[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

            Bug ID: 254303
           Summary: Fatal trap 12: page fault while in kernel mode ((frr
                    7.5_1 + Freebsd 13 Beta3) zebra crashes server when
                    routes are populated)
           Product: Base System
           Version: Unspecified
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: a.ivanov at veesp.com

Created attachment 223285
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=223285&action=edit
kgdb backtrace

Description :

FreeBSD 13 Beta 3 + Frr frr7-7.5_1

Server has 2 BGP connections with Uplink routers. Each neighbour sends FullView
ipv4 (840k+ routes) to this FreeBSD box. 
When 1 session is up - everything is ok, when we bring second connection -
server crashes (dump attached)

How to reproduce : 
1) Install FreeBSD 13 Beta 3 + Frr frr7-7.5_1
2) Send 2 x Fullview via 2 peers to FreeBSD box

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