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    SubjectRe: 2.6.19 file content corruption on ext3
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    On Mon, 2006-12-18 at 17:21 -0800, Andrew Morton wrote:
    > 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.

    if I do a sync and echo 1 > /proc/sys/vm/drop_caches does the reboot is
    still necesary ?

    >
    > 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?

    I boot linux, I start rtorrent and start the download, while it's
    downloading I start evolution and i check my mail(my mbox is very large,
    several hundered megabytes), I close evolution(I use evolution just to
    have another application witch uses the filesystem and the memory), I
    start evolution again. I start firefox. The download is complete.
    Rtorrent says if the hash is good or not. I do a "unrar t qwe.rar" to
    test that all 84 downloaded rar files are ok and see the result.

    >
    > 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.

    I will test.

    >
    > Thanks.

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