I never experienced this problem. If the udevd problem occurs periodically one could restart udevd as a cron job. Instead of killing and starting udevd manually, I would use the shell script /etc/init.d/udev.
Code:
sudo /etc/init.d/udev restart
In the configuration file /etc/udev/udev.conf there is a line setting the log priority. Using the value debug instead of err could help to find an answer. The program udevadm lets you watch and control the activity of the udev daemon:
Code:
sudo udevadm monitor
Since udevadm is a very complex program it seems useful to read its man page.