I presume that the nouveau driver is responsible for drawing the mouse pointer.
My pointer seems to be redrawn constantly producing what Windows used to call
"Tails". Multiple images of the mouse pointer. Additionally, there seems to be
some wild pointer because data from somewhere else in memory sometimes appears
with the mouse pointer.

There appears to be no messages related to this behavior in the dmesg buffer.

Occasionally I get a segfault. I have Xorg.0.log files and their corresponding
dmesg buffer files available if needed.

This is a Fedora 21 x86_64 system with a kernel at 3.18.8-201.fc21.x86_64