I've had various kernel panics since Yosemite....caused by (seem to be) things such as Thunderbolt Raid, Ethernet, Sleep Wake and Raid...I wonder if I need a new machine, or to take the Macbook Pro in for service. Eventually, Apple issued an OS revision and the problem goes away (until a future OS update). It is unfortunate that it is hard to tell where the problem lies unless apple admts it.