Re: vif script interpreter issues

[David Hopper <dhop%nwlink.com@localhost>]

On Mar 16, 2011, at 2:54 PM, Jean-Yves Migeon wrote:

> On 16.03.2011 18:13, David Hopper wrote:
>> 
>> I was getting these in the logs:
>> 
>> /var/log/messages: xvif3.0: Ethernet address 00:16:3e:55:39:85 
>> sysctl_createv: sysctl_create(xvif3.0) returned 22 xvif3.0: could not
>> attach sysctl nodes
> 
> Strange. If it failed creating the xvifx.y interfaces, these messages
> would never appear in console (or logs). Are you sure that the
> interfaces were not rather present, but improperly configured?

It's possible, but I couldn't get them to show up via ifconfig or netstat or 
any other utility, and xm network-attach would hang the domU hard (requiring an 
xm destroy or it would alarm out after a while), even with a simple "vif = [ '' 
]".

>> Very curious.  I wish I had run /bin/sh -ex to see what was failing
>> prior to using bash, but it all works now.
> 
> Xenstore gets populated by the PV backend driver (via xenbus(4)), the
> shell scripts are called later in the process, after xennet(4)/xvif(4)
> devices are created.
> If the interfaces are missing, something goes wrong early in the
> backend, but "what" is unknown. Especially if the sysctl warnings
> appeared, but interfaces did not show up with ifconfig -a.
> 
> If this happens again, don't hesitate to send me a mail, and I'll try to
> reproduce this bug.

Thanks!  I wonder if it's not xenbus / xenwatch that is the problem.  I've seen 
example process stacks that list these, but I don't have [xenbus] or [xenwatch] 
running at all; could that be an issue?  (I don't think that would explain why 
bash made everything better, though)

-bash-4.1$ ps ax | grep 'xen'
 265 ?      I    0:00.14 xenstored --pid-file /var/run/xenstore.pid 
 267 ?      I    0:00.00 /usr/pkg/bin/python2.6 /usr/pkg/sbin/xend start 
 269 ?      Il   0:01.68 /usr/pkg/bin/python2.6 /usr/pkg/sbin/xend start 
 271 ?      Sl   0:00.20 xenconsoled  
 286 ?      Isl  0:00.00 /usr/pkg/sbin/xenbackendd -d 
 648 ttyp0  Sl+  0:00.24 /usr/pkg/bin/xenconsole 1 
 457 ttyp2  S+   0:00.00 grep xen 

> -- 
> Jean-Yves Migeon
> jeanyves.migeon%free.fr@localhost

David