If a plain list has more than four levels, org-mode will produce latex that
crashes.  See attached.  On the other hand, html export works fine, even
for much deeper lists.

In a large org file, this export error is pretty time consuming for a naive
user (me) to isolate, so I'd like to suggest that, before crashing latexmk,
org-mode should at least print a human-readable warning -- especially since
deep list export works for other export types.

Better yet, would be deeper latex lists.  There are ways:

http://tex.stackexchange.com/questions/41408/a-five-level-deep-list