https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205194

--- Comment #1 from Kristof Provost <k...@freebsd.org> ---
I've had a quick look at this, and imagine my surprise when it turned out to
not actually be a PF bug.

Briefly, the pfsync interface doesn't have any ip6 data associated with it,
while the netinet6 code assumes it to be present.
We panic because of the call to nd6_setmtu(ifp); in the SIOCSIFMTU ioctl()
handler.

We just need to check if ip6 is active on the interface before we try to do
anything with it.

There's an open review in: https://reviews.freebsd.org/D4522

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