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    SubjectRe: ext2 FS corruption with 2.5.59.
    Oleg Drokin <> wrote:
    > Here is my version:
    > #!/bin/bash
    > mke2fs /dev/hdb2
    > mount /dev/hdb2 /mnt -t ext2
    > cd /mnt
    > /tests/fsstress -p10 -n 1000000 -d . &
    > while /tests/fsx -c 1234 -N60309 testfile ; do rm -rf testfile*; done
    > > So I'm going to have to ask you to investigate further. Does it happen on
    > > other machines? Other filesystems? Older kernels? That sort of thing.
    > Ok. I am able to reproduce that same thing on dual Pentium4 2.2GHz (HT enabled), 512M RAM.
    > My testing reveals that 2.5.50, 2.5.52 and 2.5.53 do not have the problem.
    > 2.5.54, 2.5.55, 2.5.59 have the problem.
    > ext3 and reiserfs do not show this problem.
    > Looking through 2.5.54, I found that changeset named "[PATCH] quota locking update" forwarded by you
    > is the cause for the problem.
    > (also by reviewing the changeset it became clear that in order to succesfully reproduce the
    > problem one must have CONFIG_QUOTA to be disabled).
    > This small patch below fixes the problem for me (just reverts back part of quota locking patch in fact).
    > Also I think that taking BKL just to update some inode accounting stuff is kind of expensive,
    > so certainly better solution must exist.

    aaargggggghhh. I noticed that when I was reviewing the patch, but promptly
    forgot to check it more closely.

    However, in reviewing it, I don't see exactly what's going on. Because only
    one process is accessing the stat information of the fsx inode anyway?

    Yes, we need to rub out that i_bytes/i_blocks thing, replace it with an
    atomically updated loff_t, etc. But I'd like to understand what the exact
    failure is first. It _seems_ that stat has somehow seen a >4G value of
    stat->size, but how can this happen???

    I need to breathe life back into my P4 box, see if I can get it to happen

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