[Xen-bugs] [Bug 329] New: Dom0 crashes and server reboots when booting a single VM with > 122 VIFs

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=329

           Summary: Dom0 crashes and server reboots when booting a single VM
                    with > 122 VIFs
           Product: Xen
           Version: 2.0
          Platform: x86-64
        OS/Version: Linux-2.6
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: maiden1134@xxxxxxxxx


If you create a single VM, one that has 123 VIFs (by adding 123 VIF entries in 
the VM configuration file - all VIFs go to the same bridge), Dom0 dies and the 
server reboots while XEN is trying to boot the VM.  XEN crashes at the point 
of the boot where it is trying to initialize the ethernet interface (the 
server reboots immediately).  If the VM has 122 VIFs, it boots up and works 
fine (ifconfig was used to verify the VIFs are present - all 122 are accounted 
for).
 
In addition, if you create 61 VMs, each with only 1 VIF, that works fine.  As 
soon as you try to boot the 62nd VM, the same problem occurs (crash and 
reboot).  It appears that the magic number is 123 for the # of VIFs -it also 
looks like XEN is creating a phantom VIF for each VM that is created. So in 
the case of 61 VMs with 1 VIF each, you have 122 VIFs.  As soon as you go 
above this number, XEN dies.  

This problem is easy to reproduce - it happens everytime.
 
This is occurring on Xen 2.0.6 / XenLinux 2.6.11, AMD opteron, dual processor. 
I also hit this same problem with XEN 2.0.1.

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