# dmesg | grep using
...
....BUG: using smp_processor_id() in preemptible [00000000] code: systemd-network/644
... BUG: using smp_processor_id() in preemptible [00000000] code: avahi-daemon/663
... BUG: using smp_processor_id() in preemptible [00000000] code: afpd/779
... BUG: using smp_processor_id() in preemptible [00000000] code: cupsd/698
... BUG: using smp_processor_id() in preemptible [00000000] code: systemd-network/644
... BUG: using smp_processor_id() in preemptible [00000000] code: systemd-resolve/802
...
Appearing on boot screen before root prompt.
Update:
... no longer with kernel 4.14.9-towo.2-siduction-amd64