It is a bug somewhere, but not easy to determine where.
Ok. It's annoying, but apparently it does no harm. It's my impression it comes (came) up when i hotplugged and unplugged usb devices. I used the mount tool to mount them, but i simply pulled them out without unmounting them (exception made for xfe or commandline) there is no way to do that in TCL. Or am i wrong?
The mount tool adds always a new letter for the next plug-in, even if it's the same device (sdb, sdc, sde sdf ....) - as long as i do not reboot. On the next reboot i have a long list of loops (but without the udevadm statement) in the console. That was really hurting, so i tried to shutdown without backup. And then came up that msg above.
In dmesg at a first glance there is nothing related.