Re: [uml-user] start a xterm on con1 fails

[Richard W. <ric...@gm...>]

On Thu, Feb 12, 2015 at 9:14 PM, Julien Iguchi-Cartigny
<jul...@un...> wrote:
> On 02/10/2015 09:27 PM, Richard Weinberger wrote:
>> On Tue, Feb 10, 2015 at 3:53 PM, Julien Iguchi-Cartigny
>> <jul...@un...> wrote:
>>> Hello,
>>>
>>> I'm maintaining Netkit-NG, a set of scripts to boot and configure small
>>> networks using UML machines for teaching purposes.
>>>
>>> <https://netkit-ng.github.io/>
>>>
>>> This set of scripts is based on Netkit
>>>
>>> <http://www.netkit.org/>
>>>
>>> which was using kernel from Debian Lenny. Starting UML with con1=xterm
>>> was working at this time. But now, using the same configuration to boot
>>> Debian Wheezy UML kernel with a xterm on con1 fails.
>>>
>>> So far I'm stuck with the following command lines.
>>>
>>> This one works (starts a xterm with UML):
>>>
>>> xterm -e /home/kartoch/works/netkit/netkit-ng/kernel/netkit-kernel
>>> modules=/home/kartoch/works/netkit/netkit-ng/kernel/modules name=dummy
>>> title=dummy umid=dummy mem=36M
>>> ubd0=/home/kartoch/tmp/tmp/dummy.disk,/home/kartoch/works/netkit/netkit-ng/fs/netkit-fs
>>> root=98:0 uml_dir=/home/kartoch/.netkit/mconsole hosthome=/home/kartoch
>>> quiet con0=fd:0,fd:1 con1=null SELINUX_INIT=0
>>>
>>> But if I want to start UML with a second xterm on the con1, i.e.
>>> replacing con1= null by con1=xterm in the commad line, no second xterm
>>> is started. This was the expected behavior in the original netkit (and
>>> it worked).
>>>
>>> I'm looking for help, especially about how to debug this problem (so far
>>> no error messages in messages or dmesg in the host or the UML machine)
>>> and how port-helper works on this case.
>>
>> Can you find the last working kernel version?
>> If we know that it worked in version X and was broken in X+1
>> we can start searching. :)
>>
>
> Hello,
>
> thank you for your feedback.
>
> At the present time I've only the "official" kernel from debian. So I've
> a working instance based on Lenny and a not-working one on Wheezy.
> testing by dichotomy every kernel between these two will require a lot
> of time. Is there any standard UML testbed to fastly evaluate it ?

You can build UML by your own. Pick a kernel and run:
make defconfig ARCH=um
make menuconfig ARCH=um
make linux ARCH=um

I tried Linus' tree today, having multiple xterms worked fine.
So, I'm not sure what the real issue is.

-- 
Thanks,
//richard