[SOLVED] gdb-multiarch lx-symbols failed

Issue

I am trying to debug an aarch64 Linux kernel loaded in QEMU from x86 host. When 'lx-symbols' command executed for loading the symbols from gdb, it has shown

Undefined command: "lx-symbols"

The I have tried executing 'add-auto-load-safe-path' command as shown below

gdb-multiarch  /mykernelbuild/linux/arch/arm64/boot/Image

gdb) target remote localhost:9000
Remote debugging using localhost:9000
warning: No executable has been specified and target does not support
determining executable automatically.  Try using the "file" command.

add-auto-load-safe-path /mykernelbuild/linux/scripts/gdb

Still 'lx-symbols' is returning error. I have tried adding this to '~/.gdbint' and restarting 'gdb-multiarch' as well. I have tried adding the filename also to the path

add-auto-load-safe-path /mykernelbuild/linux/scripts/gdb/vmlinux-gdb.py

still no success, any hint is greatly appreciated...

Solution

gdb-multiarch /mykernelbuild/linux/arch/arm64/boot/Image

You are debugging Image, and not vmlinux. So GDB will attempt to auto-load Image-gdb.py (which is nowhere to be found).

I have no idea what boot/Image is, but you probably want to be debugging boot/vmlinux instead.

Update:

add-auto-load-safe-path /mykernelbuild/linux/scripts/gdb

Now GDB is complaining about the /mykernelbuild/linux/scripts/gdb not being in the auto-load-safe-path (which it wouldn't be since you haven't added it yet).

You want something like:

gdb-multiarch -ex 'add-auto-load-safe-path /mykernelbuild/linux/scripts/gdb' \
  /mykernel/linux/vmlinux

Answered By - Employed Russian

Answer Checked By - Candace Johnson (WPSolving Volunteer)