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Date:      Mon, 17 May 2021 09:33:18 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 255882] vxlan(4): kernel panic when unloading module if vxlan interface in VNET jails not shutdown before jail shutdown
Message-ID:  <bug-255882-7501-99VhMUU2U1@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-255882-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-255882-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D255882

Aleksandr Fedorov <afedorov@FreeBSD.org> changed:

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                 CC|                            |afedorov@FreeBSD.org

--- Comment #1 from Aleksandr Fedorov <afedorov@FreeBSD.org> ---
The problem is easily reproducible:

# kldload if_vxlan
# jail -c name=3Dj1 persist vnet
# jexec j1 ifconfig vxlan create
vxlan0
# jail -r j1
# jail -c name=3Dj1 persist vnet
# jexec j1 ifconfig vxlan create
vxlan1
# jail -r j1
# kldunload if_vxlan
panic!!!

Unfortunately if_vxlan (4) does not support VNET.
There was an attempt, but not finished:
https://reviews.freebsd.org/D2868?id=3D6328#change-57yzNcgb46N6

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