Using ubuntu24.4 system qemu-system-aarch64 +gdb-multiarch to debug the kernel, setting breakpoints cannot be stopped

[jie ren]

Hi, I have a question for help

    I recently  Using ubuntu24.4 system qemu-system-aarch64 +gdb-multiarch to debug the kernel, setting breakpoints cannot be stopped.

   system information:

        ubuntu version: 22.04

        Debug kernel version:  5.0.0

        qemu version: 

· qemu-system-aarch64 --version

· QEMU emulator version 8.2.2 (Debian 1:8.2.2+ds-0ubuntu1.2)

· Copyright (c) 2003-2023 Fabrice Bellard and the QEMU Project developers

gdb version:

· gdb-multiarch --version

· GNU gdb (Ubuntu 15.0.50.20240403-0ubuntu1) 15.0.50.20240403-git

· Copyright (C) 2024 Free Software Foundation, Inc.

· License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

· This is free software: you are free to change and redistribute it.

· There is NO WARRANTY, to the extent permitted by law.

Steps to reproduce:

    1. Boot the system using qemu:  

1. qemu-system-aarch64 -machine virt -cpu cortex-a57 -machine type=virt -m 1024 -smp 4 -kernel arch/arm64/boot/Image --append "noinitrd root=/dev/vda rw console=ttyAMA0 loglevel=8" -nographic -drive if=none,file=rootfs_ext4.img,id=hd0 -device virtio-blk-device,drive=hd0 --fsdev local,id=kmod_dev,path=$PWD/kmodules,security_model=none -device virtio-9p-device,fsdev=kmod_dev,mount_tag=kmod_mount -S -s

Use gdb-multiarch to connect and debug:

gdb-multiarch vmlinux

(gdb) target remote localhost:1234

Remote debugging using localhost:1234

0x0000000040000000 in ?? ()

(gdb) b start_kernel

Breakpoint 1 at 0xffff2000126704ec: file init/main.c, line 538.

(gdb) c

Continuing.