I'm getting this warning when the system boots. I'm using OpenRC.
I've added udev-mount to sysinit runlevel as suggested here: http://forums.gentoo.org/viewtopic-t-94 ... art-0.html
but it doesn't fix the problem.
This warning/error doesn't cause any problems on my system, at least I didn't notice any, but I want to know what's causing it.