Hi Dan,
first of all thanks for looking into this long lasting, irritating
issue.
I have tried your kernel (4.13.0-30-generic #33+hf1711407v20180118b2-Ubuntu
SMP) on Ubuntu 17.10 and was able to get "unregister_netdevice: waiting for lo
to become free. Usage count = 1" in less than 5 minutes
his information might be relevant.
We are able to reproduce the problem with unregister_netdevice: waiting
for lo to become free. Usage count = 1 with 4.14.0-rc3 kernel with
CONFIG_PREEMPT_NONE=y and running only on one CPU with following boot
kernel options:
BOOT_IMAGE=/boot/vmlinuz-4.14.0-rc3
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