OMFG, I've found out what triggers this. It's not randomly opening and
closing the image several times. It's when I accidentally hit the
spacebar, which in ImageViewer is stupidly used as a keyboard shortcut
for loading the next image in the folder, which happens to be a huge svg
file of several GB.

So the issue happens to be the combination of two issues:
- (the huge one) when attempting to load a file too large to be manageable, 
instead of issuing an error message or warning, eog tries to load it and eat up 
as much memory as required, hanging the whole OS
- (a small one) image viewer uses a ridiculous shortcut for "next" which is the 
space bar (I wonder what's the shortcut for "previous") which is unexpected, 
counterintuitive, and in contrast with prevailing conventions in other similar 
software.

I'll file these as separate bugs and close this one.

** Changed in: eog (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1328655

Title:
  image viewer suddenly and randomly becomes unresponsive when viewing
  big image and hangs the whole system - only option hard shut down

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