[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 #8 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Right you are! Method = 0x40. Which doesn't correspond to a valid subchan
method. But in that case, I'd expect to see a INVALID_MTHD on the next word --
the command itself is still valid. (Just looking at the pseudo-code at
https://github.com/envytools/envytools/blob/master/hwdocs/fifo/dma-pusher.rst
-- perhaps it's inaccurate.)

So... the mystery is where does this 0x40 method come from. There are a lot of
potential culprites. Given that it's happening both to X and to some non-X
process that just uses mesa, I'm going to place the blame on libdrm or the
kernel... but that seems a bit far-fetched too. Dunno.

As for the memory management issues, of course, anything is possible. But it
shouldn't happen :)

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