This problem appeared on my Gentoo after I upgraded udev (to version 182) and enabled DEVTMPFS in kernel (3.2.11) because this udev has started to require it. Since this change I get these three messages in kernel log each 52 seconds. The block device is USB memory card reader (0bda:0158 Realtek Semiconductor Corp. USB 2.0 multicard reader) without a medium.
This problem appeared on my Gentoo after I upgraded udev (to version 182) and enabled DEVTMPFS in kernel (3.2.11) because this udev has started to require it. Since this change I get these three messages in kernel log each 52 seconds. The block device is USB memory card reader (0bda:0158 Realtek Semiconductor Corp. USB 2.0 multicard reader) without a medium.