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$ make menuconfig

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Kernel hacking -> Kernel debugging -> GDB/KDB -> Enable KGDB/KDB Support

Kernel hacking -> Compile-time checks and compiler options -> Compile the kernel with debug info

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$ make

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linux /boot/vmlinuz-5.4.0-74-generic root=/dev/sda1 ro debug

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$ sudo update-grub

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(gdb) target remote :1234

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(gdb) symbol-file vmlinux

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(gdb) break main

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(gdb) print my_variable

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(gdb) set var my_variable = 123

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