On Fri, 2002-06-07 at 08:04, Rahul Ravindran wrote: > I`m modifying a network device driver by adding encrytion and decrytion within it. The NIC is an interrupt driver one which generates an interrupt on arrival of a packet. I find that sometimes, the following error occurs : > Kernel Panic : Killing interrupt handler > In interrupt handler: loosing sync > > The system hangs after this. > > I`m an disabling interrupts at the beginning of the interrupt handler (by using spin_lock_store) and reanbling them at the end (by using spin_unlock_restore). I interrupt handler is currently takes a little time executing the decrytion code. Hence, tried putting the decrytion code after re-enabling interrupts. This has not helped. I`m not generating any interrupts within my interrupt handler. Am using GFP_ATOMIC flag for kmalloc within the handler. On searching the net, I find that these errors(killing interrupt etc) have been documented before while doing insmod but not while actually using the card. Please help. > Thanx in advance , > Rahul > Please help me on this I've seen these errors before in my own attempts to hack a network driver, normally following an Oops. The problem was eventually traced (with the help of ksymoops) to some bad pointer voodoo in my code. So my first guess would be that your encryption/decryption methods are dereferencing invalid pointers at some point. If possible, try writing a userland testbench program using your encryption/decryption routines. Then you can use gdb to help you pinpoint the problem area (and the crashes are much safer, too :-) -- Trevor Hamm -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
