From: Eric Dumazet
Date: Thu, 16 May 2019 08:09:57 -0700
> When host is under high stress, it is very possible thread
> running netdev_wait_allrefs() returns from msleep(250)
> 10 seconds late.
>
> This leads to these messages in the syslog :
>
> [...] unregister_netdevice: waiting for syz_tun
When host is under high stress, it is very possible thread
running netdev_wait_allrefs() returns from msleep(250)
10 seconds late.
This leads to these messages in the syslog :
[...] unregister_netdevice: waiting for syz_tun to become free. Usage count = 0
If the device refcount is zero, the wait
