[libvirt-users] Starting VM fails with: "Setting different DAC user or group on /path... which is already in use" after upgrading to libvirt 5.6.0-1

[Michal Privoznik]

On 8/19/19 9:53 PM, Nir Soffer wrote:
> Hi,
> 
> I upgraded to a Fedora 29 host using virt-preview repo to
> libvirt-daemon-5.6.0-1.fc29.x86_64
> The host was using plain Fedora 29 without virt-preview before that.
> 
> After the upgrade, starting some vms that were running fine fail now with
> this error:
> 
> Error starting domain: internal error: child reported (status=125):
> Requested operation is not valid: Setting different DAC user or group on
> /home/libvirt/images/voodoo4-os.img which is already in use
> 
> Traceback (most recent call last):
>    File "/usr/share/virt-manager/virtManager/asyncjob.py", line 75, in
> cb_wrapper
>      callback(asyncjob, *args, **kwargs)
>    File "/usr/share/virt-manager/virtManager/asyncjob.py", line 111, in tmpcb
>      callback(*args, **kwargs)
>    File "/usr/share/virt-manager/virtManager/object/libvirtobject.py", line
> 66, in newfn
>      ret = fn(self, *args, **kwargs)
>    File "/usr/share/virt-manager/virtManager/object/domain.py", line 1279,
> in startup
>      self._backend.create()
>    File "/usr/lib64/python3.7/site-packages/libvirt.py", line 1089, in create
>      if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
> libvirt.libvirtError: internal error: child reported (status=125):
> Requested operation is not valid: Setting different DAC user or group on
> /home/libvirt/images/voodoo4-os.img which is already in use
> 
> These vms we created by creating one vm, and the cloning the vms.
> 
> I tried to delete the disks and add them back in one of the vms, but the vm
> still fail with the
> same error.
> 
> I hope that someone have a clue what is the issue, and how it can be fixed.

How do you clone the vms? The error message suggests that the image is 
in use - is it possible that you're trying to start two domains over the 
same disk?

Michal