[Bug 258057] muge(4) crashes with large tx batches

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258057

--- Comment #2 from Dan Kotowski <dan.kotowski@a9development.com> ---
$ netstat -I ue0
Name    Mtu Network       Address              Ipkts Ierrs Idrop    Opkts Oerrs
 Coll
ue0    1500 <Link#2>      00:1e:c0:e1:2c:60    94112     5     0    80241     0
    0
ue0       - 192.168.1.0/2 192.168.1.99         92610     -     -    81539     -
    -
ue0       - fe80::%ue0/64 fe80::21e:c0ff:fe       18     -     -       70     -
    -
ue0       - 2001:470:e35c 2001:470:e35c:1:b      461     -     -     1301     -
    -


Before:
netstat -I ue0 -s | grep -vF $'\t0'
ip6 on ue0:
        312 total input datagrams
        4 input datagrams discarded
        312 datagrams delivered to an upper layer protocol
        186 datagrams sent from an upper layer protocol
        79 multicast datagrams received
        10 multicast datagrams sent
icmp6 on ue0:
        15 total input messages
        7 input router advertisements
        4 input neighbor solicitations
        4 input neighbor advertisements
        14 total output messages
        6 output neighbor solicitations
        4 output neighbor advertisements
        4 output MLD reports


After:
netstat -I ue0 -s | grep -vF $'\t0'
ip6 on ue0:
        1081 total input datagrams
        48 input datagrams discarded
        1081 datagrams delivered to an upper layer protocol
        1309 datagrams sent from an upper layer protocol
        662 multicast datagrams received
        489 multicast datagrams sent
icmp6 on ue0:
        77 total input messages
        40 input router advertisements
        31 input neighbor solicitations
        6 input neighbor advertisements
        536 total output messages
        501 output neighbor solicitations
        31 output neighbor advertisements
        4 output MLD reports



I didn't see anything meaningful from usbdump on ugen0.5 (parent to muge0), but
also I'm not sure I understand the output very well. @hps let me know if you
want a dump and how you'd like me to capture it.

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