Hi OpenStack folks,

We are seeing the following error when creating VMs: Jun 28 19:33:29 SR-0001 libvirtd[5289]: nl_recv returned with error: No buffer space available

This problem occurs in deployments with different OS versions, for example: Ubuntu 20.04.4 LTS ii libnl-3-200:amd64 3.4.0-1 ii libvirt-daemon 6.0.0-0ubuntu8.16

Ubuntu 22.04 LTS ii libnl-3-200:amd64 3.5.0-0.1 ii libvirt-daemon 8.0.0-1ubuntu7.5

The hypervisor has around 40 native interfaces (bounds, vlans, tunneling bridges, mgmt bridges, physical NICs, etc), and plus 40 or more tap interfaces (depending on the number of VMs allocated), but we observed errors with more than 40 tap interfaces added to the host.

Is anyone else noticing this? more details about the problem [1]

Regards, Roberto

[1] - https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/2025647