Hi Richard,

On Fri, Apr 29, 2011 at 5:47 PM, richard -rw- weinberger
<richard.weinber...@gmail.com> wrote:
> Anyway, what is the exact command-line which causes UML to hang?
> Can you provide me a stand alone test case?
>

Here it is:

  * download the 64-bit kernel:
http://uml.devloop.org.uk/kernels/kernel64-2.6.35.7.bz2

  * download the 64-bit filesystem
http://fs.devloop.org.uk/filesystems/Debian-Squeeze/Debian-Squeeze-AMD64-root_fs.bz2

  * Run (this works regularly):

      ./kernel64-2.6.35.7 umid=my mem=256M \
            ubd0=Debian-Squeeze-AMD64-root_fs root=/dev/ubda \
            con=fd:0,fd:1

  * Now redirect stdin from /dev/null; the UML hangs and cannot be
    shutdown even from uml_mconsole (I have to manually kill the processes):

      ./kernel64-2.6.35.7 umid=my mem=256M \
            ubd0=Debian-Squeeze-AMD64-root_fs root=/dev/ubda \
            con=fd:0,fd:1 </dev/null


> Do you really need a full blown disk image with a inittab?
> I would use hostfs.
> E.g:
> ./linux rootfstype=hostfs init=/path/to/work/doit.sh con=null
> con0=fd:0,fd:1 &> uml.log < /dev/null

Well, the idea is that users get a "reference disk image", which they
can run on their desktop to do development; when they are done with
the coding and it runs on the reference machine, they can submit to
the Grid.  I guess we could do that with hostfs as well, but then we
risk running into more permission problems than by distributing
"opaque" disk images that users can boot like a regular VM.

Thanks,
Riccardo

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