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    SubjectRe: 2.6.19 file content corruption on ext3
    On Mon, 18 Dec 2006 16:57:30 -0800 (PST)
    Linus Torvalds <torvalds@osdl.org> wrote:

    > What happens if you only ifdef out that single thing?
    >
    > The actual page-cleaning functions make sure to only clear the TAG_DIRTY
    > bit _after_ the page has been marked for writeback. Is there some ordering
    > constraint there, perhaps?
    >
    > I'm really reaching here. I'm trying to see the pattern, and I'm not
    > seeing it. I'm asking you to test things just to get more of a feel for
    > what triggers the failure, than because I actually have any kind of idea
    > of what the heck is going on.
    >
    > Andrew, Nick, Hugh - any ideas?

    If all of test_clear_page_dirty() has been commented out then the page will
    never become clean hence will never fall out of pagecache, so unless Andrei
    is doing a reboot before checking for corruption, perhaps the underlying
    data on-disk is incorrect, but we can't see it.

    Andrei, how _are_ you running this test? What's the exact sequence of steps?

    In particular, are you doing anything which would cause the corrupted file
    to be evicted from memory, thus forcing a read from disk? Such as
    unmounting and then remounting the filesystem?

    The point of my question is to check that the data is really incorrect
    on-disk, or whether it is incorrect in pagecache.

    Also, it'd be useful if you could determine whether the bug appears with
    the ext2 filesystem: do s/ext3/ext2/ in /etc/fstab, or boot with
    rootfstype=ext2 if it's the root filesystem.

    Thanks.
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