[libvirt] BUG: attaching - detaching network device only works 7 times

Stefan Berger stefanb at us.ibm.com
Thu Apr 15 17:00:08 UTC 2010


"Daniel P. Berrange" <berrange at redhat.com> wrote on 04/15/2010 12:48:59 
PM:

> Please respond to "Daniel P. Berrange"
> 
> On Thu, Apr 15, 2010 at 12:19:48PM -0400, Stefan Berger wrote:
> > "Daniel P. Berrange" <berrange at redhat.com> wrote on 04/15/2010 
07:50:51 
> > AM:
> > 
> > 
> > > 
> > > 
> > > Even if that wasn't broken though, I don't see how NIC hotplug would 

> > work
> > > in your scenario. That error message about Too Many NICs is becuase 
the
> > > 'nd_table' in QEMU's net.c has all fields set 'used = 1'. I don't 
see 
> > any
> > > code which ever sets 'used = 0'.
> > 
> > no code there that ever decreases nb_nic, so unplug doesn't seem to be 

> > supported
> > 
> > Would it be worth having such a simple test in libvirt repository 
itself 
> > or is that a case for the TCK project?
> 
> Yep, this is perfect candidate for a TCK test case. Take the 
210-nic-hotplug.t
> test case, and make it attempt to plug+unplug a NIC 35 times in a row. 
This
> should test this particular bug, and also validate that PCI addresses 
are
> being reused correctly (there're only 31 pci slots that can be used at 
any
> 1 time)

another idea ... how about a daily 'weather report' from the Tck test 
suite sent to the mailing list?

   Stefan
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