here is the output:
Feb 2 18:50:14 prg41-004 kernel: [ 482.151773] unregister_netdevice: waiting
for lo (netns ffff8de11803e000) to become free. Usage count = 1
Feb 2 18:50:14 prg41-004 kernel: [ 482.151876] (netns
ffff8de11803e000): dst ffff8dd905360300 expires 0 error 0 obsolete 2 refcnt 1
ops ipv4_dst_ops+0x0/0xc0 creator rt_dst_alloc+0x54/0xe0
It keeps to be output every 10s for over 500s now.
I hope it helps.
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unregister_netdevice: waiting for lo to become free
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This is a "continuation" of bug 1403152, as that bug has been marked
"fix released" and recent reports of failure may (or may not) be a new
bug. Any further reports of the problem should please be reported
here instead of that bug.
When shutting down and starting containers the container network
namespace may experience a dst reference counting leak which results
in this message repeated in the logs:
unregister_netdevice: waiting for lo to become free. Usage count =
This can cause issues when trying to create net network namespace and
thus block a user from creating new containers.
See comment 16, reproducer provided at https://github.com/fho/docker-
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