[Bug 220273] netgraph with Raspberry PI 3 panic on close

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220273

            Bug ID: 220273
           Summary: netgraph with Raspberry PI 3 panic on close
           Product: Base System
           Version: CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: takawata at FreeBSD.org

On Raspberry PI 3, using 

% ngctl 
and 
>quit

immediately causes kernel crash.
In my environment,I cannot use DDB interactively, because I don't have serial 
cable.

But I took a crash message as an movie and investigate the place where 
stop. 
I found it stops 
ng_detach_common -> ng_socket_free_priv -> ng_rmnode_self->ng_send_fn->
ng_send_fn1->ng_snd_item->NEXT_QUEUED_ITEM_CAN_PROCEED

Any Idea? Or only for me? 
Of course, It does not happen in the PC with x64 kernel.

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