constant call trace in log.

Hi everybody,

I'm a gentooer and not much of a kernel hacker, more of a tweaker,
but I'm curious about this never-ending output in my syslog

https://paste.lugons.org/show/2679/

It's been going on for weeks, the same thing over and over. What does
it mean? And how do I stop it? I've turned off every debugging option
in menuconfig I can find. irc #gentoo has not been much help.

rgrds

Max