Kernel 6.18.18 broke virt-manager

[sdz]

After upgrading to linux-6.18.18-gentoo from linux-6.12.41-gentoo, I can no longer start my virt-manager VM. All packages on my system are updated. I can use virt-manager, if I remove the vNIC. I included the USE flags for virt-manager and iptables. I booted the 6.12.41 kernel and virt-manager works as expected.

I have no experience using iptables. I just want to get virt-manager working.

Q1. What changed between 6.12.41 and 6.18.18, which might affect this?
Q2. What should I try to get the network working in virt-manager?

Code: Select all

Error starting domain: Requested operation is not valid: network 'default' is not active

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/asyncjob.py", line 101, in tmpcb
    callback(*args, **kwargs)
    ~~~~~~~~^^^^^^^^^^^^^^^^^
  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 1446, in startup
    self._backend.create()
    ~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/lib/python3.13/site-packages/libvirt.py", line 1395, in create
    raise libvirtError('virDomainCreate() failed')
libvirt.libvirtError: Requested operation is not valid: network 'default' is not active

Code: Select all

localhost ~ # virsh net-start default
error: Failed to start network default
error: internal error: Failed to run firewall command iptables -w --table filter --list-rules: modprobe: FATAL: Module ip_tables not found in directory /lib/modules/6.18.18-gentoo
iptables v1.8.11 (legacy): can't initialize iptables table `filter': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.

localhost ~ # emerge -pv iptables virt-manager

These are the packages that would be merged, in reverse order:

Calculating dependencies           ... done!   
Dependency resolution took 1.80 s (backtrack: 0/20).

[ebuild   R    ] app-emulation/virt-manager-5.1.0-r1::gentoo  USE="gui policykit -sasl -verify-sig" PYTHON_SINGLE_TARGET="python3_13 -python3_11 -python3_12" 0 KiB
[ebuild   R    ] net-firewall/iptables-1.8.11-r1:0/1.8.3::gentoo  USE="-conntrack -netlink -nftables -pcap -static-libs -test" 0 KiB

Total: 2 packages (2 reinstalls), Size of downloads: 0 KiB

[pietinger]

Have a look into https://forums.gentoo.org/viewtopic-t-1176990.html