Memory corruption starting in i915 code, in 3.2-rc5

[Keith Packard]

On Sun, 11 Dec 2011 13:36:30 -0500, Alex Villacís Lasso <a_villacis at palosanto.com> wrote:
> My system is a Fedora 16 x86_64 running self-compiled vanilla kernel 
> (.config attached for -rc5). I am getting an apparent memory corruption 
> that starts since linux 3.2-rc5. No such corruption was noticed in 
> 3.2-rc4. On the first instance, I eventually got a NULL pointer 
> dereference and the screen went black, the keyboard was unresponsive, 
> and I had to hard-reboot the machine. On the second instance, I managed 
> to reboot the machine normally. The full message log is attached. An 
> extract of the first WARNING:

The only patch in the i915 code between rc4 and rc5 is a tiny VT-d
workaround fix for ILK machines, which does fiddle with how the request
linked lists are managed.

Can you try reverting eb1711bb94991e93669c5a1b5f84f11be2d51ea1 and see
if your problem goes away?

-- 
keith.packard at intel.com
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