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Some threads do not exit and are still running when trying to exit SITL running under Windows in Cygwin. This problem was introduced with: - posix shell #10173 because of strating a child process for the startup script and mixing up the signal handling (only Ctrl+C broken) - lockstep #10648 because of simulator threads not stopping gracefully anymore with timing race conditions (no graceful exit possible anymore) I leave the SIGINT handler on its default implementation for Cygwin which kills the process and all its threads when pressing Ctrl+C. This hotfix at least allows the usage of Ctrl+C again instead of forcing the user to use the task manager to shut down px4.exe going crazy on CPU load instead of exiting everytime.