I've got this issue on
```
# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.2 LTS
Release:        20.04
Codename:       focal
# uname -a
Linux ultima 5.4.0-80-generic #90-Ubuntu SMP Fri Jul 9 22:49:44 UTC 2021 x86_64 
x86_64 x86_64 GNU/Linux
```

The message is

```
kernel:[864004.039343] unregister_netdevice: waiting for lo to become free. 
Usage count = 1
```

-- 
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https://bugs.launchpad.net/bugs/1403152

Title:
  unregister_netdevice: waiting for lo to become free. Usage count

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