REPT: Reverse Debugging of Failures in Deployed Software


Weidong Cui and Xinyang Ge, Microsoft Research Redmond; Baris Kasikci, University of Michigan; Ben Niu, Microsoft Research Redmond; Upamanyu Sharma, University of Michigan; Ruoyu Wang, Arizona State University; Insu Yun, Georgia Institute of Technology
Awarded Best Paper!


Debugging software failures in deployed systems is important because they impact real users and customers. However, debugging such failures is notoriously hard in practice because developers have to rely on limited information such as memory dumps. The execution history is usually unavailable because high-fidelity program tracing is not affordable in deployed systems.

In this paper, we present REPT, a practical system that enables reverse debugging of software failures in deployed systems. REPT reconstructs the execution history with high fidelity by combining online lightweight hardware tracing of a program's control flow with offline binary analysis that recovers its data flow. It is seemingly impossible to recover data values thousands of instructions before the failure due to information loss and concurrent execution. REPT tackles these challenges by constructing a partial execution order based on timestamps logged by hardware and iteratively performing forward and backward execution with error correction.

We design and implement REPT, deploy it on Microsoft Windows, and integrate it into Windows Debugger. We evaluate REPT on 16 real-world bugs and show that it can recover data values accurately (92% on average) and efficiently (less than 20 seconds) for these bugs. We also show that it enables effective reverse debugging for 14 bugs.

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@inproceedings {222595,
author = {Weidong Cui and Xinyang Ge and Baris Kasikci and Ben Niu and Upamanyu Sharma and Ruoyu Wang and Insu Yun},
title = {{REPT}: Reverse Debugging of Failures in Deployed Software},
booktitle = {13th USENIX Symposium on Operating Systems Design and Implementation (OSDI 18)},
year = {2018},
isbn = {978-1-939133-08-3},
address = {Carlsbad, CA},
pages = {17--32},
url = {},
publisher = {USENIX Association},
month = oct

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