Re: [Xen-devel] gdbsx - xg_attach:Unable to pause domain:1; failed to attach to domain:1 errno:13

[Pete Delaney <pdelaney@xxxxxxxxxxxxxxx>]

Hi Mukesh:

    > Hmm... I just tried and it worked for me, so things are ok it seems on 
latest xen/linux. 
    > The errno EPERM indicates something might not be properly setup. 
    > Are you able to run other xen commands like xl list, etc?  
    > I see you are running as root, are you running gdbsx on dom0? 
 
Gdbsx runs on dom0, which I believe is the same as running on the host when 
it's booting for Xen support in the grub selection.
On the host the Xen commands are available as I showed in my initial email, I 
used the "xl list" and "xl pause" commands:

    >  root@piet-openxen:~# xl list
    >   Name                                        ID   Mem VCPUs  State   
Time(s)
    >    Domain-0                                     0 14734    12     r-----  
  8562.9
    >   New_PV_Driver                                1  1023     4     -b----   
   50.3
   >  root@piet-openxen:~#

    > root@piet-openxen-blade:~# xl pause 1


I was running as root on the host/dom0.

Wondering if the host kernel has to be configured to support gdb attaching with 
gdbsx.

Sorry about the reply exchange layout; I can' only run outlook here at work. 
I like the thunderbird reply scheme much more.

-piet

--
Pete/Piet Delaney                                               
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-----Original Message-----
From: Mukesh Rathor [mailto:mukesh.rathor@xxxxxxxxxx] 
Sent: Tuesday, August 26, 2014 3:48 PM
To: Pete Delaney
Cc: xen-devel@xxxxxxxxxxxxx; piet.delaney@xxxxxxxxx; Elaine Huang
Subject: Re: gdbsx - xg_attach:Unable to pause domain:1; failed to attach to 
domain:1 errno:13

On Tue, 26 Aug 2014 02:14:30 +0000
Pete Delaney <pdelaney@xxxxxxxxxxxxxxx> wrote:

> Hi Mukesh:
> 
> I tried your gdbsx stub but hit a couple errors.
> I didn't find an explanation with google; nor on the xen-devel mailing 
> list yet. Thought I'd ask ya.
> 
> I installed Ubuntu-14.04 Server with OpenXenManager on my Xenon 
> workstation and have A Xenon blade also with Ubunto-14.04 and OpenXen. 
> Seems to run about the same on both Machines.
> 
> This afternoon I pulled the Xen source with git from xenbits.xen.org 
> and build it.
> 
> The version of gdbsx that I built on my workstation is having problems 
> attaching to Domain-0. I tried this on the host. Do I need to create a 
> shell to a Domain-0 instance or something?

gdbsx runs on dom0 and attaches to a domU.

>     root@piet-openxen:~# ./gdbsx -c 1 64
>     ERROR:xg_attach:Unable to pause domain:1
>     ERROR: failed to attach to domain:1 errno:13 [Permission Denied]


Hmm... I just tried and it worked for me, so things are ok it seems on latest 
xen/linux. The errno EPERM indicates something might not be properly setup. Are 
you able to run other xen commands like xl list, etc?  I see you are running as 
root, are you running gdbsx on dom0? 

Mukesh


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