[Bug 94829] X crash when starting minetest with compositing and DRI3 PRIME

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94829

--- Comment #33 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Christoph Haag from comment #32)
> Created attachment 122780 [details]
> gdb backtrace
>
> But now (?) sometimes X crashes. The annoying thing is that it seems to
> crash less and less the more debug info is in xf86-video-intel and yet even
> less when X is run under gdb. After trying to start the talos principle many
> times I did manage to reproduce it with full debug, so the xorg log is
> unfortunately a bit larger:
> http://haagch.frickel.club/files/Xorg.1.log.talosvk.xz

Gotcha. It is a kind-off related problem, as it was part of the fallout from
the 1.18.2 fixes.

commit 74b755fe0a786d330d121c435d274e2418003581
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Apr 6 22:50:28 2016 +0100

    sna/present: Clear flags on the vblank event's CRTC early

    We store a flag on the vblank's CRTC to indicate whether we have marked
    the target CRTC as having an immediately pending vblank. We should clear
    this set of flags early so that we don't have to worry about the flag
    whilst processing the vblank, and so that we don't get confused if we
    have to requeue the vblank.

    Reported-by: Christoph Haag <haagch at frickel.club>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94829#c32
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

> 
> Is this a possibly related problem?
> 
> When trying to start the talos principle with Vulkan on my ivy bridge GPU
> here the game fails and logs this error:
> ERR:  Cannot set requested display mode 1920x1080: GfxAPI error: 
> ERR:  Vulkan error: Cannot obtain 'vkCmdCopyQueryPoolResults()' device
> function
> and everything was usually fine.
> 

Not sure.

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