[Bug 83677] [HSW] GPU hang on ctx load

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83677

--- Comment #16 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #14)
> (In reply to comment #13)
> > I've updated the shotgun at #requests. It's been reworked quite a bit since
> > then, and I need to double check that it still applies. I think I have a
> > germ of a theory as to what is going wrong.
> 
> I'm now testing teh requests branch, as of
> 
> commit da0c726483f60d4f53de49a4a2753a1d95983bd9
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Thu Sep 18 12:54:55 2014 +0100
> 
>     Revert "drm/i915: Enable full PPGTT on gen7"
>     
>     This reverts commit 83255c23abe91da047dc71e52be62c42dd4c04a1.
> 
> This gets me a new bit of excitement - when I start X for the first time,
> the log file says:
> 
> [    72.039] (WW) xf86OpenConsole: setpgid failed: Operation not permitted
> [    72.039] (WW) xf86OpenConsole: setsid failed: Operation not permitted
> [    72.039] (EE) 
> Fatal server error:
> [    72.039] (EE) xf86OpenConsole: VT_ACTIVATE failed: Input/output error
> [    72.039] (EE) 
> [    72.039] (EE) 
> 
> which it didn't before. Second attempt to start X works fine.

Right, there is a nasty bug in the vt layer somewhere. The branch contains a
patch to return -EIO to prevent a lockup. But you should see that regardless,
just depends on kernel config.

> I also get a new message (but not reliably) in dmesg:
> 
> [  255.476493] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer
> elapsed... blitter ring idle
> 
> And I've had the machine freeze completely while restarting X11.

These two are more concerning. On HSW. Hmm.

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