https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197882

--- Comment #1 from Andrey V. Elsukov <[email protected]> ---
Created attachment 153282
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=153282&action=edit
test program to reproduce

This program works on 10-STABLE, but on 11-CURRENT it triggers the panic.
To reproduce you need ethernet interface with enabled IPv6 and MTU less that
2000:

em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
   
options=4219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_MAGIC,VLAN_HWTSO>
    ether 00:22:4d:6a:5e:b9
    inet6 fe80::222:4dff:fe6a:5eb9%em0 prefixlen 64 scopeid 0x1 
    nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
    media: Ethernet autoselect (1000baseT <full-duplex>)
    status: active

% ./test fe80::1%em0

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