CachyOS, I had succesfully setup a win11 looking-glass a year or so earlier. I started the VM after some time, but this is what I’m getting:
failed to setup container for group 17: Failed to set group container: Invalid argument.
I booted in newly installed CachyOS partition, decided to setup vfio passthrough from the beginning. Everything setup again, IOMMU and all, vm creation moment → begin installation…
SAME DAMN ERROR.
Does anybody have any clue what piece of crap got updated in the meantime, so I can nuke it out of the system and fix this?
My setup is as follows:
Ryzen 9950x
96 GB RAM
nvidia 2060 that is being plugged into windows
nvidia 4060 Ti that is running the host display
bunch of SSD’s
Kernel: Linux 6.19.3-2-cachyos
KDE Plasma 6.6.0
EDIT: This is a kind of rudimentary rage-written post as I have to leave in a couple of minutes for an hour or two… If you need any more info, I’ll be adding it later. Thanks in advance everyone!
Edit: The full error message:
Unable to complete install: ‘internal error: QEMU unexpectedly closed the monitor (vm=‘win10’): 2026-02-25T22:44:30.349080Z qemu-system-x86_64: -device {“driver”:“vfio-pci”,“host”:“0000:03:00.0”,“id”:“hostdev0”,“bus”:“pci.4”,“addr”:“0x0”}: vfio 0000:03:00.0: failed to setup container for group 17: Failed to set group container: Invalid argument’
Traceback (most recent call last):
File “/usr/share/virt-manager/virtManager/asyncjob.py”, line 67, in cb_wrapper
callback(asyncjob, *args, **kwargs)
~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/usr/share/virt-manager/virtManager/createvm.py”, line 1969, in _do_async_install
installer.start_install(guest, meter=meter)
~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
File “/usr/share/virt-manager/virtinst/install/installer.py”, line 722, in start_install
domain = self._create_guest(guest, meter, initial_xml, final_xml, doboot, transient)
File “/usr/share/virt-manager/virtinst/install/installer.py”, line 664, in _create_guest
domain = self.conn.createXML(initial_xml or final_xml, 0)
File “/usr/lib/python3.14/site-packages/libvirt.py”, line 4599, in createXML
raise libvirtError(‘virDomainCreateXML() failed’)
libvirt.libvirtError: internal error: QEMU unexpectedly closed the monitor (vm=‘win10’): 2026-02-25T22:44:30.349080Z qemu-system-x86_64: -device {“driver”:“vfio-pci”,“host”:“0000:03:00.0”,“id”:“hostdev0”,“bus”:“pci.4”,“addr”:“0x0”}: vfio 0000:03:00.0: failed to setup container for group 17: Failed to set group container: Invalid argument