[Bug 268400] Page fault kernel panic with KTLS enabled

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 06 Mar 2023 14:54:51 UTC

--- Comment #3 from Daniel Ponte <amigan@gmail.com> ---
My interface configuration and pf policy are rather large and complex and it
would take some time to sanitize them. Could I send directly to someone?

That said, I can confirm this is still happening in 13.2-STABLE FreeBSD
13.2-STABLE #17 stable/13-n254582-c0e7e1848360: Thu Feb 16 15:19:52 EST 2023.

Digging deeper, the panic appears to be caused by a pf rule with
route-to/reply-to rerouting to an IPv6 gif(4) interface with MTU of only 1280.
It is caused by KTLS trying to send a packet that gets rerouted by pf (likely
by reply-to) that results in ICMPv6 type 2 (Packet Too Big).

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