Proper fix in attachment.

Konstantin Khlebnikov wrote:
> OGAWA Hirofumi wrote:
>> Konstantin Khlebnikov<khlebnikov@openvz.org>   writes:
>>
>>> Hmm, very interesting!
>>> Please try this patch, it must fix the problem and print some numbers to debug.
>>>
>>
>> I think the bug is in radix_tree_for_each_contig().
>>
>> radix_tree_next_slot() returns NULL if the slot was NULL (i.e. there is
>> hole). But, slot == NULL is not meaning to stop iterate here. Actually,
>> if slot is NULL, it gets next chunk.
>>
>> Bang.
>
> Yeah, you are right, I already found this too.
> Currently I think how to fix this more accurately...
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