[Bug 84653] xorg segfault when disabling and reenabling kwin compositing with dri2 gpu offloading

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84653

--- Comment #5 from Chris Wilson <chris at chris-wilson.co.uk> ---
Hmm, still haven't spotted why we end up with a GPU bo. I think it is because
the CRTC is redirected to the slave pixmap, but that slave pixmap is never
exported (and so its GPU bo is not pinned and gets removed).

The crash should be fixed with

commit e50e1bb3fd2fd20cce580841b20a3e47c7111ee9
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sun Oct 5 08:12:52 2014 +0100

    sna: Only use copy redisplay fast path if we have a source GPU bo

    Odd as it may seem, but we can end up attempting to copy from a source
    CRTC pixmap that is not on the GPU. Here we need to use the heavyweight
    path to handle its composition normally.

    Reported-by: Christoph Haag <haagch at frickel.club>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=84653
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

but I still wonder if there is another bug at play here.

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