[Pkg-libvirt-maintainers] Bug#565767: Bug#565767: libvirt-bin: VM doesn't work after upgrade: qemu: Could not initialize device 'tap'

[Guido Günther]

On Mon, Jan 18, 2010 at 07:00:46PM +0100, Tino Keitel wrote:
> Package: libvirt-bin
> Version: 0.7.5-4
> Severity: normal
> 
> My VMs with tap device network emulation don't work after upgrading from
> 0.7.2 in squeeze to the sid version. I get a requester with this message:
> 
> Error starting domain: internal error unable to start guest: warning: could
> not configure /dev/net/tun: no virtual network emulation
> qemu: Could not initialize device 'tap'
> 
> Traceback (most recent call last):
>   File "/usr/share/virt-manager/virtManager/engine.py", line 588, in
> run_domain
>     vm.startup()
>   File "/usr/share/virt-manager/virtManager/domain.py", line 150, in startup
>     self._backend.create()
>   File "/usr/lib/python2.5/site-packages/libvirt.py", line 293, in create
>     if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
> libvirtError: internal error unable to start guest: warning: could not
> configure /dev/net/tun: no virtual network emulation

> qemu: Could not initialize device 'tap'
Is /dev/net/tun there? What does libvirtd's output say? Please run
libvirtd in debug mode.
Cheers,
 -- Guido