When running Xorg with libinput on VirtualBox, the server crashes. This behavior is not reproducible with the evdev driver, which works as expected instead.

record the virtual box input devices with evemu-describe please and attach the output here. Looks like libinput isn't happy with one of them.

Created attachment 113051 [details]
evemu-describe on Virtualbox Mouse Integration

Attached evemu-describe for the device

the quick fix for this is to run a s/malloc/zalloc/ across libinput. The longer fix is this patch series here:
http://lists.freedesktop.org/archives/wayland-devel/2015-February/019735.html

Fixed with the three patches leading up to

commit 154b3cf74941c26cdf77a24136c273ee7d9f6e65
Author: Peter Hutterer <peter.hutterer@who-t.net>
Date:   Tue Feb 3 09:37:53 2015 +1000

    Don't init pointer acceleration on absolute devices

Thanks for the quick resolution!