[Bug 56608] xorg-server-1.13.0: core dump on regen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=56608

--- Comment #43 from Chris Wilson <chris at chris-wilson.co.uk> ---
 > I don't poke around in X server code for quite a few years. Last time it was
> on xfree86 on an i486, so please enlight me: is Xorg (or xf86-video-intel
> driver) multi-threaded these days? Because this behavior seems consistent
> with multiple threads loosing sync.

There are the occasional use of threads, but the phase you are in is explicitly
single-threaded (teardown/setup). Yes, the symptoms would appear to be the same
as in both cases we are chasing stale pointers.

Another theory to test:

commit 904af323914e05830f17621a78b6e55b371ae5fc
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Mar 1 15:34:45 2013 +0000

    sna: Assert that we do not resurrect stale pixmap across a server regen

    References: https://bugs.freedesktop.org/show_bug.cgi?id=56608

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