If it is repeatable for a particular book, open a bug report and attach the book and I will take a look -- although it will be a little while before I can, as I am busy working on calibre 3 right now.
You can also get a backtrace for the crash. The details depend on the distro, but for systemd based distros
echo 'bt\n' | coredumpctl gdb
should be all that needed (after installing gdb)
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