) in IEEE style. Paper submission will be done electronically through EasyChair (

Special Session on Invited Journal Papers

There will be a special session titled “Invited Journal Papers” at WoSAR 2021. During this session, researchers will have the opportunity to present any of their recently published peer-reviewed journal articles. For an article to be considered in this session, it must have been published between January 1, 2015 and August 15, 2021.

Researchers interested in presenting their work in this session, must send email to beto at esulabsolutions dot com with the following information, by 11:59 pm Pacific Time on July 15, 2021.

1) A copy of the refereed journal article

2) One paragraph description of the technical significance of this article in the fields related to SAR

3) Short biography of the presenting author

Authors, whose papers are selected, must be registered for the conference in order to present their paper. Note that the selected papers will NOT be reprinted nor archived by WoSAR 2021. Paper submission deadline: August 3rd, 2021. Paper notification: August 21st, 2021


Authors are invited to submit position papers describing challenges and work in progress in software aging and rejuvenation research. All the accepted position papers will be included in the IEEE Xplore Digital Library.

Position papers must be written in English and be formatted according to the IEEE authoring guidelines. Position papers should not exceed four pages in IEEE style. Paper submission will be done electronically through EasyChair.


Honorary General Co-Chairs:

Kishor S. Trivedi, Duke University, USA

Tadashi Dohi, Hiroshima University, Japan

General Co-Chairs:

Rivalino Matias, Federal University of Uberlandia, Brazil

Jianwen Xiang, Wuhan University of Technology, China

Program Committee Co-Chairs:

Alberto Avritzer, eSulabSolutions, USA

Xiaoyuan Xie, Wuhan University, China

Publication Chair:

Fumio Machida, University of Tsukuba, Japan

Publicity Co-Chairs:

Vasilis Koutras, University of the Aegean, Greece

Junjun Zheng, Ritsumeikan University, Japan

Jean Araujo, Federal University of Agreste of Pernambuco, Brazil

Fangyun Qin, Capital Normal University, China

Antonio Ken Iannillo, University of Luxembourg, Luxembourg

Javier Alonso, Amazon, USA

Ricardo M. Czekster, Newcastle University, UK

Finance Chair:

Artur Andrzejak, Heidelberg University, Germany

Web Master:

Xiaoting Du, Beihang University, China


Alberto Avritzer, eSulabSolutions

Paulo Maciel, Universidade Federal de Pernambuco

Xiaoyuan Xie, School of Computer Science, Wuhan University

Domenico Cotroneo, University of Naples Federico II

Rivalino Matias, Federal University of Uberlandia

Stefano Russo, University of Naples Federico II

Xiaolin Chang, Beijing Jiaotong University

Roberto Pietrantuono, University of Naples Federico II

Vasilis Koutras, University of the Aegean

Fumio Machida, University of Tsukuba

Lance Fiondella, University of Massachusetts

Kalyan Vaidyanathan, BAE Systems

Daniel Sadoc Menasché, Department of Computer Science at Federal University of Rio de Janeiro

Hiroshi Yamada, Tokyo University of Agriculture and Technology

Junjun Zheng, Ritsumeikan University

Marco Scarpa, University of Messina - Department of Engineering

Sandip Homchaudhuri, Qualcomm Technologies Inc (QTI)

Agapios Platis, University of the Aegean

Veena Mendiratta, Northwestern University

Michael Grottke, Friedrich-Alexander-Universität Erlangen-Nürnberg

Manoj Nambiar, Tata Consultancy Services

Hiroyuki Okamura, Hiroshima University, Japan

Artur Andrzejak, Heidelberg University

Jinghui Li, Huawei

Roberto Natella, University of Naples Federico II

Kenji Kono, Keio University

Kishor Trivedi, Duke University