Error saving memory to disk
Description of problem:
When trying to save the state of the machine using virt-manager (3.2.0) it fails with this error:

Error saving domain: operation failed: domain save job: unexpectedly failed
```bash
Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 65, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/vmmenu.py", line 182, in cb
    vm.save(meter=asyncjob.get_meter())
  File "/usr/share/virt-manager/virtManager/object/libvirtobject.py", line 57, in newfn
    ret = fn(self, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/object/domain.py", line 1377, in save
    self._backend.managedSave(0)
  File "/usr/lib/python3.9/site-packages/libvirt.py", line 1780, in managedSave
    raise libvirtError('virDomainManagedSave() failed')
libvirt.libvirtError: operation failed: domain save job: unexpectedly failed
```
Steps to reproduce:
1. setup a virtual machine
2. setup a linux distro
3. try to save the memory to disk
Additional information:
Will be provided when needed