[Bug 71415] Xorg SIGSEGV in sna_do_copy() for 2.99.905

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71415

--- Comment #12 from Chris Wilson <chris at chris-wilson.co.uk> ---
Hmm gc->funcs is also 0 which is bad and also seemingly impossible. Ok, this is
starting to look clearly like sna_gc_move_to_gpu() is being called to restore a
sna_gc_move_to_cpu() that never occurred.

I think the relevant fix is

commit d41f847c75c3bce85fda6e7508995b45679944e8
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sat Nov 2 21:01:26 2013 +0000

    sna: Jump to the right escape target when bypassing a self-copy

    Another fix for

    commit e3f15cbf39696edae9f716bdcfbb7032ec7d7e3f [2.99.905]
    Author: Chris Wilson <chris at chris-wilson.co.uk>
    Date:   Tue Oct 22 15:19:15 2013 +0100

        sna: Move gc back to GPU after failure to move it to CPU

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