Even with mandatory code reviews, static analysis, and comprehensive test suites, bugs will still be present in software. Due to the nature of embedded operating systems, some bugs can go beyond the garden variety of security vulnerability. This talk will present the initial efforts to fuzz-test parts of the Zephyr operating system by testing parts of its networking layer. It will discuss the pitfalls of performing such test on an operating system for embedded devices, what was done to work around them, tools used, and some of the results. (Fuzz testing is a technique to create test cases automatically, often triggering memory corruption, crashes, and other adverse effects.)