kernel: in6_delayed_cksum: delayed m_pullup

[Dries Michiels]

Dear mailing list,

After upgrading my FreeBSD server from source from:
FreeBSD 11.1-STABLE (VADOS) #9 r331859: Sun Apr  1 12:09:18 CEST 2018 
to
FreeBSD 11.2-PRERELEASE (VADOS) #10 r333091: Sun Apr 29 16:48:44 CEST 2018

My /var/log/messages is getting spammed by the following notice/error:
Apr 29 19:51:42 vados kernel: in6_delayed_cksum: delayed m_pullup, m->len: 48 plen 68 off 56 csum_flags=400<CSUM_IP6_TCP>
Apr 29 19:55:34 vados last message repeated 11 times
Apr 29 20:11:56 vados last message repeated 10 times
Apr 29 20:12:42 vados last message repeated 4 times

Does anyone have a clue what this indicates?
I did not have this message on my older system (r331859).

Thanks in advance,
Dries