udev fails to initialize /dev/mapper and /dev/mapper/control which denies one access to all device mapping under udev.
Steps to Reproduce:
1. emerge udev device-mapper
2. modprobe dm-mod
3. ls -laR /dev/mapper
4. mkdir /dev/mapper
5. repeat steps 1-3
File not found. After creating /dev/mapper still nothing is found inside of it.
/dev/mapper and /dev/mapper/control are created when dm-mod is loaded into the
Found the issue. One needs to set RC_DEVICE_TARBALL="no" in /etc/conf.d/rc as described in the Gentoo UDEV guide. Sorry about the false bug report, hope this might inform others having the same issue.