[Bug 254303] Fatal trap 12: page fault while in kernel mode ((frr 7.5_1 + Freebsd 13 Beta3) zebra crashes server when routes are populated)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254303

--- Comment #19 from Alexander V. Chernikov <melifaro at FreeBSD.org> ---
So, it looks like it is a combination of 3 bugs:

The actual thing corrupting memory is
https://cgit.freebsd.org/src/commit/?id=42f997d9b721ce5b64c37958f21fa81630f5a224
(in 13.0-RC4).

We get to this codepath by having 127 hexthop groups (number when we trigger
array resize). This is addressed in
https://cgit.freebsd.org/src/commit/?id=9095dc7da4cf0c484fb1160b2180b7329b09b107
(only in HEAD atm).

We get that amount of nexthop groups (should be only one) because of
non-zeroing all of the memory in the comparison part of nexthop group. This is
address in
https://cgit.freebsd.org/src/commit/?id=823a80f4f9037b6b9611aaceb21f53115d1e64f1
(in 13-S, not sure if it lands in 13.0-R).

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