[Bug 268400] Page fault kernel panic with KTLS enabled

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268400

Kristof Provost <kp@freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |markj@FreeBSD.org

--- Comment #6 from Kristof Provost <kp@freebsd.org> ---
It looks like this happens while we're computing the checksum for the icmp6
header, and that we're dereferencing a NULL pointer.

I'm relatively confident that we're processing an unmapped mbuf, and that's why
we're panicing here.

Mark taught in_cksum_skip() to handle those, but I think in6_cksum() doesn't
handle them. So we either need to insert an mb_unmapped_to_ext() call in
in6_cksum(), or we need to teach in6_cksum() to deal with unmapped mbufs.

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