Ok, here is a new debug kernel:
http://people.canonical.com/~ddstreet/lp1711407/linux-image-4.13.13-00940-gf16e2bbbddee_4.13.13-00940-gf16e2bbbddee-24_amd64.deb

I didn't use the PPA as this one will dump out quite a lot of debug in
the logs all the time.  When you reproduce it (which hopefully you can
still do, even with the added debug msgs), please check the output to
find the address of the leaked dst, e.g.:

[ 2833.421135]  (netns ffff9f4d77278000): dst ffff9f4d743e9a00 expires 0
error 0 obsolete 2 flags 0 refcnt 1 ops ipv4_dst_ops+0x0/0xc0 creator
ip_route_input_rcu+0x6b0/0xd80

would be dst address "ffff9f4d743e9a00".  Then, please grep dmesg for
that, so you get output similar to:

$ dmesg | grep ffff9f4d743e9a00
[ 2823.048309] dst_init: dst ffff9f4d743e9a00 refcnt 1 from 
__dst_alloc+0x7e/0x100
[ 2823.048312] dst_hold: dst ffff9f4d743e9a00 refcnt 2 from 
rt_cache_route+0x54/0xe0
[ 2823.048327] dst_hold_safe: dst ffff9f4d743e9a00 refcnt 3 from 
inet_sk_rx_dst_set+0x7f/0xc0
[ 2823.048453] dst_release: dst ffff9f4d743e9a00 refcnt 2 from 
skb_release_head_state+0x96/0xa0
[ 2823.048572] dst_hold_safe: dst ffff9f4d743e9a00 refcnt 3 from 
tcp_add_backlog+0x12f/0x170
[ 2823.048580] dst_release: dst ffff9f4d743e9a00 refcnt 2 from 
skb_release_head_state+0x96/0xa0
[ 2823.231547] dst_release_immediate: dst ffff9f4d743e9a00 refcnt 1 from 
free_fib_info_rcu+0x173/0x1c0
[ 2833.421088]  (netns ffff9f4d77278000): open sk ffff9f4d766aa100 family 2 
state 4 dst_cache           (null) rx_dst ffff9f4d743e9a00 creator 
generic_ip_connect+0x24b/0x4f0 [cifs]
[ 2833.421135]  (netns ffff9f4d77278000): dst ffff9f4d743e9a00 expires 0 error 
0 obsolete 2 flags 0 refcnt 1 ops ipv4_dst_ops+0x0/0xc0 creator 
ip_route_input_rcu+0x6b0/0xd80


Paste that output here, so I can see the history of the dst refcnt.  If you 
don't see the initial dst_init in the trace, try using /var/log/kern.log 
instead of dmesg, as dmesg may have rolled over the older logs if you have a 
lot of output going on.

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Title:
  unregister_netdevice: waiting for lo to become free

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