Kernel Panic/System Restart when disconnecting thunderbolt drive

I have isolated the kernel panic to the connected thunderbolt devices. More specifically, every time I disconnect an external thunderbolt drive, there is a kernel panic and the system restarts. Any ideas?

Hardware Overview:

Model Name: Mac Pro

Model Identifier: MacPro6,1

Processor Name: 6-Core Intel Xeon E5

Processor Speed: 3.5 GHz

Number of Processors: 1

Total Number of Cores: 6

L2 Cache (per Core): 256 KB

L3 Cache: 12 MB

Memory: 32 GB

Yosemite 10.10.2