[Bug 87477] [BDW Bisected]igt/gem_close_race/process-exit causes system hang with OOM Killer, when true PPGTT enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87477

Eero Tamminen <eero.t.tamminen at intel.com> changed:

           What    |Removed                     |Added
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                 CC|                            |valtteri.rantala at intel.com

--- Comment #9 from Eero Tamminen <eero.t.tamminen at intel.com> ---
(In reply to Rodrigo Vivi from comment #7)
> I couldn't reproduce on my BDW either.

We've seen this in our testing, 100% reproducible.  Seeing the OOM requires:
1. Java process mapping GBs of memory in large anonyous mappings (of which only
 few tens of MB are actually used) in total
2. Ubuntu 14.04 or 14.10 as those have version of Unity "compiz" compositor,
which leaks Windows references on every window close
3. Running SynMark GL context recreation test about dozen times after boot

Without 1), seeing the OOM kill took hundred(s) of repeats of step 3).

slabtop shows vm struct slabs growing slowly, first I thought that to be the
kernel issue, but I think compiz leak explains that.  There's something with
the graphics driver which dislikes a lot of memory being mapped while there's a
small leak for handles.

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