Ok Here is my steps

1. I had installed 2 ubuntu 9.04 on VM's and Also i compiled linux 2.6.31 on one of them

2. I added the this line in Ubuntu with linux 2.6.31 vmx file

debugStub.listen.guest32 = "TRUE"
debugStub.listen.guest32.remote = "TRUE"
monitor.debugOnStartGuest32 = "TRUE"
debugStub.hideBreakpoints= "TRUE"

Now i am confused that this text : (gdb) file vmlinux-2.4.21-27.EL.debug in this article : http://stackframe.blogspot.com/2007/04/debugging-linux-kernels-with.html

Where can i find this vmlinux-...-debug file? And then copy the vmlinux-...-debug file to the debugger vm machine ?

I copied the vmlinux file to my host (windows xp).

Here is my steps

1. file c:/vmlinux

reading symbols from c:/vmlinux .... done

2.target remote localhost:8832

New thread 1

0x000ffff0 in ?? ()

3. Then i set the break points

break fs/namei.c:20

Breakpoint 1 at 0x01ebd4c : file fs/namei.c, line 10

continue

Continuing

Breakpoint 1, getname (filename = 0 xc081d06e "/dev") at fs/namei.c:125

125 fs/namei.c : No such file or directory

in fs/namei.c

so is it going correct or wrong ? I quess gdb just load the symbol tables from the vmlinux which is located in xp and cannot access the original vmlinux in Linux vm. is it true

I am using the gdb on windows on my host cause of i can't connect my 2 vms. But i think it is not work correct.

I compiled linux-2.6.31 on both of this machines. But i don't know how to connect one virtual machine to other via gdb. How u ever been connect 2 VM machines ?