The software described in this documentation is either in Extended Support or Sustaining Support. See https://www.oracle.com/us/support/library/enterprise-linux-support-policies-069172.pdf for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.

2.2.29 Oracle VM 3.3.1 32-bit Guests with UEK R2 Panic

A panic can occur in 32-bit guests with UEK R2 on Oracle VM 3.3.1. (Bug ID 20057995)