Comment # 5 on bug 905900 from Martin Pluskal

(In reply to Takashi Iwai from comment #3)
> The message itself doesn't give any direct relation with the problem itself.
> It's a generic message showing that there is a pending deferred work.
> 
> Could you check with kernel-debug flavor to get more debug prints?

# uname -r
4.0.0-rc6-2.g9064edc-debug

# modprobe usbnet msg_level=8
# modprobe cdc_ether
# wicked ifreload enp0s29f0u2
# dmesg
...
[  189.855307] cdc_ether 3-2:1.0 usb0: register 'cdc_ether' at
usb-0000:00:1d.0-2, CDC Ethernet Device, e6:1f:13:5d:2f:cb
[  189.855364] usbcore: registered new interface driver cdc_ether
[  189.856568] cdc_ether 3-2:1.0 enp0s29f0u2: renamed from usb0
[  217.323601] cdc_ether 3-2:1.0 enp0s29f0u2: open: enable queueing (rx 4, tx
4) mtu 1500 simple framing
[  217.323670] cdc_ether 3-2:1.0 enp0s29f0u2: kevent 12 may have been dropped
[  217.371989] cdc_ether 3-2:1.0 enp0s29f0u2: link speeds: 9728 kbps up, 9728
kbps down