Dady, I crashed the kernel

So my system was fine this weekend, yet I manage to completely break it when I get a usb memory on the usb hub making the automount failed and with that the whole mounting stuff on my system.

My roomate wanted me to transform some of the files but instead it result in a total disaster when X broke then the whole computer as I send it to shut down, the monitor remained messed up (cpufreq) and when I started it, the whole mounting capabilities were a nightmare.

Root partition was read only, xfs was unable to being mounted so I didn’t had a home — again.

I decided to switch kernels to another one and that gave me errors on the X. So I wonder how the kernel could have been broken just because of a stupid USB.