Linux驱动开发杂记(0x0F) - Cannot access memory at address

按照教程Linux内核调试环境搭建(基于ubuntu12.04) 配置kgdb双机调试时，出现一下错误：

(gdb) set serial baud 115200
(gdb) target remote /dev/ttyS0
Remote debugging using /dev/ttyS0
0xffffffffb753b940 in ?? ()
(gdb) b start_kernel
Breakpoint 1 at 0xffffffff82819ad0: file init/main.c, line 515.
(gdb) c
Continuing.
Warning:
Cannot insert breakpoint 1.
Cannot access memory at address 0xffffffff82819ad0

解决方法是：在grub.cfg中添加rodata=off nokaslr

也就是在

linux /boot/vmlinuz-2.6.32.61 root=UUID=f8c18f80-7723-470b-98a852566006 ro

quiet

kgdb=ttyS0,115200 kgdboc=ttyS0,115200  kgdbwait rodata=off nokaslr