I have 16GB and when clamscan automatically kicked on (Linux anti-virus scan)
Why are you running a virus scanner on Linux?
it ran out of memory and was logging out of memory errors as fast as the hard drive could take it. The same message over and over and over and over and over and over and over and over. Took me four hours to track it down because all your programs start crashing when they can't write their little temp files and it wasn't using a lot of CPU. I didn't want to restart because I had something open I needed to save.
Ran out of memory, or ran out of storage?
Running out of actual memory is fun, too--the handful of times it's happened to me on Linux, nothing actually crashes; it just stops. I could still switch between different open windows, although the screen started painting. Could still run terminal commands but trying to tab-complete would just spit out a bash error :) Trying to recall from memory how to call up a list of processes and kill them via the terminal (because no memory to open task manager) without autocomplete was fun the first time.