[Bug 98855] xf86-video-intel crashes with Xorg 1.19 using I-V-O with Nvidia

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98855

--- Comment #15 from Chris Wilson <chris at chris-wilson.co.uk> ---
Took a stab at that trace:

commit ff25ad3402be3bc20f7b6e680e49ad03d7c6e2af
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Dec 5 21:28:35 2016 +0000

    sna: Reorder frontbuffer resize vs flip event queue draining

    If we are not careful, we may process an unflip in the middle of
    resizing the frontbuffer - when the ScreenPixmap state is ill-defined.
    First flush all the pending flip events, cancel any residual unflips,
    then update the screen pixmap. This should be enough to close the race.

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