Hi again,

so for the second kernel (), was able to reproduce it in ~same time. The
messages are:

Feb 13 23:04:23 prg41-004 kernel: [  650.285711] unregister_netdevice: waiting 
for lo (netns ffff943cfe8ce000) to become free. Usage count = 1
Feb 13 23:04:23 prg41-004 kernel: [  650.285736]        (netns 
ffff943cfe8ce000): dst ffff943d18ac4200 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

root@prg41-004:~# grep ffff943d18ac4200 /var/log/syslog
Feb 13 23:02:14 prg41-004 kernel: [  521.458077] dst_init: dst ffff943d18ac4200 
refcnt 1 from __dst_alloc+0x7e/0x100
Feb 13 23:02:14 prg41-004 kernel: [  521.458085] dst_hold: dst ffff943d18ac4200 
refcnt 2 from rt_cache_route+0x54/0xe0
Feb 13 23:02:14 prg41-004 kernel: [  521.634088] dst_hold_safe: dst 
ffff943d18ac4200 refcnt 3 from ip_route_output_key_hash_rcu+0x8a1/0xa20
Feb 13 23:02:14 prg41-004 kernel: [  521.778104] dst_release_immediate: dst 
ffff943d18ac4200 refcnt 2 from free_fib_info_rcu+0x146/0x1c0
Feb 13 23:04:23 prg41-004 kernel: [  650.285736]        (netns 
ffff943cfe8ce000): dst ffff943d18ac4200 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 23:04:33 prg41-004 kernel: [  660.525715]        (netns 
ffff943cfe8ce000): dst ffff943d18ac4200 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 23:04:43 prg41-004 kernel: [  670.669641]        (netns 
ffff943cfe8ce000): dst ffff943d18ac4200 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

etc.

I hope it helps!

Regards
Jirka H.

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

Title:
  unregister_netdevice: waiting for lo to become free

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