Hi all, After resolving lots of unresolved symbol i finally load the very simple sculldevice driver but when i perform cp /dev/zero /dev/scull0 my system is getting hang! the same with if anybody has compiled the faulty module from Rubini's book when i give operation like ls -l > /dev/fault system is hanged again if anybody have any tips thanks __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free web site building tool. Try it! http://webhosting.yahoo.com/ps/sb/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/