[Bug 283426] panic in sbappendaddr_locked() - if_ovpn related?

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283426

--- Comment #14 from Kristof Provost <[email protected]> ---
(In reply to Bjoern A. Zeeb from comment #12)
if_ovpn sets u_tun_func, yes, via udp_set_kernel_tunneling(): 
https://cgit.freebsd.org/src/tree/sys/net/if_ovpn.c#n635

I'm not sure how m_unshare() would feature in this, given that if it succeeds
if_ovpn keeps the packet (so we'd see a panic there if it messed up), and if it
fails we return 'true' (indicating the filter ate the packet, and no further
UDP processing happens).

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