[Bug 68171] [IVB/HSW ULT]system hang when run nightly testing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68171

--- Comment #5 from Ben Widawsky <ben at bwidawsk.net> ---
This one doesn't look the same to me as the one invoked by gem_evict_everything
(and Ken just hit it too fwiw).

The cause is memory pressure and being forced to hit the bound_list while doing
execbuf. It's a similar cause to the other one, but from what I can gather this
one fails while we're trying to unmap the gtt userspace mappings. Since I do
not know much about i915_gem_release_mmap, it might take me a while to come up
with some ideas.

It is possible this is another pre-existing bug that's just uncovered by VMA.

Is that SHA the use VMAs in execbuffer commit?

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