Created attachment 130224 [details]
No particular pattern. Sometimes happens immediately after logging in. Sometimes happens 10 times per day, sometimes after a week of trouble-free operation. No particular application causes it.
This most recent time it happened 3 times in a row. Last was upon pressing Alt+Tab from Chrome.
Hardware is a Macbook 7,1 mid2011. Dmesg output attached.
I think you want commit f9c0715e39f09bd5ea6f6357a4ce7a969b673007, included in v4.10-rc1:
Author: Ben Skeggs <firstname.lastname@example.org>
Date: Wed May 11 16:28:30 2016 +1000
drm/nouveau/bar/nv50: fix bar2 vm size
The BAR2 page table was being made WAY too big - oops.
Signed-off-by: Ben Skeggs <email@example.com>