Re: Odd uuid-ossp behavior on smew and shearwater

On Thu, May 29, 2014 at 4:06 PM, Andrew Dunstan <andrew@dunslane.net> wrote:
> On 05/29/2014 02:38 PM, Tom Lane wrote:
>> Josh Kupershmidt <schmiddy@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:0dropped:0 overruns:0 frame:0         TX packets:1488401 errors:0 dropped:0 overruns:0 carrier:0
collisions:0txqueuelen: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