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Date:      Thu, 12 May 2016 15:44:55 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-virtualization@FreeBSD.org
Subject:   [Bug 209428] if_vtnet(4) panics when doing kldunload if_vtnet
Message-ID:  <bug-209428-27103-VAMKmCibu2@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-209428-27103@https.bugs.freebsd.org/bugzilla/>
References:  <bug-209428-27103@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D209428

--- Comment #15 from Roman Bogorodskiy <novel@FreeBSD.org> ---
(In reply to Roman Bogorodskiy from comment #14)

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

load: loaded =3D 0

load: loaded =3D 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 =3D 2

quiesce: loaded =3D 2

quiesce: loaded =3D 2

quiesce: loaded =3D 2
vtnet0: default vnet
vtnet0: link state changed to DOWN
vtnet0:=20
detached

unload: loaded =3D 1

unload: uma_zdestroy

unload: loaded =3D 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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