Created attachment 828223 [details]
Kernel log

On a laptop (Dell Precision 5520) the 1GB NIC is contained in the docking
station which is connected via USB-C.
With kernel 4.12.14-lp151.28.36-default this device gets 'lost' at random
times.
1. The kernel shows no obvious signs of the device getting lost. The lines
like:
    usb 3-1.4: reset high-speed USB device number 6 using xhci_hcd
   don't seem to occur when the device gets lost.
2. The network device is no longer disappears from the lsusb output.
3. In the more annoying cases, the network device 'hangs': and 'ip addr'
   hangs in a 'sendto' to a netlink socket.
   In other cases, the device disappears from the 'ip addr' output, unplugging
   and plugging the docking station causes the devices to re-enumerated.
   NOTE: in the attached log, the re-docking happens after the 202556.480017
   timestamp.
The issue seems to start once the machine has been suspended and/or redocked
after a boot.
The issue did not occur on a Leap 42.3 kernel.