Hello. I want to ask why NULL dereference is never valid. Why isn't it possible that an application will have some data at virtual address zero ? is it platform-specific issue or is it by-design in linux ? Thank You naziir -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/