timecounter went backward?

[Valery Ushakov <uwe%stderr.spb.ru@localhost>]

Dusted off my Mr.Coffee and with the current'ish current (10.99.11) I
consistently get:

  timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
  WARNING: lwp 6 (system softser/0) flags 0xa0000060: timecounter went backwards from (1 + 0x6fbb9cf8d9d031d9/2^64) sec to (1 + 0x6d30ad462eedd6d3/2^64) sec in netbsd:mi_switch+0x4c

Anything to investigate/fix here?  (Though not immediately, I loaned
that mr.coffee out and my other one is in storage and will take a bit
of time to retrieve).

-uwe