[Bug 89903] [IVB SNA] sna_dri2_reuse_buffer:370 assertion 'kgem_bo_flink(&to_sna_from_drawable(draw)->kgem, get_private(buffer)->bo) == buffer->name' failed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89903

--- Comment #9 from Chris Wilson <chris at chris-wilson.co.uk> ---
I couldn't spot any obvious reason for a stale pointer (all the unrefs cleared
the pointer). So I had to look for subtle reasons like being interrupted by a
signal at just the wrong moment:

commit be0fc3ce20fda064d68f38e24717552222d1fd74
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sun Apr 5 15:46:27 2015 +0100

    sna: Block signals while releasing cursor under modeset

    Otherwise we may process a SIGIO moving the cursor away from the CRTC
    causing us to remove the cursor and then process a stale pointer inside
    the modeset after the signal is complete.

    Reported-by: Chris Bainbrigde <chris.bainbridge at gmail.com>
    References: https://bugs.freedesktop.org/show_bug.cgi?id=89903
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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