[Bug 73528] Deferred lighting in Second Life causes system hiccups and screen flickering

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73528

--- Comment #25 from Marek Olšák <maraeo at gmail.com> ---
My explanations for this bug are:

1) CMASK allocation is wrong. We should try and overallocate it.

2) CMASK contains garbage, which can hang the hardware. Either the clear_buffer
function isn't reliable (it uses CP DMA) or CMASK was corrupted by eviction. Or
an out-of-bounds access from some other source corrupted it.

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