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

[éç <aware.why@xxxxxxxxx>]

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

Centos-domU: 

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 172.16.1.122

(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 10.18.135.250:9999

Remote debugging using 10.18.135.250:9999

[Switching to Remote target]

0xffffffffa013c5e6 in ?? ()

(gdb) b start_kernel 

Breakpoint 1 at 0xffffffff81c1fb52: file init/main.c, line 564.

(gdb) c

Continuing.

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 172.16.1.122

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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