[Bug 88112] [865g 3.16 regression] Desktop image is distorted

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88112

--- Comment #21 from Chris Wilson <chris at chris-wilson.co.uk> ---
Looks like userptr is being used with ShmPixmaps, that's useful to know.

It blew up dereferencing a mmap(wc) pointer. That's new with drm-intel-nightly.
Looks like I forgot some sigtrap safe-guards.

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