linux kernel debug in qemu with gdb

Hi
     i am a newbie, i just want debug linux kernel(x86_64), and i make
configure with x86_64_deconfig, then configure with debuginfo by make
menuconfig.
 this is my step below:
1.qemu-system-x86_64 -s -S -kernel ../staging/arch/x86_64/boot/bzImage -m 1024
2.gdb --tui vmlinux(in staging)
3.target remote localhost:1234
4.b start_kernel
5.c
but, when i input this 'c' , the system will run until kernel panic,
not stop in start_kernel, could you please give me some idea?

Thanks.
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