cache aliasing in dup_mmap

[Steven Walter]

On Mon, Nov 16, 2009 at 11:30 AM, Russell King - ARM Linux
<linux at arm.linux.org.uk> wrote:
>> I apologize for the late reply.  I have a build with your patches
>> running in a reboot loop (the easiest way for us to reproduce the
>> crash).  I should have a good indication of whether the patches fix
>> the issue by Monday.
>
> Any results?

Yes, SIGSEGV after 88 boots, with a crash that we previously
identified as caused by this cache corruption issue.  Attached are the
patches I used, as manually backported to 2.6.18.5.  Stock 2.6.18.5
would reliably crash in under 1000 reboots, whereas  with my ad-hoc
fix (also attached) we were able to run 8000 reboots before we ended
the test.
-- 
-Steven Walter <stevenrwalter at gmail.com>
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