I can reproduce the problem with the following:

1. Have the following ~/.vnc/xstartup file:

#!/bin/sh
export XKL_XMODMAP_DISABLE=1
valgrind --trace-children=yes -v unity-2d-shell &

2. Run vncserver - log file will be created in ~/.vnc. You don't have to
connect with vncviewer, it will just crash after a few seconds.

Note that I had to run it via valgrind, otherwise the stacktrace I was getting 
was completly useless. Attaching valgrind output. 
The problem appears to be in XListInputDevices returning NULL list ptr, while 
indicating positive number of devices.

** Attachment added: "valgrind output"
   
https://bugs.launchpad.net/ubuntu/+source/unity-2d/+bug/965464/+attachment/3040792/+files/pawel-VirtualBox%3A1.log

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https://bugs.launchpad.net/bugs/965464

Title:
  unity-2d-shell crashed with SIGSEGV in KeyMonitor::registerEvents()

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