Hello!
In case anyone wondering (like I did) if this is still an issue, it's not.
It was fixed in 4.12.
d in a new user, pid, mnt, and net namespaces,
the kernel reports a bug:
[root@fc24 net]# unshare -Urmfpn sh run.sh
[root@fc24 net]# unshare -Urmfpn sh run.sh
^C
[ 30.592295] unregister_netdevice: waiting for lo to become free. Usage count
= 1
[ 37.958180]
===
ee.
Usage count = 1
[ 97.079561] systemd-journald[180]: Sent WATCHDOG=1 notification.
[ 107.319260] unregister_netdevice: waiting for lo to become free.
Usage count = 1
[ 117.567180] unregister_netdevice: waiting for lo to become free.
Usage count = 1
[ 127.807401] unregister_netdevice: waiting f
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