This started not long before 4.9-PRERELEASE dmesg reports usual text only a few seconds after reboot. Later it displays a single line with a fragment of ipfw log, e.g. 167 213.131.11.152 in via fxp0 which seems to change with each new activity of ipfw. Files /var/log/dmesg.today and /var/log/dmesg.yesterday rotate daily as usual and contain similar single line. The file /var/run/dmesg.boot still has usual text of dmesg. Thank you very much for any idea how to combat it. Sergei