Debugging is difficult and costly. As a programmer looks for a bug, it would be helpful to see a complete trace of events leading to the point of failure. Unfortunately, full tracing is simply too slow to use after deployment, and may even be impractical during testing. We aid post-deployment debugging by giving programmers additional information about… (More)
Prior work proposes inexpensive, tunable tracing of acyclic paths and callsite coverage to enhance post-failure memory dumps. To better understand this data, current work investigates the benefit of each piece of traced data independently, their interplay, future low-cost data to collect, and further analysis uses of the post-mortem data.
Due to resource constraints, tracing production applications often results in incomplete data. Nevertheless, developers ideally want answers to queries about the program's execution beyond data explicitly gathered. For example, a developer may ask whether a particular program statement executed during the run corresponding to a given failure report. In… (More)
Debugging is difficult and costly, especially for production failures. To aid developers, we enhance core memory dumps produced by crashing applications with lightweight, tunable tracing. We propose two complementary forms of tracing, path traces and global coverage, and demonstrate that they can provide substantial postmortem analysis benefit at low cost.… (More)
Program coverage is used across many stages of software development. While common during testing, program coverage has also found use outside the test lab, in production software. However, production software has stricter requirements on run-time overheads, and may limit possible program instrumentation. Thus, optimizing the placement of probes to gather… (More)
Debugging is difficult and costly, especially for failures that occur after deployment. In prior work, we developed a suite of instrumentation and analysis tools, collectively titled the Crash Scene Investigation toolkit (CSI). These tools aid developers by providing additional information about failing program executions using latent data in post-failure… (More)
Debugging is difficult and costly. Developers greatly value full traces and complete, reproducible crash recordings, but these are impractical for deployed software. Fortunately, failing applications can leave behind a snapshot of their crashing state in the form of a core dump. Unfortunately, crash data alone often leaves substantial ambiguity in the… (More)