Hi, In the kernel configuration (as of 2.6.9) CONFIG_DEBUG_SPINLOCK help message, it says: "This is best used in conjunction with the NMI watchdog so that spinlock deadlocks are also debuggable." What is this NMI watchdog? How do I enable it? NMI and watchdog words don't exist in my .config. Thanks, Bahadir -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/