What kernel you had previously?
do a google search with the keyword "panic+0xa7/0x16f", there are lots of issue reported, so it is a good move to continue with a newer kernel.
Also take a look at my blog post, it may be related with selinux..
http://ermanarslan.blogspot.com.tr/2014/03/linux-rhel-6-panics-on-boot-selinux.htmlLook, the same is reported for Centos also..
http://ares.gobien.be:8080/2015/01/centos-6-kernel-panic-selinux-config-file-error/