On Thu, May 29, 2014 at 4:06 PM, Andrew Dunstan <and...@dunslane.net> wrote:
> On 05/29/2014 02:38 PM, Tom Lane wrote:
>> Josh Kupershmidt <schmi...@gmail.com> writes:
>> Interesting.  Looks like you have access only to virtual network
>> interfaces, and they report all-zero MAC addresses, which the UUID library
>> is smart enough to ignore.  If smew is also in a virtual environment
>> then that's probably the explanation.  (There are some other buildfarm
>> critters that are reporting MAC addresses with the local-admin bit set,
>> which I suspect also means they've got virtual network interfaces, but
>> with a different treatment of the what-to-report problem.)

> Almost all my critters run in VMs (all but jacana and bowerbird).

They're not running on OpenVZ, are they? `ifconfig` on shearwater says:

venet0    Link encap:UNSPEC  HWaddr
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:127.0.0.2  P-t-P:127.0.0.2  Bcast:0.0.0.0
Mask:255.255.255.255
          UP BROADCAST POINTOPOINT RUNNING NOARP  MTU:1500  Metric:1
          RX packets:1409294 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1488401 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:751149524 (716.3 MiB)  TX bytes:740573200 (706.2 MiB)

venet0:0  Link encap:UNSPEC  HWaddr
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:198.204.250.34  P-t-P:198.204.250.34
Bcast:0.0.0.0  Mask:255.255.255.255
          UP BROADCAST POINTOPOINT RUNNING NOARP  MTU:1500  Metric:1

and it seems this all-zeros MAC address is a common
(mis-?)configuration on OpenVZ:

https://github.com/robertdavidgraham/masscan/issues/43
http://stackoverflow.com/questions/5838225/how-do-i-get-a-default-gridgain-node-in-openvz-discover-other-nodes-on-the-same
http://forum.openvz.org/index.php?t=msg&goto=8117


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