[Bug 73351] xf86-video-intel-2.99.907 segfaults while the machine is unattended

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73351

--- Comment #15 from Chris Wilson <chris at chris-wilson.co.uk> ---
Interesting... Should have asked for p *pixmap as well :|

Afaics, there are two possibilities here. Either some memory corruption
surgically cleared out parts of *priv, or pixmap->devPrivate.ptr has been
erroneously set somewhere. Both should be impossible.

To be sure I've added some more asserts in

commit 40beee995e71b1fa4cd146a986f53e03595a4378
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Jan 15 10:07:32 2014 +0000

    sna: Add some more paranoia around dangling pointers

    References: https://bugs.freedesktop.org/show_bug.cgi?id=73351
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

please do keep on running with ./configure --enable-debug and keep gdb handy.

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