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# grep -e -.interface: -e copy-iface: -e netmap: /usr/local/etc/suricata/suricata.yaml
  - interface: eth0
    #copy-iface: eth1
  - interface: default
  - interface: default
netmap:
  - interface: default
    # (e.g. "copy-iface: eth0+"). Don't forget to set up a symmetrical eth0+ -> eth0
    #copy-iface: eth3
  - interface: igb0
    copy-iface: igb0^
  - interface: igb0^
    copy-iface: igb0

# dmesg | grep generic_netmap_register

<EMPTY>


I had the same issue here, firewall (Shuttle DH270) suddenly unreachable after update to 22.7.9 after ~1 hour.
Not pingable on either interface, but could be rebooted with power button (no monitor, keyboard attached)
After reboot, everything worked normally, but froze again after ~30min

Reverted the kernel -> no success
Reverted base, opnsense and suricata -> stable for 24+ hours

Strongly suspect suricata, but there is nothing to be found in the logs