Re: 2.4.0-test10-pre3:Oops in mm/filemap.c:filemap_write_pa

[Russell King]

Trond Myklebust writes:
> It's probably particularly nasty under NFS because of
> invalidate_inode_pages(). The latter empties the page cache whenever
> we can no longer trust it and calls remove_inode_page() on every
> unlocked page. It won't care whether the page is mmapped or not.
> 
> My guess is therefore that the line setting 'page->mapping = NULL' in
> __remove_inode_page() is a candidate for scrutiny...

Indeed.  page->mapping is set to NULL in two places, one in
__remove_inode_pages() and the other one in the swap code after we've
checked that it was NULL.  I hadn't found the particular call trace
that caused us to ended up in __remove_inode_page() though with this
page.
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