No flag days
recently. The "Following -current" FAQ lists each and every architectural change, and what to do about it, if you are updating from source..
Roundcat, you may have stated your older kernel was from Jan 1, but the dmesg you posted was built November 18.
There have been three changes in the Following -current FAQ since then, but none of those three look flag day-like to me.
Flag days require some sort of bootstrap build when updating from source rather than from binaries.
Even so, J65's recommendation -- installing from binary snapshot -- is a good one, as we don't know how many architectural changes you've missed since you first moved to -current.