here is detailed udev trace output

May 17 17:53:23 mlcx500 udevd[22093]: seq 2676 queued, 'remove' 'usb'
May 17 17:53:23 mlcx500 udevd[22093]: passed 228 bytes to netlink monitor 0x7f297001c2d0
May 17 17:53:23 mlcx500 udevd[22810]: seq 2676 running
May 17 17:53:23 mlcx500 udevd[22810]: device 0x7f2970037130 filled with db file data
May 17 17:53:23 mlcx500 udevd[22810]: device node '/dev/usb/lp0' not found
May 17 17:53:23 mlcx500 udevd[22810]: removing device node '/dev/usb/lp0'
May 17 17:53:23 mlcx500 udevd[22810]: passed -1 bytes to netlink monitor 0x7f2970030fc0
May 17 17:53:23 mlcx500 udevd[22810]: seq 2676 processed with 0
May 17 17:53:23 mlcx500 udevd[22093]: seq 2676 done with 0
May 17 17:53:23 mlcx500 kernel: [29429.072893] usblp0: removed
May 17 17:53:31 mlcx500 udevd[22093]: seq 2677 queued, 'add' 'usb'
May 17 17:53:31 mlcx500 udevd[22093]: passed 225 bytes to netlink monitor 0x7f297001c2d0
May 17 17:53:31 mlcx500 udevd[22810]: seq 2677 running
May 17 17:53:31 mlcx500 udevd[22810]: device 0x7f2970030c10 has devpath '/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/usb/lp0'
May 17 17:53:31 mlcx500 udevd[22810]: no db file to read /run/udev/data/c180:0: No such file or directory
May 17 17:53:31 mlcx500 udevd[22810]: device 0x7f29700342a0 has devpath '/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0'
May 17 17:53:31 mlcx500 udevd[22810]: device 0x7f2970035b70 has devpath '/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2'
May 17 17:53:31 mlcx500 udevd[22810]: device 0x7f29700310e0 has devpath '/devices/pci0000:00/0000:00:1d.0/usb2/2-1'
May 17 17:53:31 mlcx500 udevd[22810]: device 0x7f2970031640 has devpath '/devices/pci0000:00/0000:00:1d.0/usb2'
May 17 17:53:31 mlcx500 udevd[22810]: device 0x7f2970031f80 has devpath '/devices/pci0000:00/0000:00:1d.0'
May 17 17:53:31 mlcx500 udevd[22810]: device 0x7f29700324c0 has devpath '/devices/pci0000:00'
May 17 17:53:31 mlcx500 udevd[22810]: GROUP 7 /lib/udev/rules.d/50-udev-default.rules:62
May 17 17:53:31 mlcx500 udevd[22810]: RUN 'udev-configure-printer add %p' /lib/udev/rules.d/70-printers.rules:4
May 17 17:53:31 mlcx500 udevd[22810]: no node name set, will use kernel supplied name 'usb/lp0'
May 17 17:53:31 mlcx500 udevd[22810]: creating device node '/dev/usb/lp0', devnum=180:0, mode=0660, uid=0, gid=7
May 17 17:53:31 mlcx500 udevd[22810]: preserve file '/dev/usb/lp0', because it has correct dev_t
May 17 17:53:31 mlcx500 udevd[22810]: set permissions /dev/usb/lp0, 020660, uid=0, gid=7
May 17 17:53:31 mlcx500 udevd[22810]: creating symlink '/dev/char/180:0' to '../usb/lp0'
May 17 17:53:31 mlcx500 udevd[22810]: created db file '/run/udev/data/c180:0' for '/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/usb/lp0'
May 17 17:53:31 mlcx500 udevd[25478]: starting 'udev-configure-printer add /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/usb/lp0'
May 17 17:53:31 mlcx500 kernel: [29437.148560] usblp0: USB Bidirectional printer dev 5 if 0 alt 0 proto 2 vid 0x0A5F pid 0x0027
May 17 17:53:31 mlcx500 udev-configure-printer: add /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/usb/lp0
May 17 17:53:31 mlcx500 udevd[22810]: 'udev-configure-printer add /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/usb/lp0' [25478] exit with return code 0
May 17 17:53:31 mlcx500 udevd[22810]: passed -1 bytes to netlink monitor 0x7f2970030fc0
May 17 17:53:31 mlcx500 udevd[22810]: seq 2677 processed with 0
May 17 17:53:31 mlcx500 udev-configure-printer: device devpath is /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2
May 17 17:53:31 mlcx500 udev-configure-printer: Device already handled
May 17 17:53:31 mlcx500 udevd[22093]: seq 2677 done with 0
(END)