https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209428

--- Comment #15 from Roman Bogorodskiy <no...@freebsd.org> ---
(In reply to Roman Bogorodskiy from comment #14)

With some debug logging it looks like this (printf's + dmesg):

load: loaded = 0

load: loaded = 1
vtnet0: <VirtIO Networking Adapter> on virtio_pci0
vtnet0: Ethernet address: 52:54:00:f5:03:43
vtnet0: link state changed to UP

quiesce: loaded = 2

quiesce: loaded = 2

quiesce: loaded = 2

quiesce: loaded = 2
vtnet0: default vnet
vtnet0: link state changed to DOWN
vtnet0: 
detached

unload: loaded = 1

unload: uma_zdestroy

unload: loaded = 0

("load" logs are printed _before_ changing value of 'loaded', "unload" are
printed _after_).

There were a couple "Device busy" statues on unload before it succeeded.

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