sys-cluster/knem-0.9.7 installs /etc/udev/rules.d/45-knem.rules which udev doesn't like : udevd[2282]: NAME="%k" is ignored, because it breaks kernel supplied names, please remove it from /etc/udev/rules.d/45-knem.rules:1 This is with udev-182-r2 as well as earlier releases. Thanks for looking into it, Helmut.
Fixed in CVS