Hi Dan,

so for the first kernel (linux-
image-4.13.13-00940-gf16e2bbbddee_4.13.13-00940-gf16e2bbbddee-
24_amd64.deb), it failed after some 10 minutes. The outputs are:

Feb 13 22:35:54 prg41-004 kernel: [  736.399342] unregister_netdevice: waiting 
for lo (netns ffff9adbfbebb000) to become free. Usage count = 1
Feb 13 22:35:54 prg41-004 kernel: [  736.399376]        (netns 
ffff9adbfbebb000): dst ffff9ae3fee51f00 expires 0 error 0 obsolete 2 flags 0 
refcnt 2 ops ipv4_dst_ops+0x0/0xc0 creator 
ip_route_output_key_hash_rcu+0x355/0xa20

And then:
root@prg41-004:~# grep ffff9ae3fee51f00 /var/log/syslog
Feb 13 22:33:33 prg41-004 kernel: [  595.493003] dst_init: dst ffff9ae3fee51f00 
refcnt 1 from __dst_alloc+0x7e/0x100
Feb 13 22:33:33 prg41-004 kernel: [  595.493009] dst_hold: dst ffff9ae3fee51f00 
refcnt 2 from rt_cache_route+0x54/0xe0
Feb 13 22:33:33 prg41-004 kernel: [  595.648996] dst_hold_safe: dst 
ffff9ae3fee51f00 refcnt 3 from ip_route_output_key_hash_rcu+0x8a1/0xa20
Feb 13 22:33:33 prg41-004 kernel: [  595.689067] dst_release_immediate: dst 
ffff9ae3fee51f00 refcnt 2 from free_fib_info_rcu+0x146/0x1c0
Feb 13 22:35:54 prg41-004 kernel: [  736.399376]        (netns 
ffff9adbfbebb000): dst ffff9ae3fee51f00 expires 0 error 0 obsolete 2 flags 0 
refcnt 2 ops ipv4_dst_ops+0x0/0xc0 creator 
ip_route_output_key_hash_rcu+0x355/0xa20
Feb 13 22:36:04 prg41-004 kernel: [  746.447322]        (netns 
ffff9adbfbebb000): dst ffff9ae3fee51f00 expires 0 error 0 obsolete 2 flags 0 
refcnt 2 ops ipv4_dst_ops+0x0/0xc0 creator 
ip_route_output_key_hash_rcu+0x355/0xa20
Feb 13 22:36:14 prg41-004 kernel: [  756.527237]        (netns 
ffff9adbfbebb000): dst ffff9ae3fee51f00 expires 0 error 0 obsolete 2 flags 0 
refcnt 2 ops ipv4_dst_ops+0x0/0xc0 creator 
ip_route_output_key_hash_rcu+0x355/0xa20
Feb 13 22:36:24 prg41-004 kernel: [  766.639159]        (netns 
ffff9adbfbebb000): dst ffff9ae3fee51f00 expires 0 error 0 obsolete 2 flags 0 
refcnt 2 ops ipv4_dst_ops+0x0/0xc0 creator 
ip_route_output_key_hash_rcu+0x355/0xa20
Feb 13 22:36:34 prg41-004 kernel: [  776.815056]        (netns 
ffff9adbfbebb000): dst ffff9ae3fee51f00 expires 0 error 0 obsolete 2 flags 0 
refcnt 2 ops ipv4_dst_ops+0x0/0xc0 creator 
ip_route_output_key_hash_rcu+0x355/0xa20
Feb 13 22:36:45 prg41-004 kernel: [  786.958967]        (netns 
ffff9adbfbebb000): dst ffff9ae3fee51f00 expires 0 error 0 obsolete 2 flags 0 
refcnt 2 ops ipv4_dst_ops+0x0/0xc0 creator 
ip_route_output_key_hash_rcu+0x355/0xa20
Feb 13 22:36:55 prg41-004 kernel: [  797.070875]        (netns 
ffff9adbfbebb000): dst ffff9ae3fee51f00 expires 0 error 0 obsolete 2 flags 0 
refcnt 2 ops ipv4_dst_ops+0x0/0xc0 creator 
ip_route_output_key_hash_rcu+0x355/0xa20

(and obviously more of such messages every 10 seconds)

BTW from the timing it seems that the docker image who produced this
error might be interrupted with timeout (normally, the dockers images we
run on the machine live for few seconds only).

Will post the second kernel soon.

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https://bugs.launchpad.net/bugs/1711407

Title:
  unregister_netdevice: waiting for lo to become free

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