I am following the guide below: https://www.kernel.org/doc/Documentation/gdb-kernel-debugging.txt
When I try to load the module symbols using the command below: (gdb) lx-symbols
gdb says that the command is undefined. How do I add these helper command to gdb?
gdb info: gdb-7.6.1-51.el7.x86-64 on Centos 7.0
You have to get the latest kernel sources (may be 4.0-rc4) or backport the patch. Basically see if you have script/gdb/ directory like this in your kernel sources. Because that is where you get these scripts.
Then you follow the steps mentioned in https://www.kernel.org/doc/Documentation/dev-tools/gdb-kernel-debugging.rst
add-auto-load-safe-path
Usage:
gdb -ex add-auto-load-safe-path /path/to/linux/kernel/source/root
Now the GDB scripts are automatically loaded, and lx-symbols is available.
Here is a minimal fully automated Buildroot + QEMU example with detailed instructions.
来源：https://stackoverflow.com/questions/29104491/gdb-lx-symbols-undefined-command