Abstract
In program debugging, reproducibility of bugs is a key requirement. Unfortunately, bugs in concurrent programs are notoriously difficult to reproduce because bugs due to concurrency happen under very specific thread schedules and the likelihood of taking such corner-case schedules during regular testing is very low. We propose concurrent breakpoints, a light-weight and programmatic way to make a concurrency bug reproducible. We describe a mechanism that helps to hit a concurrent breakpoint in a concurrent execution with high probability. We have implemented concurrent breakpoints as a light-weight library for Java and C/C++ programs. We have used the implementation to deterministically reproduce several known non-deterministic bugs in real-world concurrent Java and C/C++ programs with almost 100% probability.
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