[Nouveau] [Bug 70390] [NV84] Repeated system crashes under graphics load, E[PFIFO] DMA_PUSHER and lots of E[PGRAPH]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70390

--- Comment #11 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Perhaps I can interest you in WARN_ON_ONCE.

Your code should cover all in-kernel cases, but doesn't being to touch the
user-submitted code. Take a look at nouveau_gem_pushbuf_validate for that -- it
presently doesn't do any actual data validation. You could also do the check in
nv50_dma_push. Basically the main ring buffer just contains pointers to
"subrings" (for your generation of card).

[As an aside, there are a few other bugs that show attachments that include the
same 0x00406040 thing... So you're not the only one seeing it.]

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