[Bug 243319] Panicked laptop & local network ARP flood

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243319

            Bug ID: 243319
           Summary: Panicked laptop & local network ARP flood
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: kevans at freebsd.org

Hi,

Running on an X220 with em0 (Intel 82579LM), laptop panicking results in an
absolute flood of ARP requests:

07:55:53.025687 ARP, Request who-has 10.6.112.1 tell 10.6.112.18, length 46
07:55:53.025708 ARP, Request who-has 10.6.112.1 tell 10.6.112.16, length 46
07:55:53.025729 ARP, Request who-has 10.6.112.1 tell 10.6.112.18, length 46
07:55:53.025750 ARP, Request who-has 10.6.112.1 tell 10.6.112.16, length 46
07:55:53.025783 ARP, Request who-has 10.6.112.1 tell 10.6.112.18, length 46
07:55:53.025825 ARP, Request who-has 10.6.112.1 tell 10.6.112.16, length 46
07:55:53.025850 ARP, Request who-has 10.6.112.1 tell 10.6.112.18, length 46
07:55:53.025872 ARP, Request who-has 10.6.112.1 tell 10.6.112.16, length 46
07:55:53.025894 ARP, Request who-has 10.6.112.1 tell 10.6.112.18, length 46
07:55:53.025915 ARP, Request who-has 10.6.112.1 tell 10.6.112.16, length 46
07:55:53.025937 ARP, Request who-has 10.6.112.1 tell 10.6.112.18, length 46
07:55:53.025959 ARP, Request who-has 10.6.112.1 tell 10.6.112.16, length 46
07:55:53.025980 ARP, Request who-has 10.6.112.1 tell 10.6.112.18, length 46
07:55:53.026001 ARP, Request who-has 10.6.112.1 tell 10.6.112.16, length 46
07:55:53.026022 ARP, Request who-has 10.6.112.1 tell 10.6.112.18, length 46
07:55:53.026044 ARP, Request who-has 10.6.112.1 tell 10.6.112.16, length 46
07:55:53.026065 ARP, Request who-has 10.6.112.1 tell 10.6.112.18, length 46

root at gemini:~# tcpdump -r re0.pcap | grep -i 'arp, request' | grep '7:55:53' |
wc -l
reading from file re0.pcap, link-type EN10MB (Ethernet)
   17424

17,000 in that particular second alone; all of the boxes on the local network
segment end up with networking hosed until I reboot/remove the offending
laptop.

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