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Re: [Xen-devel] help on debugging kernel module in Xen
- To: ushuanglily@xxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx
- From: "Lily Huang" <ushuanglily@xxxxxxxxx>
- Date: Fri, 12 Jan 2007 16:07:11 -0500
- Delivery-date: Fri, 12 Jan 2007 13:06:46 -0800
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Many thanks for your help!
I tried the command "target remote 127.0.0.1:9999", and got the response:
/******************************************************************************/
Remote debugging using 127.0.0.1:9999
[New Thread 0]
[Switching to Thread 0]
0xc01013a7 in hypercall_page ()
warning: shared library handler failed to enable breakpoint <------------------ this could be a problem
/******************************************************************************/
then, I did "br filp_open", and then "cont".
But no matter what file I opened in domU, the breakpoint is never encountered. It appears that the breakpoint is not activate.
I googled but cannot find answer so far.
Did you run into similar problems?
Thanks,
lily
On 1/12/07, Brendan Cully <brendan@xxxxxxxxx
> wrote:On Friday, 12 January 2007 at 15:25, Lily Huang wrote:
> Thanks, Brendan.
>
> I followed the README instruction and did follows:
>
> 1. start a domU
> 2. in Dom0, run "gdbserver-xen 127.0.0.1:9999 --attach 5", where 5 is the
> domain id of the domU
> 3. I got the response:
> /*******************************/
> Attached; pid = 5
> Listening on port 9999
> /*******************************/
> And then, I lost connection with the domU, I tried both network and console,
> neither works for me.
when the debugger attaches, it pauses the guest.
> 4. I run "gdb /boot/vmlinux-syms-2.6.16.33-xenU" in dom0, hoping to
> reactivate domU with debug command.
>
> the response is as follows:
>
> /*******************************/
> GNU gdb Red Hat Linux (6.3.0.0-1.84rh)
> Copyright 2004 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB. Type "show warranty" for details.
> This GDB was configured as "i386-redhat-linux-gnu"...Using host libthread_db
> library "/lib/libthread_db.so.1".
> /*******************************/
>
> when I typed "cont" command in the gdb, I got "The program is not being
> run."
>
> Am I doing something wrong? Any further help will be highly appreciated.
you need to attach to the domain from within gdb:
target remote localhost:9999
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