Subject: libvirtd: could not find a usable firewall backend

From: Simen Endsjø <[email-masked]>
Date: Tue, 04 Mar 2025 13:51:46 +0100

After an upgrade, I can no longer start libvirtd.

  guix c991c49
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: c991c49f09d6fd2764e1f7bdae54c097c748524f

Mar  4 13:15:58 localhost shepherd[1]: Respawning libvirtd.
Mar  4 13:15:58 localhost shepherd[1]: Starting service libvirtd...
Mar  4 13:15:58 localhost shepherd[1]: Service libvirtd has been started.
Mar  4 13:15:58 localhost shepherd[1]: Service libvirtd started.
Mar  4 13:15:58 localhost shepherd[1]: Service libvirtd running with value #<<process> id: 23337 command: ("/gnu/store/bg0p3sjnl17i1zz14cnc82p4mvzc8n1s-libvirt-10.10.0/sbin/libvirtd" "-f" "/gnu/store/wx2j24bba8bzga5b90xks09fghxxqjk0-libvirtd.conf")>.
Mar  4 13:15:58 localhost libvirtd: 23349: info : libvirt version: 10.10.0
Mar  4 13:15:58 localhost libvirtd: 23349: info : hostname: REDACTED
Mar  4 13:15:58 localhost libvirtd: 23349: error : virNetworkLoadDriverConfig:155 : internal error: could not find a usable firewall backend
Mar  4 13:15:58 localhost libvirtd: 23349: error : virStateInitialize:672 : Initialization of bridge state driver failed: internal error: could not find a usable firewall backend
Mar  4 13:15:58 localhost libvirtd: 23349: error : daemonRunStateInit:617 : Driver state initialization failed
Mar  4 13:15:58 localhost shepherd[1]: Service libvirtd has been disabled.
Mar  4 13:15:58 localhost shepherd[1]:   (Respawning too fast.)