kgdb内核调试

为什么我输入break start_kernel； 然后再输入c 的时候
运行到：
443.900364] TCP bic registered
[ 443.942460] NET: Registered protocol family 1
[ 443.986306] NET: Registered protocol family 17
[ 444.054663] NET: Registered protocol family 8
[ 444.075030] NET: Registered protocol family 20
[ 444.115968] Using IPI Shortcut mode
[ 444.179763] input: AT Translated Set 2 keyboard as /class/input/input0
[ 444.287310] input: ImPS/2 Generic Wheel Mouse as /class/input/input1
[ 444.355418] md: Autodetecting RAID arrays.
[ 444.397300] md: autorun ...
[ 444.441459] md: ... autorun DONE.
[ 444.523157] RAMDISK: Compressed image found at block 0
[ 444.747449] VFS: Mounted root (ext2 filesystem).
[ 444.938339] kjournald starting. Commit interval 5 seconds
[ 444.978033] EXT3-fs: mounted filesystem with ordered data mode.
[ 445.107416] Freeing unused kernel memory: 260k freed
[ 445.249608] Warning: unable to open an initial console.
[ 485.147840] atkbd.c: Spurious ACK on isa0060/serio0. Some program, like XFree86, might be trying access hardware directly.
[ 485.194634] atkbd.c: Spurious ACK on isa0060/serio0. Some program, like XFree86, might be trying access hardware directly.

就停止了呢？
而另外的target虚拟机就显示到了叫你输入用户和密码呢？