Can also confirm that downgrading the package solves the issue.
Also found a way to reproduce the bug (on a Lenovo T420s):
1. Boot, set the cursor to an empty space on the desktop
2. Quickly toggle the touchpad enable/disable button (Fn+F8) while
simultaneously tapping the touchpad
3. The bug will be triggered after about 30-40 taps/toggles
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which is subscribed to xserver-xorg-input-synaptics in Ubuntu.
https://bugs.launchpad.net/bugs/956071
Title:
Xorg crashed with SIGSEGV in XIGetDeviceProperty()
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