I've just built a new kernel, based on a cvsup at 2030 UTC on 6 May,
and since then *some* Ethernet transactions don't work.  I've checked
that it's not just a dead card: the previous kernel works fine.  I
have the funny situation that I can send fine, and I can traceroute to
the box, but I can't ping.  NFS also objects strenuously:

18:36:47.508811 panic.lemis.com > freebie.lemis.com: icmp: echo request
18:36:47.508946 freebie.lemis.com > panic.lemis.com: icmp: echo reply
18:36:48.512540 panic.lemis.com > freebie.lemis.com: icmp: echo request
18:36:48.512669 freebie.lemis.com > panic.lemis.com: icmp: echo reply
18:36:49.522568 panic.lemis.com > freebie.lemis.com: icmp: echo request
18:36:49.522691 freebie.lemis.com > panic.lemis.com: icmp: echo reply
18:36:50.532531 panic.lemis.com > freebie.lemis.com: icmp: echo request
18:36:50.532664 freebie.lemis.com > panic.lemis.com: icmp: echo reply
18:36:51.542504 panic.lemis.com > freebie.lemis.com: icmp: echo request
18:36:51.542636 freebie.lemis.com > panic.lemis.com: icmp: echo reply

The above all looks good, but panic doesn't see the reply.

18:36:58.933420 freebie.lemis.com > panic.lemis.com: icmp: echo request
18:36:59.953879 freebie.lemis.com > panic.lemis.com: icmp: echo request
18:37:00.973929 freebie.lemis.com > panic.lemis.com: icmp: echo request
18:37:01.993996 freebie.lemis.com > panic.lemis.com: icmp: echo request
18:37:03.014053 freebie.lemis.com > panic.lemis.com: icmp: echo request
18:37:04.034119 freebie.lemis.com > panic.lemis.com: icmp: echo request

panic seems to see nothing.

18:37:07.857977 freebie.lemis.com.57058 > panic.lemis.com.33435:  udp 12 [ttl 1]
18:37:07.858318 panic.lemis.com > freebie.lemis.com: icmp: panic.lemis.com udp port 
33435 unreachable
18:37:07.860258 freebie.lemis.com.57058 > panic.lemis.com.33436:  udp 12 [ttl 1]
18:37:07.860584 panic.lemis.com > freebie.lemis.com: icmp: panic.lemis.com udp port 
33436 unreachable
18:37:07.861455 freebie.lemis.com.57058 > panic.lemis.com.33437:  udp 12 [ttl 1]
18:37:07.861767 panic.lemis.com > freebie.lemis.com: icmp: panic.lemis.com udp port 
33437 unreachable

This works fine!  With the same kernel.

After rebooting a kernel of a few days ago, panic can ping just fine:

18:39:17.258545 arp who-has panic.lemis.com tell panic.lemis.com
18:39:22.034446 arp who-has freebie.lemis.com tell panic.lemis.com
18:39:22.034543 arp reply freebie.lemis.com is-at 0:80:ad:b7:c9:c7
18:39:22.034875 panic.lemis.com > freebie.lemis.com: icmp: echo request
18:39:22.034994 freebie.lemis.com > panic.lemis.com: icmp: echo reply
18:39:23.040705 panic.lemis.com > freebie.lemis.com: icmp: echo request
18:39:23.040837 freebie.lemis.com > panic.lemis.com: icmp: echo reply
18:39:24.050692 panic.lemis.com > freebie.lemis.com: icmp: echo request
18:39:24.050815 freebie.lemis.com > panic.lemis.com: icmp: echo reply

This is a Compex PCI-based NE2000 lookalike.  It's on irq 3 (alone).

Who gets the pointy hat?

Greg
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