Re: [Xen-devel] 2.6.32.27 dom0 - BUG: unable to handle kernel paging request

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

On 02/14/2011 03:52 PM, Christopher S. Aker wrote:
> On 1/31/11 5:25 PM, Jeremy Fitzhardinge wrote:
>> On 01/31/2011 01:07 PM, Christopher S. Aker wrote:
>>> Ian / Jeremy:  Where do I go from here?
>>
>> It's also not impossible this bug is related to the "get_user_pages" bug
>> that has been discussed over the last few days.  I need to think about
>> that too.
>
> How's that going?  Any epiphanies?  I've been trying to follow the
> list (and changesets) but wasn't sure if a potential fix snuck in or
> if there's something else I should be pressure cooking (an unrelated
> patch that may have the side effect of fixing my issue, for example).

No, I had a close look at it the other day and remained stumped.  It
looks like the pgd is being freed while still in use, but I couldn't see
where that could happen unprotected from the lock.  This is really
bugging me - there's something strange going on, which worries me.

    J


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