hello, I'm trying to see when and how a certain variable is being modified and I wonder how to get kdb to do that for me. when I do 'insmod my_module' with my network driver, I noticed that dev->refcnt is 0 at first and gets increased to 1 after calling register_netdev. When I want to do 'rmmod my_module' somehow dev->refcnt is at 2 before the call to unregister_netdev and so the kernel (2.4.0-test9) won't let the module to unload. Since I don't increase it explicitly, I want to know who does it for me and when to see if I'm doing anything wrong. So, I modified my module to contain in the global section: static void* ptr; EXPORT_SYMBOL(ptr); and in my module_init function I added: ptr = (void*) &dev->refcnt; after running 'insmod my_module' I used ksyms and found that ptr is at address 0xd081eeb4. after entering kdb, I did: kdb> md 0xd081eeb4 0xd081eeb4 c470bedc 00000000 00000000 00000000 0xd081eec4 00000000 00000000 00000000 00000000 . . kdb> bph 0xc470bedc Forced Breakpoint at.... #0 ... kdb> be 0 kdb> go When I try to return to normal shell, the system is totally hung and won't even receive inputs from the remote serial terminal. I tried bp, bpa and bpha, but the result is always the same. Thanks, Shmulik Hen Software Engineer Linux Advanced Networking Services Network Communications Group, Israel (NCGj) Intel Corporation Ltd. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/