Bug#478836: The substrate screensaver has the same problem
It looks like the "substrate" screensaver in xscreensaver has the same
problem. It runs for about 10-20 seconds and then it freezes my entire
system. At first I could go to the console with Ctrl+Alt+F1 and kill
substrate from there, but later on even that would not work. I had to raise
a bunch of skinny elephants to get my system back under control.
As the bug submitter mentioned, everything works like a charm under