Kernel Debugging using Qemu

Hi, If anyone uses Qemu can someone please show me how to get started ? I tried : sudo qemu-system-x86_64 -s -S -kernel arch/x86/boot/bzImage -initrd /boot/initrd.img-4.1.2-vtaqemu+ /dev/zero And it does allow me to access through gdb using target remote localhost:1234 but when I set a breakpoint in kernel_start and continue it hangs and tells me /bin/sh: can't access tty; job control turned off ? I am runing a Debian 4.1.2 custom kernel. I have enabled Intel virtulization in the bios. And menuconfig have setup virtualization. After many tries have finally managed to get this far but now I can use all the help I can get. And and all suggestions, guidance, *pointers are most welcome. Thanks - Aruna