Can't start or create VMs after upgrade to 25.10.1

Apps and Virtualization
1

After upgrading from 25.04.2.6 to 25.10.1 I can no longer start or create new VM’s. I get the following:

Error Name: EFAULT
Error Code: 14
Reason: [EFAULT] Failed to create file '/var/db/system/vm/nvram/11_Debian_Trixie_VARS.fd.new': No such file or directory
Error Class: CallError
Trace: Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/middlewared/plugins/vm/supervisor/supervisor.py", line 191, in start
    if self.domain.create() < 0:
       ^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/libvirt.py", line 1373, in create
    raise libvirtError('virDomainCreate() failed')
libvirt.libvirtError: Failed to create file '/var/db/system/vm/nvram/11_Debian_Trixie_VARS.fd.new': No such file or directory

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/middlewared/api/base/server/ws_handler/rpc.py", line 360, in process_method_call
    result = await method.call(app, id_, params)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/middlewared/api/base/server/method.py", line 57, in call
    result = await self.middleware.call_with_audit(self.name, self.serviceobj, methodobj, params, app,
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/middlewared/main.py", line 954, in call_with_audit
    result = await self._call(method, serviceobj, methodobj, params, app=app,
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/middlewared/main.py", line 771, in _call
    return await methodobj(*prepared_call.args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/middlewared/api/base/decorator.py", line 108, in wrapped
    result = await func(*args)
             ^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/middlewared/plugins/vm/vm_lifecycle.py", line 57, in start
    await self.middleware.run_in_thread(self._start, vm['name'])
  File "/usr/lib/python3/dist-packages/middlewared/main.py", line 668, in run_in_thread
    return await self.run_in_executor(io_thread_pool_executor, method, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/middlewared/main.py", line 665, in run_in_executor
    return await loop.run_in_executor(pool, functools.partial(method, *args, **kwargs))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/middlewared/plugins/vm/vm_supervisor.py", line 68, in _start
    self.vms[vm_name].start(vm_data=self._vm_from_name(vm_name))
  File "/usr/lib/python3/dist-packages/middlewared/plugins/vm/supervisor/supervisor.py", line 201, in start
    raise CallError('\n'.join(errors))
middlewared.service_exception.CallError: [EFAULT] Failed to create file '/var/db/system/vm/nvram/11_Debian_Trixie_VARS.fd.new': No such file or directory

If I check /var/db/system/vm does, in fact, not exist.

2

Changing the system dataset from the storage pool to the boot pool and then back seems to have cured this. It seems like some of the paths under .system were not created correctly.

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