when I analyze the crash dump file(/proc/vmcore), crash utility show
 me this error message, What does it mean exactly?
 a bug or configuration error?
 grub.conf
 kernel /boot/vmlinuz-2.6.23 console=ttyS0,9600 root=/dev/sda2 ro quiet
 crashkernel=256M@16M
 
 load cmd:
 /sbin/kexec -p --command-line="root=/dev/sda2 irqpoll maxcpus=1 nousb"
 --initrd=/boot/initrd.img-2.6.23 /boot/vmlinuz-2.6.23
 crash:
 4.1.1
 box:
 Intel(R) Pentium(R) 4 CPU 3.00GHz
 4G RAM 
 At what point did it happen? 
Dave 
I insert a module which would trigger a kernel crash, in this module 
I use request_irq(irq, myinterrupt, ...)to register a irq on the nic, and in the function
myinterrupt I 
just write something at somewhere (int *p = 00202020; *p = 10), the kernel would crash
soon , but I cann't open the /proc/vmcore with crash utility after warm reboot, the
error look like:  
   --> crash: invalid kernel virtual address: 5fb001 type:	"pgd page"