• affects VPP vhostuser tests

    - not VIRL server load related, as happens even under moderate load;

• does not happen on nested VM-Ubuntu16.04;

• likely due to Centos7 Qemu version

    - qemu-kvm.x86_64 10:1.5.3-126.el7_3.6

     - Ubuntu qemu version

        -  qemu-kvm 1:2.5+dfsg-5ubuntu10.14

• possibly applicable Qemu bug references

        - https://bugs.centos.org/view.php?id=12671

        - https://bugzilla.redhat.com/show_bug.cgi?id=1360137

• requires more t/shooting to find the root cause and fix

https://lists.fd.io/pipermail/csit-dev/2017-June/002036.html