Re: [Xen-users] xen-tools: does not unmount disks and mounts proc into the new VM - why?

[Mike Lovell <mike@xxxxxxxxxxxx>]

Alexander Menk wrote:
> Hi!
>
> I am using xen-tools version: 3.9-4 to create domUs:
>
> 1. time xen-create-image --verbose --dist=lenny
> --install-source=/mnt/xen-file-images/lenny-64-template-debootstrap-30Jun09-fix2.tar
>  --hostname dummy --ip xxx.xxx.xxx.xxx --force
>
> 2. xm create dummy.cfg
>
> Then I get the message 
>
> Device /dev/vg0/dummy-disk is mounted in the privileged domain,
> and so cannot be mounted by a guest.
>
> 3. When I tried to umount, I got "device busy".
>
> 4. I am really surprised about the output of mount on my dom0:
>
>
> dom0:~# mount
> /dev/sda1 on / type ext3 (rw,errors=remount-ro)
> tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
> proc on /proc type proc (rw,noexec,nosuid,nodev)
> sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
> procbususb on /proc/bus/usb type usbfs (rw)
> udev on /dev type tmpfs (rw,mode=0755)
> tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
> devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=620)
> /dev/mapper/vg0-linux--images on /mnt/linux-images type xfs (rw)
> /dev/mapper/vg0-xen--file--images on /mnt/xen-file-images type xfs (rw)
> /dev/mapper/vg0-dummy--disk on /tmp/1UNYuVP7WO type ext3 (rw)
> /proc on /tmp/1UNYuVP7WO/proc type none (rw,bind)
>
>
> Why is /proc mounted to /tmp/1U.... that is in fact the disk of the new
> VM? That looks really dangerous. 
>
> Did anybody see this before?
>
> I used --force because on the first call I did a mistake and the logical
> volumes already existed. Maybe --force is not a good idea?
I would check to see if a process, like sshd, got started in the chroot 
that xen-tools created. Having something running there could keep the 
host from being able to unmount the volumes. I ran into this problem and 
it was something starting in the chroot. Hope that helps.
mike

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