Hi folks, I had these 2 functions in a module (1 sysctl and the other a procfs). Both are actually achieving the same goals, the sysctl returns a pointer to a structure while the procfs prints it out to /proc/net/xx. Now, the sysctl and procfs works perfectly when I loaded it as a module. However, when I compiled the thing into the kernel, it gives me segmentation fault whenever I called sysctl or do a cat /proc/net/xx. The sysctl call did copy_to_user(...) the structure and the procfs already holds the structure in the kernel space, so all it had to do is to print it out. I did a lot of printk and notice that the structure could be NULL. But this wasn't the case when I loaded it as a module. It causes the kernel to hexdump the registers when the segmentation fault occurs. However, the kernel did not panic. Does anyone has any idea how I can debug the run time kernel? I am eternally grateful for any advices. Cheers, Jon. -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ IRC Channel: irc.openprojects.net / #kernelnewbies Web Page: http://www.kernelnewbies.org/
