Host system may panic if VM configured with a lot of memory

Issue: On RHEL6 systems, with guests configured with 2TB or more of RAM, the host my panic.

Environment:

RHEL6
Virtualization
Guests configured with greater then or equal to 2TB of memory

Diagnostics:

1. Install RHEL6.6 on a system.
2. Create a guest with 3TB memory.
3. Start the guest.

When bug presents, a traceback si...