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[Serge Hallyn <1353947@xxxxxxxxxxxxxxxxxx>]

Sorry, when the table only had the two entries i drew some bad
assumptions from that, and I also missed the fact that hangs were in the
host kernel.

To be clear, running qemu 1.5 on the same host kernel has no issues with
any guest, while qemu 2.0 causes host kernel to hang (indefinately) with
some guests?

Then indeed disregard my comment #5.

Is this 100% reproducible, every time?  Would you be able to bisect qemu
to figure out where the problem was introduced?

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https://bugs.launchpad.net/bugs/1353947

Title:
  Hypervisor with QEMU-2.0/libvirtd 1.2.2 stack when launching VM with
  CirrOS or Ubuntu 12.04

Status in QEMU:
  New
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  The issue observed when running an hypervisor with QEMU 2.0/libvirtd 1.2.2
  The VM network interface is attached to a PCI virtual function (SR-IOV).

  When we ran VM with guest OS CirrOS or Ubuntu 12.04 we observed an hipervisor hang shortly after the VM is loaded
  We observed the same issue with Mellanox NIC and with Intel NIC

  We’ve tried few combinations of {GuestOS}X{Hypervisor} and we got the following findings:
  When a hypervisor is running QEMU 1.5/libvirtd 1.1.1 - no issue observed
  When a hypervisor is running QEMU 2.0/libvirtd 1.2.2 - CirrOS and Ubuntu 12.04 guest OSes caused hypervisor hang
  When a hypervisor is running QEMU 2.0/libvirtd 1.2.2 - CentOS 6.4 and Ubuntu 13.10 - no issue observed

  The problematic guest OSes are with kernel versions ~3.2.y

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