[solved] Unknown boot messages: What does that mean?

[samoht]

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# 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

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4.14.9-towo.2-siduction-amd64

[melmarker]

that means that ipv6 in the the current kernel is a little bit messed up for unknown reasons - starting with something like

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linux /vmlinuz root=LABEL=lxqt iommu=soft ipv6.disable=1

might be helpful until there is a clean solution

Edit: the iommu=soft is only needed by my AMD bulldozer system i suspect