[Bug 243319] Panicked laptop & local network ARP flood

[bugzilla-noreply at freebsd.org]

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

--- Comment #7 from Kyle Evans <kevans at freebsd.org> ---
(In reply to Conrad Meyer from comment #6)

Hmm... yeah, good point- I misread '18' as '16', and those are actually the two
Windows boxen on the local segment; 10.6.112.1 being the gateway for this vlan.

I'll work on another repro and see if I can't get more context. The flood seems
to just be a side-effect of whatever's cutting off the local network, rather
than the cause. This still has to be the result of something this NIC is doing
periodically -- disconnecting it immediately remedies the situation and local
connectivity is restored, and the behavior is consistent but not immediately
triggered upon panic. Nagios lets us know quickly when this laptop's taken down
the Windows machines.

This is the context leading up to that particular flood:

07:55:35.211083 STP 802.1d, Config, Flags [none], bridge-id
8070.04:c5:a4:5e:0d:80.8098, length 43
07:55:35.650045 68:1c:a2:10:41:10 (oui Unknown) > Broadcast, RRCP-0x23 query
07:55:36.650033 68:1c:a2:10:41:10 (oui Unknown) > Broadcast, RRCP-0x23 reply
07:55:37.211468 STP 802.1d, Config, Flags [none], bridge-id
8070.04:c5:a4:5e:0d:80.8098, length 43
07:55:37.650026 68:1c:a2:10:41:10 (oui Unknown) > Broadcast, RRCP-0x23 reply
07:55:38.650003 68:1c:a2:10:41:10 (oui Unknown) > Broadcast, RRCP-0x23 reply
07:55:39.186264 IP 10.6.112.1 > ospf-all.mcast.net: OSPFv2, Hello, length 56
07:55:39.209654 STP 802.1d, Config, Flags [none], bridge-id
8070.04:c5:a4:5e:0d:80.8098, length 43
07:55:39.649990 68:1c:a2:10:41:10 (oui Unknown) > Broadcast, RRCP-0x23 reply
07:55:40.649980 68:1c:a2:10:41:10 (oui Unknown) > Broadcast, RRCP-0x23 query
07:55:41.211537 STP 802.1d, Config, Flags [none], bridge-id
8070.04:c5:a4:5e:0d:80.8098, length 43
07:55:41.649960 68:1c:a2:10:41:10 (oui Unknown) > Broadcast, RRCP-0x23 query
07:55:42.649947 68:1c:a2:10:41:10 (oui Unknown) > Broadcast, RRCP-0x23 query
07:55:43.210181 STP 802.1d, Config, Flags [none], bridge-id
8070.04:c5:a4:5e:0d:80.8098, length 43
07:55:43.649929 68:1c:a2:10:41:10 (oui Unknown) > Broadcast, RRCP-0x23 query
07:55:44.649936 68:1c:a2:10:41:10 (oui Unknown) > Broadcast, RRCP-0x23 query
07:55:45.208168 STP 802.1d, Config, Flags [none], bridge-id
8070.04:c5:a4:5e:0d:80.8098, length 43
07:55:45.649903 68:1c:a2:10:41:10 (oui Unknown) > Broadcast, RRCP-0x23 query
07:55:46.649907 68:1c:a2:10:41:10 (oui Unknown) > Broadcast, RRCP-0x23 query
07:55:47.229691 STP 802.1d, Config, Flags [none], bridge-id
8070.04:c5:a4:5e:0d:80.8098, length 43
07:55:47.649898 68:1c:a2:10:41:10 (oui Unknown) > Broadcast, RRCP-0x23 query
07:55:48.216500 IP 10.6.112.1 > ospf-all.mcast.net: OSPFv2, Hello, length 56
07:55:48.649860 68:1c:a2:10:41:10 (oui Unknown) > Broadcast, RRCP-0x23 reply
07:55:49.255548 STP 802.1d, Config, Flags [none], bridge-id
8070.04:c5:a4:5e:0d:80.8098, length 43
07:55:49.649850 68:1c:a2:10:41:10 (oui Unknown) > Broadcast, RRCP-0x23 reply
07:55:50.649836 68:1c:a2:10:41:10 (oui Unknown) > Broadcast, RRCP-0x23 reply
07:55:51.227859 STP 802.1d, Config, Flags [none], bridge-id
8070.04:c5:a4:5e:0d:80.8098, length 43
07:55:51.649821 68:1c:a2:10:41:10 (oui Unknown) > Broadcast, RRCP-0x23 reply
07:55:52.649815 68:1c:a2:10:41:10 (oui Unknown) > Broadcast, RRCP-0x23 reply

68:1c:a2:10:41:10 is the unmanaged switch immediately upstream from the laptop.
That unmanaged switch currently has yet another unmanaged switch of the same
model upstream from it that I had setup ~5 months ago to try and isolate the
problem, as this has been ongoing and consistent over the last 6+ months at
least (I don't panic it that frequently). Immediately upstream from that one is
a managed switch. The Windows boxen lay on the most-upstream switch, while this
laptop and another FreeBSD laptop are on the lowest switch.

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