Windows VMs running on a RHEV host freeze with "virtio_ioport_write unexpected address 0x13" error in qemu log

Solution Unverified - Updated -


  • During a load test on a RHEL-based RHEV host, the Windows virtual machines appeared to freeze with an error message in the /var/log/libvirt/qemu/guestName.log (where guestName is the name of the Virtual Machine shown in the RHEV Admin Portal). The error message is:

    virtio_ioport_write: unexpected address 0x13 value 0x0


  • Red Hat Enterprise Virtualization (RHEV) 3.1
  • Guest: Windows 7

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Using a Red Hat product through a public cloud?

How to access this content