The FreeBSD x86_64 freeze on kernel boot (it doesn't matter whether ISO or template/HDD is used as a source).
The reason for this are the recent CPUs.
Please, note that you will not be able to run FreeBSD guests on RHEL/CentOS 6.x KVM hypervisors with the following CPUs:
- Intel(R) Xeon(R) CPU E5-2620 v2
- Intel(R) Xeon(R) CPU E5-2630 v2
- Intel(R) Xeon(R) CPU E5-2630L v2
The list isn't complete and may be updated along the process of investigation.
The issue, most probably, exists both on static and CloudBoot hosts, since no static hypervisor with problem CPUs were observed.
Unfortunately, we cannot provide the solution, since the issue is not OnApp-related.