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[Xen-devel] ãProblemã about using gdbsx to debug guest linux VM

I run a centos6.2 guest VM in xen4.1.2,  the id of centos-domU is 22.

The info of dom0 is:
2.6.32-131.21.1.el6.xendom0.x86_64 #1 SMP Tue Dec 13 18:09:29 EST 2011 x86_64 x86_64 x86_64 GNU/Linux

2.6.32-220.7.1.el6.x86_64 #1 SMP Wed Mar 7 00:52:02 GMT 2012 x86_64 x86_64 x86_64 GNU/Linux 

At dom0, I went like this:
[malei@xentest-4-1 Tue Apr 30 ~]$ sudo gdbsx -a 22 64 9999
Listening on port 9999
Remote debugging from host

(After that, I found the vm became paused, but next, I should run gdb on centos-domU,
so I set the vm to be unpaused by xl unpause 22)

Then, at centos-domU, I went like this:
(gdb) set verbose on
(gdb) set print pretty
(gdb) file /usr/lib/debug/lib/modules/2.6.32-220.el6.x86_64/vmlinux
Reading symbols from /usr/lib/debug/lib/modules/2.6.32-220.el6.x86_64/vmlinux...done.
(gdb) directory rpmbuild/BUILD/kernel-2.6.32-220.el6/linux-2.6.32-220.el6.x86_64/
Source directories searched: /home/malei/rpmbuild/BUILD/kernel-2.6.32-220.el6/linux-2.6.32-220.el6.x86_64:$cdir:$cwd
(gdb) directory /usr/src/debug/kernel-2.6.32-220.el6/linux-2.6.32-220.el6.x86_64/
Source directories searched: /usr/src/debug/kernel-2.6.32-220.el6/linux-2.6.32-220.el6.x86_64:/home/malei/rpmbuild/BUILD/kernel-2.6.32-220.el6/linux-2.6.32-220.el6.x86_64:$cdir:$cwd
(gdb) target remote
Remote debugging using
[Switching to Remote target]
0xffffffffa013c5e6 in ?? ()
(gdb) b start_kernel 
Breakpoint 1 at 0xffffffff81c1fb52: file init/main.c, line 564.
(gdb) c
Remote connection closed

At that time, messages echoed at dom0:
[malei@xentest-4-1 Tue Apr 30 ~]$ sudo gdbsx -a 22 64 9999
Listening on port 9999
Remote debugging from host
gdbsx: xg_main.c:497: xg_resume_n_wait: Assertion `_domain_is_paused()' failed.

Why would the Assertion failure happen?
Preciate for your reply, thanks in advance.

Best regards.
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