[Bug 93720] Random crashes on (EE) TouchListenerGone: couldn't allocate events

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93720

--- Comment #6 from Chris Wilson <chris at chris-wilson.co.uk> ---
Hmm, a damage allocation failed and subsequent NULL dereference. Looks like it
was marked as "all-damaged" so it would have worked fairly normally - just
should have failed to do partial migrations.

commit 21fa92a9ba254527a8661ddde837c7a4c5ff5493
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Jan 25 15:37:01 2016 +0000

    sna/damage: Prevent freeing a NULL damage marked as all-damage

    After an allocation failure, we may mark a NULL damage pointer as being
    all-damaged. This works on the whole as most places we only ask whether it
    is all or not damaged, and if we do a partial fallback we should just
    then migrate the whole pixmap. However, we tried to destroy the NULL
    damage pointer, and crashed.

    Reported-by: Franck Delache <franck.delache at grassvalley.com>
    References: https://bugs.freedesktop.org/show_bug.cgi?id=93720
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

That should prevent this specific crash.

So given the exorbitant number of objects for Xorg - we definitely have a leak
somewhere along the driver stack. Next question, what does xrestop report after
a high uptime?

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