dri, nouveau: BUG: KASAN: use-after-free in dma_fence_signal_timestamp_locked+0x399/0x430

[Mike Galbraith]

On Sat, 2021-08-28 at 11:38 +0200, Mike Galbraith wrote:
> Enabling kasan or kcsan in my GTX-980 equipped box will in fairly short
> order...

Correction: kasan does NOT reproduce on demand.  My bottom line remains
the same though, before enabling, either fix it, or evict it, lest it
take testing center stage ala "Hey, over here, me me fix me" :)

	-Mike