What is this?!
MacBook Pro, OS X Yosemite (10.10.3), Early 2011 MacBook Pro 15 Inch 2Ghz
This is what is known as a kernel panic. Read more at OS X: When your computer spontaneously restarts or displays "Your computer restarted because of a problem." - Apple Supp…
If this is an isolated incident, ignore it. If not, log and post it per these instructions:
https://support.apple.com/en-us/HT201753
Ciao.
What is this?!