Looks like a USB driver network device ref count bug.

Begin forwarded message:

Date: Wed, 21 Apr 2021 08:39:38 +0000
From: bugzilla-daemon@bugzilla.kernel.org
To: stephen@networkplumber.org
Subject: [Bug 212741] New: unregister_netdevice: waiting for enp0s20f0u1 to become free.


https://bugzilla.kernel.org/show_bug.cgi?id=212741

            Bug ID: 212741
           Summary: unregister_netdevice: waiting for enp0s20f0u1 to
                    become free.
           Product: Networking
           Version: 2.5
    Kernel Version: 5.11.14
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
          Assignee: stephen@networkplumber.org
          Reporter: dexter+kernelbugzilla@beetjevreemd.nl
        Regression: No

This problem exists for years by now, I could work around it until now.
Somewhere around kernel 4.9 ish this problem started to appear.

I have an USB network adapter and whenever the connection is severed (because I
touch the cable, USB reset, sleep, cosmic rays) the kernel starts logging below
message every 10~ish seconds. The usagecount is always different, but increases
with uptime. I can replicate this on all my laptops and workstations.

My setup is quite straigtforward, just (networkmanager)DHCP and a wireguard
VPN. Running Fedora 33 (but exists since like 26 or so).


[  992.787930] unregister_netdevice: waiting for enp0s20f0u1 to become free.
Usage count = 8113

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