GDB: lx-symbols undefined command

Question

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

Answer 1

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.

Answer 2

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