Comment 57 for bug 1021517

Can't reproduce it, what version of xserver-xorg-input-synaptics and evdev are you using?
And how exactly do you draw it, since if I use my precise and draw with touchpad, usb mouse or with synergy it's working fine.

The backtrace is useless without debug symbols, could you look at https://wiki.ubuntu.com/X/Backtracing and get a proper one?