[Xen-devel] Possible bug with two networks (broken network after 16th VIF)

[Stefan de Konink <skinkie@xxxxxxxxx>]

Hi,


Last days I have noticed my DomU's broke semi-randomly, I was able to 
trace this to the following. In my state file I still had an 'network', 
a thing that wasn't used.
The first 15 VIFs were all added to xenbr0. The 16th ended up the 'next' 
bridge.
xen01 cgi-bin # brctl show
bridge name     bridge id               STP enabled     interfaces
klant1_network          8000.feffffffffff       no              vif16.0
xenbr0          8000.0019b9ebd3f6       no              peth1
                                                        vif1.0
                                                        vif2.0
                                                        vif3.0
                                                        vif4.0
                                                        vif5.0
                                                        vif6.0
                                                        vif7.0
                                                        vif8.0
                                                        vif9.0
                                                        vif10.0
                                                        vif11.0
                                                        vif12.0
                                                        vif13.0
                                                        vif14.0
                                                        vif15.0

After manually removing this 'bridge' from the statefile it looks:


xen01 cgi-bin # brctl show
bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.0019b9ebd3f6       no              peth1
                                                        vif1.0
                                                        vif2.0
                                                        vif3.0
                                                        vif4.0
                                                        vif5.0
                                                        vif6.0
                                                        vif7.0
                                                        vif8.0
                                                        vif9.0
                                                        vif10.0
                                                        vif11.0
                                                        vif12.0
                                                        vif13.0
                                                        vif14.0
                                                        vif15.0
                                                        vif16.0


I suspect something is overflowing. For me it works now, but it might 
worth to investigate this behavior.
In any case; after the 16th device the computer doesn't want to reboot, 
and I see udev issues with vif-bridge / xen-hotplug-cleanup abnormal exit.

The system hangs on remounting remaining filesystems readonly.



Stefan

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