Start enlightenment with xdebug.sh
Open some random pdf in mupdf.
Observe that the icon is not dislayed, it looks like this:
When i close the mupdf window e gets stuck in the code:
0x00007ffff79db8a8 in _cache_prune (notsci=0x0, copies_only=0 '\000') at lib/evas/common/evas_image_scalecache.c:409
the call to get the next item is always pointing to the next item itself.