Created attachment 119019 [details]
Not sure if the intel warn plays into things, since it happened from an interrupt. But it was interrupting a different process. Looks like the buffer already got unmapped somehow, or we're writing too far into it.
This is with a 4.3-rcN-ish nouveau module (despite the main kernel being 4.0).
Happened when running piglit in parallel (8 threads).
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