Xen users - Nov 2009 - Guest debugging fails for 32bit, works for 64bit

I''ve followed the instructions in tools/debugger/gdb/README for
building and using gdbserver-xen. While playing around with debugging
a running guest or dissecting a core file, I''ve discovered that using
it with a 32-bit PV domU fails but it works fine on the same guest if
it''s booted with a 64-bit kernel. Is this a known limitation, or am I
doing something incorrectly?

-- 
But soft you, the fair Ophelia:
Ope not thy ponderous and marble jaws,
But get thee to a nunnery -- go!
		-- Mark "The Bard" Twain


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On 2009-11-24, Paul Arthur <flowerysong00@yahoo.com>
wrote:
> I''ve followed the instructions in tools/debugger/gdb/README for
> building and using gdbserver-xen. While playing around with debugging
> a running guest or dissecting a core file, I''ve discovered that
using
> it with a 32-bit PV domU fails but it works fine on the same guest if
> it''s booted with a 64-bit kernel. Is this a known limitation, or
am I
> doing something incorrectly?
Also, do you have any suggestions for doing forensics on a
failed/crashed guest?

-- 
It''s not stalking if you''re polite
    --Tokezo Hime on RPGnet


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> -----Original Message-----
> From: xen-users-bounces@lists.xensource.com
> [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Paul
> Arthur Sent: Tuesday, November 24, 2009 6:43 PM To:
> xen-users@lists.xensource.com Subject: [Xen-users] Guest debugging
> fails for 32bit, works for 64bit
> 
> I''ve followed the instructions in tools/debugger/gdb/README for
> building and using gdbserver-xen. While playing around with debugging
> a running guest or dissecting a core file, I''ve discovered that
using
> it with a 32-bit PV domU fails but it works fine on the same guest if
> it''s booted with a 64-bit kernel. Is this a known limitation, or
am I
> doing something incorrectly?
> 
I think it''s a known limitation. I remember running into it very long
ago. Anyways, gdbsx is now merged into xen. It can be used to debug any
guests. Please try it out: tools/debugger/gdbsx/README. You''d have to
build hypervisor with gdbsx support first, make gdbsx=y, and boot with
it.

Please cc me in followups as I''m not subscribed to this list.

thanks,
Mukesh

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