I've got a bunch of example files but I'm not sure anymore which one displayed properly and which didn't, that's why I'm posting the file I gave to Sony support. It consists of three Wikipedia articles.
I loaded the file Z80.epub on the T2, which had the Firmware of December 2012 (if I remember correctly). To crash the reader
1. Open the book
2. Open the table of contents
3. Goto the chapter X86 calling conventions
Sometime it crashed immediately, sometime I had to flip one or two pages.
The problem is the
<pre>
</pre>
in the file, where the line between the two tags consists only of a single space character. I haven't checked though whether the newline is a \n or a \r\n. When I removed everything from the chapter and only left these tags it, it still crashed. I copied these lines into the first chapter, then the T2 crashed when opening the first chapter.
I did not attempt to create a minimal file from scratch. So could be there's a relationship between the stylesheet and the text.
Hope this explanation makes some thanks.