Re: 2.6.5-rc2-aa5

[Andrew Morton]

Andrea Arcangeli <andrea@xxxxxxx> wrote:
>
> Notably there is a BUG_ON(page->mapping) triggering in
> page_remove_rmap in the pagecache case. that could be ex-pagecache being
> removed from pagecache before all ptes have been zapped, infact the
> page_remove_rmap triggers in the vmtruncate path.

Confused.  vmtruncate zaps the ptes before removing pages from pagecache,
so I'd expect a non-null ->mapping in page_remove_rmap() is a very common
thing.  truncate a file which someone has mmapped and it'll happen every
time, will it not?

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