You may remember my previous post about NVidia's (then) latest drivers have some issues; in particular, the leaking of kernel-space objects being the most serious.
Since then, I'd upgraded to 91.47 to no avail, but today I upgraded to 93.71 and it is no longer leaking them!
Start NVidia control panel:
lkd> !object fffffadfb4fbc060
Object: fffffadfb4fbc060 Type: (fffffadfb5ab86c0) Process
ObjectHeader: fffffadfb4fbc030
HandleCount: 2 PointerCount: 87
Close it again:
lkd> !object fffffadfb4fbc060
fffffadfb4fbc060: Not a valid object (ObjectType invalid)
W00t.