Bug 212741

Summary: unregister_netdevice: waiting for enp0s20f0u1 to become free.
Product: Networking Reporter: Arjen Heidinga (dexter+kernelbugzilla)
Component: OtherAssignee: Stephen Hemminger (stephen)
Status: NEW ---    
Severity: normal    
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 5.11.14 Subsystem:
Regression: No Bisected commit-id:

Description Arjen Heidinga 2021-04-21 08:39:38 UTC 
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