Google Chrome causes system freeze

Looks like your video driver gets messed up when you scroll the webpage. You can try Using Alt+PrintScreen+"REISUB" (i.e. hold Alt+PrintScreen and press R E I S U B key sequence; B might not work, so you'll have to press reset) to safely restart the system and save the logs. Then you can examine /var/log/kern.log near end of file. There'll likely be some BUG or Oops messages indicating what's going with the driver.

Thanks for the help of @Ruslan, I located the bug is my intel i915 video driver on linux kernel 3.2.0-39. Here is some discussion on ubuntu forum.

I switched to kernel 3.2.0-37 and it works fine for me by now.