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We previously presented a fault localization technique called value replacement that repeatedly alters the state of an executing program to locate a faulty statement [9]. The technique searches for program statements involving values that can be altered during runtime to cause the incorrect output of a failing run to become correct. We showed that highly effective fault localization results could...
We present a tool called BugFix that can assist developers in fixing program bugs. Our tool automatically analyzes the debugging situation at a statement and reports a prioritized list of relevant bug-fix suggestions that are likely to guide the developer to an appropriate fix at that statement. BugFix incorporates ideas from machine learning to automatically learn from new debugging situations and...
We present a general approach for automatically isolating the root causes of memory-related bugs in software. Our approach is based on the observation that most memory bugs involve uses of corrupted memory locations. By iteratively suppressing (nullifying) the effects of these corrupted memory locations during program execution, our approach gradually isolates the root cause of a memory bug. Our approach...
We are designing scalable dynamic information flow tracking techniques and employing them to carry out tasks related to debugging (bug location and fault avoidance), security (software attack detection), and data validation (lineage tracing of scientific data). The focus of our ongoing work is on developing online dynamic analysis techniques for long running multithreaded programs that may be executed...
In many application areas, including piracy detection, software debugging and maintenance, situations arise in which there is a need for comparing two versions of a program that dynamically behave the same even though they statically appear to be different. Recently dynamic matching [18] was proposed by us which uses execution histories to automatically produce mappings between instructions in the...
Dynamic slicing is a promising trace based technique that helps programmers in the process of debugging. In order to debug a failed run, dynamic slicing requires the dynamic dependence graph (DDG) information for that particular run. In prior work, address and control-flow traces are collected online and then extensively post-processed offline to yield the DDG, upon which slicing is performed. Unfortunately,...
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