I still do not have a clear reproducer, but for what it's worth I think using google chrome seem to trigger it more than other things. Today on wayland I had this fault mai 28 18:33:42 haldis kernel: nouveau 0000:01:00.0: gr: TRAP ch 10 [007f5ef000 Xwayland[3878]] mai 28 18:33:42 haldis kernel: nouveau 0000:01:00.0: gr: GPC0/TPC0/MP trap: global 00000004 [MULTIPLE_WARP_ERRORS] warp 3b000d [GPR_OUT_OF_BOUNDS] - This was not fatal, and restarting google-chrome went ok. This is with bjolie@haldis:~> uname -r 4.6.0-4.g2a4d959-default ---- Note that I've removed xf86-nouveau/nv drivers, so when logged in on gnome on xorg I'm now using the modesetting driver. Crashes seem fewer, but they do still happen.