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We propose an approach that combines symbolic execution and run-time type inference from a sample program run to generate test cases, and we apply our approach to signed/unsigned conversion errors in programs. A signed/unsigned conversion error occurs when a program makes control flow decisions about a value based on treating it as a signed integer, but then later converts the value to an unsigned integer in a way that breaks the program's implicit assumptions. Our tool follows the approach of Larson and Austin in using an example input to pick a program path for analysis, and we use symbolic execution to attempt synthesis of a program input exhibiting an error. We describe a proof of concept implementation that uses the Valgrind binary analysis framework and the STP decision procedure, and we report on preliminary experiences. Our implementation is available at http://www.sf.net/projects/catchconv.

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