When running the latest DayZ experimental server with any mods, stopping the server via control c or sending the SIGTERM signal to the process, causes what looks like a double free, which then causes a deadlock in the program. I've briefly inspected a core file from this scenario and found that many threads were stuck on PTHREAD_COND_MUTEX, a clear indication of a deadlock, IMO.
When no mods are loaded, the server exits cleanly.
BUT, with certain mods loaded, and I suspect VPPAdminTools, the server seg faults upon exit. This is also not a clean exit, but at least it does exit, whereas with the previous scenario, only a SIGKILL will end the process.